HOK Engineering Lookbook - S+T

hok engineering

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HOK | 2

C ONTENTS 01

HOK ENGINEERING

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PROJECTS BY MARKET TYPE Science + Technology

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HOK STREAM Science + Technology

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SERVICES AND SPECIALTIES SUSTAINABILITY

EXISTING BUILDINGS

MEP TECHNOLOGY

Energy Modeling

Adaptive Reuse

Displacement Ventilation

Whole-Building Life-Cycle Analysis Renovation

Radiant Heating & Cooling

Net Zero and LEED Platinum

Central Utility Plants

Facade Design and Analysis

SPECIALTY STRUCTURES

Enclosure Thermal Modeling

Canopies

Daylight and Glare Simulation

Pedestrian Bridges

IT INNOVATION

Feature Stairs

Passive Optical Networks

Vibration Analysis

IT Security Systems

DESIGN COMPETITIONS

Underfloor Air Systems

Circadian Facades Stadiums

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HOK ENGINEERING

#1

#1

#1

2019

A/E firm as ranked by ENR

A/E firm as ranked by Architectural Record

Green Building A/E firm as ranked by ENR

One of Fast Company’s Most Innovative Design Firms

HOK’s culture is rooted in design and technical excellence. This is where great engineering lives.

For over 50 years, we have delivered exceptional design with architects at HOK and those at other outstanding practices.

We engineer HOK’s most complex projects, from the new Terminal B at LaGuardia, the largest P3 project in US history; to KAUST, a 6.5 million square-foot LEED Platinum Lab of the Year; to the first-of-its-kind Mercedes-Benz Stadium Halo Video Board.

We thrive by finding creative, integrated solutions whether we are fine-tuning proven, cost-effective building systems, or exploring ambitious, unprecedented design.

We want to be your engineers. We want to bring our experience across the spectrum of project type and size, supplemented by next-generation computational techniques developed by our team and sustainable excellence to your project. Let us help you deliver the best for your Client.

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ENGINEERING SERVICES MECHANICAL

STRUCTURAL

• Air distribution systems - VAV, constant volume, Demand

• Blast & vibration analysis

Controlled Ventilation (DCV), displacement ventilation,

• Existing building assessments

underfloor air distribution (UFAD), dual facade

• Foundation design

• Building automation systems-Integrated smart building systems

• Linear and non-linear dynamic analysis • Long-span & special structures

• Central utility plants

• Renovation & retrofit design

• Cooling condensate recovery systems

• Resilience based design

• Energy recovery systems - Air, Water and Steam

• Seismic design

• Fuel-oil systems-above and below ground with

• Structural modeling

containment

• Technical planning & conceptual studies

• Geothermal systems and ground source heat pumps • Heating, ventilation, and air conditioning

ELECTRICAL

• Hydronic distribution systems-building and campus;

• Emergency/Standby generator systems

variable primary or primary/secondary/tertiary

• Energy management and conservation analysis

• Natural ventilation design

• Fire alarm and smoke detection systems

• Radiant systems-Chilled beam systems, radiant ceilings,

• Grounding systems

radiant floors, snow melting

• Lighting / lighting control systems

• Renewable Energy Systems-Solar thermal

• Lightning protection systems

• Resilience Based design-Mission critical systems

• Low-voltage power distribution (600V and below)

• Steam distribution systems-up to 250 psig

• Medium voltage power distribution (4.16kV – 69kV)

• Variable Refrigerant Flow (VRF) systems

• Photovoltaic power systems • Power monitoring • Short circuit calculations, protective device coordination studies, and arc flash studies • Sustainable / LEED Design • Uninterruptible power supply systems

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FACADES • Building enclosure design

PLUMBING / FIRE PROTECTION

• Thermal performance analysis

• Fire pump/Secondary water storage

• Performance Specification

IT & ES SERVICES • Integration of IT&ES into built environment design • Master Planning including IT systems,

tank • Gray/Rain Water retention and reuse system • Hot and Cold domestic water system • Medical/Process compressed air system

Security systems, Airport system,

• Medical/Process special gas systems

etc.

• Medical/Process vacuum system

• Passive & Active infrastructure (network and systems) design • Converged multi-service network design • Wireless LAN (WiFi) and DAS (distributed antenna system) design • Public Address and Digital Signage design • Command & Control Center design • Vulnerability & Threat Assessments • CPTED (Crime Prevention Through Environmental Design) • Access Control and Video Surveillance Systems • Parking Access Revenue Control Systems • Systems Integration planning and management

• Mission critical systems • Natural Gas system • Purified water system • Sanitary waste/vent, grease waste/ vent, and process waste/vent systems • Sprinklers and standpipe • Storm water and overflow systems • Vacuum waste systems

PERFORMANCE MODELING • Climate and micro-climate analysis • Computational Fluid Dynamics (CFD) • Cost analysis • Daylighting analysis • Life cycle cost analysis • Multi-Criteria Performance Analysis

ENERGY MODELING • Energy Infrastructure Master Planning

• Solar resource assessment and levelized cost of energy (LCOE) • Thermal comfort analysis

• Thermal Comfort Analysis • Whole Building Energy Analysis 7 | HOK

Te s t i m o n i a l s “The HOK team delivered a resounding series of design solutions for the airport’s highprofile modernization project.

Multiple

challenges

ranging

from complex existing conditions and attention to solutions that

maintain

We’re honored to work with the best clients, designers, and construction firms in the industry. Here’s what a few of them have to say about our shared experiences.

“

uninterrupted

operations, were achieved with talent, energy and enthusiasm,

We are so grateful to the HOK structural team for their partnership on our project to renovate a factory in a state of disrepair for our headquarters. Our vision of a home for our staff and a thriving community space for our partners would not have been accomplished without the commitment of the structural team to build a strong foundation and backbone. They

always found

creative and effective solutions focused on our goal to

combined with a commanding

create a space that would serve Missouri Foundation for

understanding and use of the

Health well now and for many years to come.”

current modeling technologies.”

Gary Summerlin, Senior Design

Jill Nowak, CFO Missouri Foundation for Health (MFHH)

Manager, City of Atlanta Department of Aviation

“HOK Structural is an excellent collaborator and has been willing to provide us with a range of options that meet our ideas alongside the various constraints of our project. Their experience with large scale projects has truly been an asset for moving our project forward in an exciting and responsible manner.”

Jason Dannenbring, AIA Associate, Snow Kreilich Architects

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“I had the pleasure of working with HOK’s IT&ES (Information Technology and Electronic Systems) team on the LaGuardia Airport Central Terminal Replacement Project.

The team worked collaboratively with Skanska, La Guardia Gateway Partners, and the Port Authority of Y& NJ to develop and deliver innovative solutions to facilitate construction and achieve client goals.

Edward D’Angelo Director Information Technology, LaGuardia Gateway Partners

”

“HOK’s engineers contributed significantly to the success of our Phillips 66 Headquarters project and they were key to helping us set project aspirations that will serve us well in the future. They carefully listened to us and they asked us the right questions.

They explored and presented us with design options early in the design process and helped guide us to zero in on solutions that were best suited for our needs. Their focused efforts on sustainable design and energy efficiency have resulted in our project achieving LEED Platinum status, Energy Star status and an ASHRAE Technology award. HOK’s engineers worked closely with our P66 team and the construction team in a very collaborative way to deliver a project that we are proud to call our home. My thanks for a job well done!”

Jeff French , Director of Facilities Operations Phillips 66

“With knowledge, experience, communications and collaboration, HOK has helped us achieve our goal of having a facility that is consistent, safe and secure.”

Capt. Johnny Reed, UDC Transition Team

“Our West Sacramento Headquarters symbolizes CalSTRS’ promise to sustainability while it provides our employees and visitors with a healthy, stimulating and supportive workplace.

The 17 story, 409,000 square foot building has maintained its US Green Building LEED® Platinum certification since 2011. The energy efficient building features and the participation of our employees in “green” build-

strengthen and advance environmental responsibility in our community.” ing practices

-CalSTRS

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Engineering partners

Building a successful design team can be as challenging and critical to a project’s success as the design itself. We pride ourselves on being an experienced, collaborative member of any team. We appreciate what everyone brings to the table and enjoy working together to deliver the best for our clients.

“The St. Louis MLS Stadium project gave DMA the opportunity to work on an exciting local project with HOK

engineers

from coast to coast, each with unique experiences and backgrounds. The overall experience was a gainful collaboration for all involved.”

Stephanie Spann PE, LEED AP Structural Project Manager David Mason + Associates

“Each time I have had the chance to speak directly with this team I have enjoyed their total focus, I have never felt as if they were in a hurry to get on with something else or had other matters of greater importance to attend to.

Steven Haynes Senior Commissioning Engineer Burns & McDonnell

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”

Over the past 5+ years, HOK and Sykes Consulting have collaborated successfully on the structural design of several projects totaling over $1B in construction cost.

The project types and teaming arrangements have varied depending on project and client needs, and the teams have delivered consistently and successfully.

“The expertise of the HOK engineering team and familiarity of our DMA structural engineers with local construction methods and design criteria meshed well to benefit the overall project.”

Kara Marfell, PE, SE Structural Project Manager David Mason + Associates

“HOK has been an outstanding partner of SYKES for several years. They continually demonstrate a commitment to team success and promote a shared vision of excellence.

Their effective leadership style fosters a collaborative relationship that is built on trust and mutual respect. It is truly an honor and privilege to partner with HOK.” Darien Sykes President, SYKES Consulting

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Construction partners “Through our work at the HJAIA Landside Modernization Project, we had a

great

experience

collaborating

with HOK on the complex engineering requirements for the job. We had a shared focus on doing what is best for our client and delivering an iconic structure for the City of Atlanta. HOK’s design team was always responsive to the project needs and had a great ability to work within the design parameters to drive the project to incredible outcomes.“

“

Successful collaboration with our construction partners, from precon through commissioning, is critical to the projects’ success. We are proud to have strong relationships with some of the best construction firms in the world, developed over years on a range of project types and delivery methods, including Design-Build and CM delivery. We take great pride in our collaborative successes.

We enjoy working with HOK, because we have the same intensity in getting challenges met and we see things with a similar, cooperative attitude. We have been on many projects with HOK, and hope to do many more.

Hartsfield was a challenging project, and that’s precisely why HOK and Beck Steel ended up doing it together. Not just anyone could’ve accomplished that, especially in the timeframe we did...in the busiest airport in the world, at night, over an elevated 7-lane existing active roadway. HOK gets a lot of credit not only for enabling the project to go together, but where the project occurred and how it all came together is amazing.”

John Beck, Jr.

Justis Brogan, LEED AP

President and CEO, Beck Steel

Project Director | McCarthy Building Companies, Inc.

“HOK’s Structural group was creative, responsive, and provided some of the most accurate information during preconstruction of any team we have worked with. They have been, and continue to be, a valued design partner that we look forward to working with on future endeavors.”

ERIKA WINTERS-DOWNEY Senior Engineering Manager,

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McCOWNGORDON

“I had the pleasure of working with HOK’s IT&ES (Information Technology and Electronic Systems) team on the LaGuardia Airport Central Terminal Replacement Project. The team worked collaboratively with

“The success of the Chicago Bears Halas Hall Addition and Renovation was the result of a true partnership between HOK and Mortenson. Having HOK’s structural engineering group as part of the team proved invaluable to the project. As the architect and structural engineer, HOK was able to coordinate closely to achieve the design vision and provide timely resolutions to questions and issues which were key to meeting the project’s challenging fast track schedule.

Laura Sables Leber, Director of Design Phase Management, Mortenson

”

SkanskaWalsh JV, LaGuardia Gateway Partners, and the Port Authority of NY& NJ to develop and deliver sustainable and innovative system solutions to facilitate a complex phased construction and achieve client goals.”

Ted Jadermark Project Director Skanska

“The Enclosures Team at HOK has been consistently responsive and effective in helping SWJV meet the challenges of the LaGuardia Terminal B Project. Our collaborative efforts have culminated in creating a new and beautiful state-of-the-art facility that will enhance the travel experience for generations of people who live in or travel through New York!“ Douglas C. Maines, Project Director Skanska Walsh Design-Build Joint Venture

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Integrating science and art To create the most imaginative design solutions, HOK blends engineering rigor and optimization strategies with architectural logic and poetry. Our engineers work across every major building typology and provide expert guidance across structural, mechanical, electrical, plumbing and ďŹ re-protection engineering as well as facades, information technology and building physics.

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Mercedes-Benz Stadium Halo The Halo structure, if “unrolled,” would be taller than the Eiffel Tower. HOK Engineering’s design was finished in less than two months and earned the National Council of Structural Engineers Association’s coveted “Most Outstanding Project” award.

Salt Lake City International Airport The energy-efficient airport meets demanding seismic criteria with steel moment frames and buckling restrained braced frames while maintaining long, clear spans for traveler movement and sweeping landscape views.

BP High-Performance Computing Center Designed to accommodate “the world’s largest supercomputer for commercial research,” the facility reached a remarkable power usage effectiveness ratio of 1.1 while providing a highly wind-resistant structure protects the computer while providing serene daylit workspaces.

Sidney & Lois Eskenazi Hospital Daylit interior spaces, green roofs, landscaped courtyards and massive cantilevers define this LEED-gold healthcare facility. The hospital is able to serve 20 percent more patients in less square footage than in the healthcare system’s previous space.

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MEET HOK LEADERS Claire Moore, PE, SE, LEED AP BD+C ENGINEERING PRACTICE LEADER

Claire’s work includes a wide range of experience in structural engineering design, project management and construction administration services. Her technical expertise encompasses both linear and nonlinear analysis, seismic evaluations and retrofits, structural design and BIM modeling.

With completed projects ranging from large iconic buildings to small-scale art installations, she has experience in a variety of project types, including higher education, healthcare, justice and aviation.

Claire sits on HOK’s Management Board and Technical Board.

Saad Dimachkieh, PE, CLEP, LEED AP ENGINEERING PRACTICE LEADER

An electrical engineer and engineering leader with nearly 40 years of experience, Saad works closely with owners, architects, consultants and contractors to integrate engineering design throughout all phases of project development. His expertise includes engineering management; design and documentation of lighting systems, power distribution systems and fire alarm systems; and coordination with consultants to design security and telecom systems. Saad sits on HOK’s Technical Board.

Gary Kuzma, PE, CEM, LEED AP, GBE ENGINEERING PRACTICE LEADER

Gary is a mechanical engineer with more than three decades of experience leading the mechanical engineering design for many of HOK’s most complex projects. He integrates innovative, highperformance engineering solutions into each building’s design. Gary leads teams in accommodating clients’ program requirements while ensuring system flexibility, reliability, maintainability and ease of operations. He has broad experience in value engineering and life cycle cost analysis, energy analysis and conservation, and sustainable design.

Matt Breidenthal, PE, SE, LEED AP ENGINEERING PRACTICE LEADER

Matt Breidenthal is a structural engineer responsible for delivering award-winning, complex and demanding multi-disciplinary projects. With a strong record of satisfied repeat clients, Matt brings a deep appreciation for interdisciplinary collaboration and is recognized for his ability to bring innovative and creative solutions. Matt has been lead engineer or Engineer of Record on over $10B of construction. He sits on HOK’s Marketing Board and Board of Directors.

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“We often find simple solutions to complex problems through a

AND AN AWARD-

collaborative team approach.”

WINNING ENGINEERING TEAM “It’s fascinating to imagine what a new space looks like, how people experience a building and how the structure interacts with them.”

“We are partners in delivering great design.”

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PROJECTS BY

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MARKET TYPE

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SC IENCE + TEC HN OLOGY 123 | HOK

SCI EN C E + TE CH N OLOGY HOK’s multidisciplinary engineering team’s cutting edge research and high performance designs foster, efficiency, reliability, maintainability and flexibility for changing program needs.

HOK brings high-performance engineering solutions to the design of science, research and technology environments for academic, corporate, government and other clients. Through our collaborative approach, we develop solutions to meet the hi-tech requirements unique to the research environment — from ventilation and air flow to specialized fume hoods to alternative heating and cooling systems to data technology solutions. We work with our clients to create right-size systems for their specific needs, focusing on sufficient and reliable power, while maximizing energy efficiency.

Through plumbing design, we provide for specialty gases and high purity water design.

In addition, our deep understanding of IT, security and other electronic systems enables us to design technology infrastructure and systems that support current, emerging and anticipated future business needs. Structural solutions address vibration control for research spaces and specialty equipment, seismic design, as well as detailing for interior collaboration and public spaces. HOK has extensive experience in the design and optimization of new and existing laboratory and research facilities for project-specific vibration criteria. We use finite element models and modal analysis in tandem with traditional prescriptive methods in order to more accurately determine vibration performance and optimize for it.

HOK has also developed STREAM, a proprietary parametric tool that links architectural design options with engineering analysis software. It allows us to rapidly generate and analyze a large number of design options, including area-specific velocity and acceleration limits.

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SELECT CLIENTS • Emory University • BP • Stanford Univeristy

2M ⁺ sq. ft.

LEED Platinum Science + Technology facilities designed by HOK Engineering

• Rice University • Colgate Palmolive • AstraZeneca • King Abdullah University of Science and Technology

50M⁺ sq. ft.

Science + Technology space programmed, planned and designed

by HOK in the past 10 years

• University of California - Davis • State University of New York • Georgia Board of Regents • The Pennsylvania State University

ENGINEERING SERVICES

PROJECT TYPES

• Structural Engineering

• Academic Research Facilities

• Pharmaceutical + Biotech

• Energy Modeling and Analysis

• Allied Health Facilities

• Plant + Agricultural Sciences

• Façade Design

• Alternative Energy Research

• Public Health Research

• Audio Visual & Public Address

• Biomedical Research

• Research + Development

• IT Electronics Systems + Security

• Engineering + Physical Sciences

• Science Facility Renovations

• Mechanical Engineering

• Higher Education Science

• STEM Education Facilities

• Electrical Engineering

• Interdisciplinary Research

• Translational Research

• Plumbing and Fire Protection

• Medical Education

• Staging and Phasing

• High-Performance Computing

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ASTRAZENECA SOUT H SAN FRANCISC O L AB Structural Engineering Mechanical Engineering Electrical Engineering Plumbing and Fire Protection

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ASTRAZENECA SOUTH SAN FRANC ISC O LAB San Francisco, California 145,000 sq. ft.

The Astra Zeneca lab renovation project required the installation of the abatement system for the exhaust treatment of effluent gases in the pharmaceutical processes to meet high environmental standards. The abatement system as well as other equipment and lab uses required a large volume of liquid nitrogen and the existing facility infrastructure was not adequate to support all new loads. The challenge was supporting all lab equipment in a small existing mechanical room and service yard.

The design team looked into multiple options such as a nitrogen cylinder/dewar farm, nitrogen generator, reduced abatement running time, and bulk liquid nitrogen (LN2) tank. Per the team’s calculations, bulk LN2 was the most feasible but the challenge was where to house the tank, ultimately solved by an outbuilding the size of a couple parking spots.

Additional electrical and mechanical building infrastructure upgrades were undertaken to support the project operational requirements. The shell building standby generator fuel tanks were enlarged and the standby power circuiting was augmented to allow the laboratory spaces to operate for days without interruption. Through intelligent space planning and HVAC design, the shell building heating and cooling plant, air handling

Minor piping and ductwork interconnections provide N+1 redundancy for all of the major mechanical systems at minimal additional cost to the project.

units, and laboratory exhaust fans were reconfigured.

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BP HIG H PERFORMANCE C OMPUTING CENTER Structural Engineering Mechanical Engineering Electrical Engineering Plumbing and Fire Protection

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BP HIGH PERFORMANC E C OMPUTING C ENT ER Houston, Texas 110,000 sq. ft.

HOK was commissioned to design and engineer a new High-Performance Computing (HPC) facility at BP’s west Houston campus. The three-story, stand-alone building housing all functions and equipment associated with state-of-the-art HPC technology requirements, including “the world’s largest supercomputer for commercial research” and global operations offices spaces.

The fully glazed, undulating north facade captures attention while welcoming visitors with an approachable scale.

Servers and mechanical systems are oriented to the south and encased in the opaque, precast concrete shell.

Optimal solar orientation and highperformance mechanical and electrical systems provide a power usage effectiveness (PUE) well below the typical data center average. When an The fully glazed office spaces are located to the north.

ideal power usage effectiveness (PUE) is 1.0, typical data centers average is 1.8. Yet, the facility reached a remarkable PUE of 1.1 of the total energy.

Designed to resist winds of up to 130 mph, the facade is the building’s first line of defense. Inside, reinforced CMU walls define the data center and protect the computers. Computing spaces are equipped with a steeper roof slope, ensuring that water drains away from the equipment. In the case of a water outage, an underground reservoir can assist with cooling the space and equipment.

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133 | HOK

EMORY UNIVERS ITY HSRB II Structural Engineering

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135 | HOK

EMORY UNIVERSI T Y H EALTH SC IENCE RESEARCH BUILDING H RSB-II Atlanta, Georgia 350,000 sq. ft.

This new biomedical research facility includes office and laboratory space for translational researchers in neuroscience and cancer research, amongst other disciplines. The project has high sustainability goals, and interfaces with an existing facility with tight floorto-floor spacing that might have made achieving those goals a challenge due to limited space for intra-floor services required to achieve high energy efficiency

HOK’s Structural team helped lead integrated design strategies to address this and other key challenges such as providing a 5-10% embodied carbon reduction.

targets.

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The floor framing system is designed to meet tight vibration limits in several laboratory areas. The structural team led a series of multi-parameter optimization studies to arrive at the appropriate balance of structural depth, services depth, location-specific vibration performance that met the project goals within the floor-to-floor height limitation.

The structural team proposed a system that addressed a fundamental challenge at the beginning of design: the project included three large programmatic elements which required different column arrangements. The structural and architecture teams worked together to streamline the program and structure such that the building could employ a single transfer level with a framing layout optimized for both constructability and minimal depth.

The design includes several feature structural elements in the large six-story central atrium, including dual sculpted pedestrian bridges, a multi-tiered cantilever stair, and a prominent full-height façade supported by a concealed truss at roof level.

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KING ABDULLAH UNIVERS ITY SCI ENC E AND TECH NOLOGY Structural Engineering Mechanical Engineering Electrical Engineering Plumbing and Fire Protection

HOK | 138

OF

139 | HOK

KING ABDULLAH UNIVERSITY OF SC IENCE AND T EC HNOLOGY (KAUST) Thuwal, Saudi Arabia 5.5M sq. ft.

T he la rge st LE ED -Platin u m projec t in th e wo r ld a t the t ime it was bu ilt, KAU ST wa s d e li ve re d by HOK desi gn an d en gin eer in g t e a ms in just t hree years .

King Abdullah University of Science and Technology’s (KAUST) is a highly acclaimed world class research university located on the Red Sea coast in Thuwal, Saudi Arabia. It was born from the late King Abdullah’s vision and is a lasting legacy. KAUST consists of 27 buildings totaling 5.5 million square feet, including two million square feet of lab space spread across four 500,000 square foot buildings.

Despite the many challenges of building the campus in Saudi Arabia’s harsh climate, KAUST became the world’s largest LEED Platinum project at the time of its certification and was able to realize substantial reductions in water and energy use. The engineering team integrated many passive design solutions combined with numerous innovative engineering strategies for energy-efficient MEP systems, such as: chilled beams, total energy recovery wheels, underfloor air distribution, smart lighting controls, variable frequency drives and low-friction loss duct and piped design.

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The highly reconfigurable state-of-the-art lab spaces provided by the mechanical team garnered R&D Magazine’s Lab of the Year in 2011. R&D Magazine noted that the campus “contains just about every modern lab concept known today.” This includes interchangeable lab neighborhoods, flexible lab support zones, grid planning, kit-of-parts furniture and MEP, walkable interstitial space, collaboration spaces, large circulation spines, high-height pilot areas, lab daylighting and of course the engineering infrastructure to allow this unprecedented level of flexibility. Further, HOK mechanical worked with KAUST reserchers to deliver a solar-powered desalination pilot plant and continue to provide the university with engineering services when needed to support their ever-evolving cutting edge research.

1 Passive ventilation 2 Local evaporative cooling 3 Recycled condensate 4 High-performance glazing 5 Integrated shading

6 Reflective roofing 7 Rainwater collection 8 PV and solar thermal panels 9 Filtered daylighting

Vast arrays consisting of thousands of solar PV and solar thermal panels cover the innovative roof system, which spans across buildings to block the sun on facades while sheltering outdoor pedestrian spaces. Solar PV harvests nearly 8 percent of the total estimated energy consumption. Highly interactive direct digital controls optimize MEP system operation while continuously monitoring and reporting system performance, energy harvested, energy recovered, and energy used to ensure long term energy management.

141 | HOK

KAUST

One of the most significant project challenges of the $15B project was the extremely aggressive schedule: only 3 years to design and construct. HOK’s MEP and structural engineers rose to the challenge by leading multiple engineering design teams consisting of hundreds of engineers from multiple HOK offices and outside consulting engineering firms on parallel design paths while at the same time working closely with the construction team to deliver early packages for fast track construction.

The structural design included drilling 42,000 stone columns into the ground to ensure the soil could support the weight of the buildings.

HOK | 1 142 42

On the western end of the four lab buildings, concrete trusses create a 55-foot cantilever. Several other buildings incorporate shear walls for smaller cantilevers.

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RIC E UNIVERSITY SPACE SC IENC E AND T ECHNOLOGY BUILD ING Houston, Texas 75,000 sq. ft.

This project included a total replacement of the mechanical, electrical, plumbing, communications, audiovisual and security systems to modernize the Space Science and Technology Building to 21st century standards. The lab space was designed to be modular and easily adaptable for changing research needs by using modular utility connections and building in functionality to reconfigure utilities such as exhausts where required.

Locating the cleanroom in the basement posed its own set of unique challenges due to limited floor to floor height, vibration, and noise mitigation due to the cleanroom’s adjacency to the main mechanical room. The design allowed routing of utilities from the basement to the roof for proper exhaust and connecting the cleanroom to the campus and building chilled, heating and steam systems while maintaining the required N+1 redundancy to keep the cleanroom operational.

HOK’s electrical engineers and interior designers teamed to provide an average lighting power density of 0.4 watts per square foot by using high efficiency LED lighting throughout the building. Setting targets far beyond the code, this achieved a lighting power density less than half that allowed by ASHRAE-90.1-2013.

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Compartmented laser laboratory

The next generation of nano-molecular and biological researches rely heavily on experimentation with lasers to split particles. The laser laboratories required temperature control within 0.5 degrees F, and humidity control within 5 percent relative humidity. HOK was able to provide the tight tolerances required by the researchers by using localized, dedicated air handling equipment.

145 | HOK

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STANFORD CENTER FOR ACADEMIC MEDICINE Structural Engineering Mechanical Engineering Electrical Engineering Plumbing and Fire Protection

147 | HOK

STANFORD C ENTER FOR ACADEMIC MED IC INE Stanford, California 170,000 sq. ft.

The Stanford School of Medicine’s clinical faculty and staff did not have an office space away from the hospital where they could come together to work and collaborate with colleagues, so HOK designed a new building to allow those chance encounters and cross-pollination of ideas to flourish. The large volume glass lobby was provided with a radiant cooled and heated floor for enhanced comfort and energy savings. The initial aspiration was that the center be an entirely naturally ventilated space. A multitude of mechanical systems were evaluated using a Life Cycle Cost Analysis including natural ventilation, solar chimneys, radiant systems and high volume low speed (HVLS) ceiling fans which would make this possible. While concerns regarding pest control in the wooded surroundings ultimately led the client away from 100% natural ventilation, the very high efficiency of the Stanford central energy facility allowed a traditional VAV system to provide the overall best life cycle cost assessment. The large volume glass lobby was delivered with a radiant cooled and heated floor for enhanced comfort and energy savings and AHUs were selected with low face velocities to provide fan energy savings.

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Solar PV & Solar Thermal

Rainwater collection Energy Recovery Green roofs

Radiant slabs vs. UFAD Passive ventilation

Biophilic design

Evaporative cooling

Irrigation

Thermal massing

Stormwater Collection & Treatment

149 | HOK

STANFORD C ENTER FOR ACAD EMIC MEDI C I NE

Several signiďŹ cant structural elements were utilized to create the dramatic approach to the building. Four steel trusses at the roof cantilever out to support the oors below creating a dramatic column free overhang at the entrance corner of the building. The terrace suspended from the trusses offers sweeping views of the hills beyond campus. At the ends of the building wings facing the arboretum, the terraces are cantilevered to allow column-free views. The exterior corridor along one wing of the building is hung from the roof to allow more column-free space at the courtyard adjacent to the auditorium. Two pedestrian bridges link the narrow wings of the building, one hung from the structure above the other rising up out of the landscaped plaza. The bridges allow the narrow building wings to embrace courtyards, while connecting the building occupants to one another. The building provides diverse settings for collaboration near the woods and in plazas, balconies, walkways, porches and terraces. The heavily landscaped plaza conceals a 3-story below-grade parking garage under the building and courtyards. Buckling restrained braced frames comprised the above grade building lateral force resisting system and concrete shear walls in the parking garage portion of the building. The building is designed to meet Stanford’s Seismic Design Guidelines and reviewed via their Peer Review process. A nonlinear analysis was performed to demonstrate the building seismic performance.

HOK | 150

151 | HOK

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UNIVERSITY OF G EORGIA INT ERDISCIPLINARY ST EM RESEARCH BUILDING Structural Engineering

Structural Engineering

153 | HOK

UNIVERSIT Y OF GEORGI A I NT ERDISC IPLI NARY STEM RESEARC H BUILD ING Atlanta, Georgia 350,000 sq. ft.

The University of Georgia Interdisciplinary STEM research building brings Chemistry and Engineering together for a collaborative research experience. It is a four-story, 100,000 sq ft laboratory building over three oors of parking designed to accommodate a future four-story laboratory building. Specialty laboratory equipment in the facility includes mass spectrometry, electron microscopy, engineering instrumentation prototyping and system, and chemistry instrumentation and labs.

An extensive vibration study was performed to optimize the structural bay layout to allow the use of a concrete moment frame and eliminate any concrete shear walls that would intrude on laboratory and parking spaces.

Close collaboration with the vibration consultant validated results and helped optimize the structure to reduce selfweight and material cost.

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To encourage collaboration within the space, a monumental communicating steel stair case connects Levels 2 and 3 and brings light into the core through a light well. Between Phase 1 and Phase 2 laboratory buildings, a multi-story connector structure is anticipated to bridge between the East and West laboratories and contain additional teamwork space.

HOK has extensive experience in the design of structural laboratory facilities, including optimization of the structures’ vibration and natural frequency to meet stringent user requirements while reducing construction cost.

The structural group often designs for future use scenarios to accommodate potential expansion and growth options. The successful collaboration of both of these elements allowed the delivery of a Phase 1 parking garage and laboratory that can readily accommodate the Phase 2 laboratory and connector.

155 | HOK

UNIVERSIT Y OF CALIFORNI A DAVIS VET ERINARY MEDI CINE RESEARCH FACILIT Y Davis, California 118,000 sq. ft.

As laboratory space is typically an energy-intensive use-type, the engineering and architecture team saw this as an opportunity to design labs that minimized mechanical energy use and maximized day-lighting.

Individual offi ces have smart HVAC controls that shuts off ventilation and water to radiant panels when it senses that a window is open. CFD and lighting analysis was used to determine overhead radiant panel location for both occupant comfort and offi ce daylighting.

A centralized stair with operable penthouse louvers provides natural ventilation at the ground fl oor lobby.

The stack effect fostered allows hot air from the lobby to rise and escape through the roof, drawing in colder air from orifices below to ventilate the lobby. On days when natural ventilation is not possible, the lobby can rely on efficient radiant floor heating and cooling.

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Campus chilled water and steam provides the heating and cooling for the rest of the building as well as steam for sterilization of lab equipment. Further, to save energy, offices and labs are each provided their own AHUs. The office AHUs serve chilled beams that are part of a two-pipe changeover system. The labs are also served by chilled beams, however these AHUs contain a run-around coil to pre-heat/pre-cool outside air to reduce energy cost with the added benefit of delivering 100% fresh outside air to the occupants. Level 4 houses a BSL-3 lab with dedicated exhaust fans that have been carefully selected to meet strict plume height requirements.

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@ 4240 LA BORATORY AND OFFI C E

BUILDING

Structural Engineering

HOK | 158

183,000 sq. ft.

St. Louis, Missouri

Housing nearly 500 high-tech jobs, @4240 anchors the Cortex Innovation Community, an urban research district in midtown St. Louis. HOK redesigned the three-story building, providing large floor plates and highly adaptable mechanical systems to support tenants ranging from small startups to established research organizations.

HOK’s design for the LEED Platinumcertified project includes extensive use of renewable building materials and energy efficient measures, including a 50kV photovoltaic array. The team worked within historic guidelines to restore the building’s deteriorating brick facade and upgrade the industrial windows with historically accurate, insulated replacement glazing.

Wh en th e b es t new b ui ld i ng i s no new b ui ld in g : t he stru ctu ral te am de li vered a L EED -P l at in um ur b an- revi va l researc h d i s tr i ct vi a ad a p ti ve reu s e of a 19 4 8 fac tor y

The structural group cut expansive floor openings along the middle of the building allow skylights to illuminate lab and work spaces across floors as well as an interior courtyard. The team engineered a cantilevering multi-story connecting stair and exterior canopy.

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HOK | 186

HOK STREAM

03

The future of bui l di ng des ign i s here

HOK STREAM optimization scripts accelerate the design process, saving time, materials, carbon emissions and cost

+

Optimization algorithms help explore hundreds of design possibilities in the ďŹ rst few weeks of a project

+

Standard engineering design processes are automated, accommodating unexpected design changes in hours, not weeks

+

Estimated material quantities during concept design often within 5% of as-built quantities

+

Complex architectural geometry is rationalized into elegant framing schemes, easy to fabricate, erect, and adjust in the ďŹ eld

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HOK has extensive experience in the design and optimization of new and existing laboratory and research facilities for project-specific vibration criteria. We use finite element models and modal analysis in tandem with traditional prescriptive methods in order to more accurately determine vibration performance and optimize for it. HOK STREAM is a proprietary parametric tool that links architectural design options with engineering analysis software. It allows us to rapidly generate and analyze a large number of design

Sci ence + Technol ogy

options, including area-specific velocity and acceleration limits. This allows for relative

HOK | 200 00

valuations of interdisciplinary design decisions, and accelerated design iterations based on those decisions: structural costs associated with any design option can be quickly evaluated to determine the option that best aligns with the project goals.

STREAM is a substantial differentiator for HOK and our clients: we can develop more optimized solutions faster and more efficiently, including analysis and optimization for Embodied Carbon reduction. Fast Company cited HOK Engineering’s development and implementation of STREAM in recognizing HOK as one of its Most Innovative Companies.

Corridor

OfďŹ ces

Lab space Vibration criteria VC-A

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SERVIC ES AN D SPEC IALTIES

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04

A few of our favorite thi ngs

+HOK’s Engineering team has experience on a wide array of diverse topics, many of which are included in this section. From pedestrian bridges to passive optical networks, from design competitions to displacement ventilation… please reach out if you’re interested to learn more.

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SP E C IALT I E S Ene rgy mo delin g

Energy modeling is an interdisciplinary effor t at HOK, requiring close collaboration between the sustainability, MEP, facade design, and str uctural teams.

T he process starts at the macro-scale to determine orientation and for m for passive climate control and becomes more detailed when MEP system selection, facade condensation analysis and ther mal b r idging studies come to the forefront during schematic desi gn and design development.

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87% window-to-

50% window-to-

87% window-to-wall

wall ratio, Royal

wall ratio (WWR)

ratio + extended slab

Caribbean HQ

ed ges = energy p erfor mance of 50% WWR

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Embodied car bon is CO 2 emitted by raw mater ials extraction, materials processing, construction, repair, and endof-ser vice life (landfill, re-use

SPEC IALTIES Li fe-cycl e anal ysis

or recycling) scenarios.

HOK | 206

Unlike operational carbon associated with heating, cooling and lighting, embodied carbon is emitted almost entirely at the beginning of a building project. Quantifying these emissions informs design decisions, resulting in a lower carbon footprint at each stage of the design p rocess.

C ement replacements, sourcing local materials, and multipurpose structural systems are key components of the carbon reduction process.

While 5% -10% red uctions will earn the p roject additional LEED credits, HOK aims much higher, making net-zero embodied carbon within reach.

Transpor t

You can only improve what you measure

End of use

Understand As a signatory to the SE 2050 challenge targeting

embodied CO 2 by

net-zero structural car bon emissions by 2050, HOK

life-cycle stage

structures quantifies the embodied emissions of every building project’s structure and enclosure by conducting Whole Building Life Cycle Assessment (WBLCA). T his allows clients and designers to make informed desig n decisions which minimize building embodied car bon over the course of the design process.

Pi np oin t s ou rce s of CO 2 emis s ions by b ui ldi ng sys tem. ..

Materials

Repair

.. .a nd by m a t er i a l Polymers

Windows

Glass

Slabs Shallow Exterior walls

foundations

Steel

C oncrete

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Net-zero and LEED Pl ati num

SPECIALTIES HOK | 208

To achieve a Net Zero Energy Building, HOK has developed the 6-Step process to Integrated Performance Design: Discovery & Definition – Our process kicks-off with a sustainability charrette, where our integrated HOK team will work with you to define roles and responsibilities, set targets for energy, water and waste, identify energy benchmarks, Energy Use Intensity (EUI) targets, financial parameters and alternative financing solutions, and potential solutions and incentives for the project.

Climate & Place – The next step is to perform a site and climate analysis for the site to understand external loads, resources and challenges. The analysis should look at topography, geology, biology, and hydrology in addition to context clues, such as cultural norms and systems that are geographically appropriate. The design team will look for opportunities to harvest free water and energy from the site, including rainwater, condensate, natural ventilation, passive solar heating and convection.

Load Reduction – The most cost-effective way to reach net zero is to reduce overall building energy loads before designing a renewable energy system to provide sufficient energy for the building. Load reduction will minimize the renewable energy investment by reducing the size of the photovoltaic array or other renewable energy sources. Load reduction may be achieved and through programming and space requirements reduction, site planning, massing and orientation, building envelope optimization, high efficiency HVAC systems and plug load control. The load reduction will be demonstrated through energy modeling and other analytical tools.

Integrated Solutions – We use design tools to optimize the building envelope, daylight and thermal comfort. We evaluate MEP and structural systems, site and landscape to minimize energy and water resource use that meet the program requirements set by the client and end users.

Renewable Systems – After building energy demand has been reduced through load reduction and efficient systems, the project can employ renewable energy systems to make up the balance of demand. As each project has it’s own challenges, HOK engineers can help determine the correct renewable energy system for each project.

Occupancy – Once the building has been designed to achieve Net Zero Energy over the course of a year, it will be important to monitor, measure and optimize building performance, as well as engage occupants in energy conservation and plug load reduction activities. Building optimization for Net Zero performance is a process rather than a destination.

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SPEC IALTIES

Fac ad e th ermal p erforman c e

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Offset mullion at

Standard mullion

Offset mullio n at

Standard mullio n at

spandrel

at s pandrel

vision g lass

vision g lass

The facade design team blends art and science seamlessly to design facade assemblies, analyzing the c onduction,

convection

and

radiation

that

controls

the

location of the dew point temp erature for each faca destructure condition in the building. Boundary condi tions based upon extensive climate d ata are gleaned from the NFRC and ASHRAE 90.1 to simulate the behavior of the system in research-g rade programs such as THERM.

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HOK | 212

SPEC IALTIES Facade d esign and analysi s

C onstr uctability,

per formance,

and

economy

A beautiful yet high-per for mance build ing skin is scrutinized early in the process for three key reasons: to calculate the weighted average U-value of the assembly, to determine the risk of condensation , and to ens ure constructibility and alignment with the project budget and performance criteria.

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HOK | 214

S PECI ALTI ES Facade thermal performance

65 F and 35%RH = 37F DP 65 F and 35%RH = 45F DP

Academic hospital parapet detail optimization yield ed 5 instead of 4 inches of insulation in the lower lite and replacing metal back pan in lower lite and with insulation tape which raises the temperature of the corner by 14 deg rees. This results in a detail with significantly less risk of c ondensation at this parapet than a standard d etail.

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S P E C IA LT I ES Facad e daylighting performance

Optimize illumance

Minimize glare

Maximize daylig ht autonomy

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Simulation Solemma

of

daylig hting

C limate

Studio

wi th helps

evaluate the trad e off between view and natural light to minimize heat gain and g lare. H OK facades works with the design team to asses options as early in the pro cess as possible to find optimal and

economical

solutions

that

lead to comfortable and productive sp aces

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HOK | 218

SPEC IALTIES Facade innovation

CIRCA DIAN FAÇA DE H OK Facades and WSP Built Eco logy developed a concept based on the Gartner/Permasteelisa Closed Cavity system, curved lites to facilitate automated shading allowing indirect natural light and views at all times.

Potential savings

25%

operational

compared

to

energy

convention-

al b uilding. Structural g lass saves 4,000 tons of embodied carbon by reducing need for aluminum i n the mullion framing.

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HOK | 220

SPEC IALTIES Facade innovation

CIRCADIAN FAÇADE

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SPEC IALTIES

HOK | 222

Facade Innovation

S TRU CTU RAL EX TERIO R ENC LO SU RE T his design for a megapanel cladding system which provides lateral stiffness to the primar y structural frame of a high-r ise tower was a collaboration between the str uctural and facades teams. Designed and analysed to meet code per for mance cr iter ia, the cladding concept reduces the tower’s Embodied C arbon significantly by supplementing core dr ift control with a steel braced panel system that suppor ts a shallow glazing system, in place of a conventional aluminum cur tainwall.

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SPEC IALTIES Desi gn comp eti ti ons

HOK | 2 224 24

Let engineer ing be the difference in your winning competition desig n

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SPECIALTIES

Design comp eti ti ons

Don’t limit yourself: let us provide you with options you didn’t know were possible

HOK | 226

The tension and com pression in a bicycle wheel illustrates the concept enab ling th e vast span.

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Desi g n competiti ons

SPECIALTIES HOK | 228

Unparalleled accuracy at the competition phase: let our STREAM wor kflow help you get a head star t

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Existi ng b ui ld ing s

SPECIALTIES HOK | 230

This is an existing 32 story office building in downtown Houston. It is framed with structural steel and served as the offices for El Paso Energy. Since the entire tower was to be upgraded, it was necessary to upgrade the structure as well to bring it up to date with the occupancy. Over the years, significant changes have been made to the wind code, the wind speeds and wind forces had been revised

The challenge was how to strengthen and stiffen the existing structure to bring it in compliance with the new wind codes. An extensive structural analysis to be much greater than those at the time the tower was designed.

was done using the stiffness of the existing masonry core walls. Since these were interior walls and not reinforced with rebar and not grouted, a detail analysis was done taking the reductions in the stiffness of these existing walls.

Fortunately, there were sufficient such walls and even with the taken reductions provided sufficient stiffness to meet the code required wind forces.

SPEC IALTIES

Renovation

HOK’s structural team renovated an abandoned thirty-yearold former Sysco Distribution center to become a new home of the Houston Food Bank. This 308,000-sf warehouse building allows HFB to improve their logistic and expand community services. Several existing post-tensioned tilt-up wall panels were cut and removed to create the welcome center and main entrance of the facility from nothing but a

Since most of the wall panels were load-bearing elements, the modiďŹ cation to them required special care. To ensure the safety long line of existing loading docks.

of construction, our structural engineer worked closely with the general contractor to develop step-by-step construction procedure in several critical areas such as where the new monumental stair was added.

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SPEC IALTIES

Renovati on

600 Travis, also known as JPMorgan Chase Tower, is the Houston’s tallest building. The original main lobby featured a 5-story tall vertical curtain wall which are being replaced by a new curtain wall system with a pyramid shape. This renovation allows the lobby depth to be expanded and promotes the circulation and the utilization of the lobby area. It also improved the connectivity of the lobby and the outdoor plaza area. To maintain the operations of the building loading dock and several retails in the basement under the lobby, the new curtain wall frame was designed to be primarily suspended from two existing concrete columns at level 6 which minimized the structural strengthening required on the underside

The boundary conditions of the framing system were strategically designed to maximize the structural efficiency and constructability.

of the ground floor slab.

Besides the pyramid curtain wall, the structural team also worked closely with the landscape team to add several site structures and modified landscape profile of the plaza. The design was coordinated to minimize the required structural modification and keep the project under the budget.

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Ad ap tive reuse and renovation

SPEC IALTIES

MISSOURI FOUNDAT ION FOR HEALTH

HOK | 234

St. Louis, Missouri

We are so grateful to the HOK structural team for their partnership on our project to renovate a factory in a state of disrepair for our headquarters. Our vision of a home for our staff and a thriving community space for our partners would not have been accomplished without the commitment of the structural team to build a strong foundation and backbone. They always found creative and effective solutions focused on our goal to create a space that would serve Missouri Foundation for Health well now and for many years to come.�

-Jill Nowak, CFO, Missouri Foundation for Health (MFHH) 235 | HOK

Ad ap tive reuse and renovation

SPEC IALTIES HOK | 236

TYSON FOOD S D ISCOVERY CENTER AND PILOT PLANT Springdale, Arkansas

This renovation and addition to Tyson Foods’ original 1940s headquarters and Brown’s’ Hatchery provides space for 400 IT employees while

revitalizing

landmark.

a

downtown

Springdale

HOK’s design pays homage to the place where familyowned Tyson got its start.

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Ad ap tive reuse and renovati on

SPEC IALTIES

TYSON FOODS DI SC OVERY CENT ER AND PILOT PLANT Springdale, Arkansas

HOK | 238

Wood reclaimed from the original buildings accents much of the interior, including the reception area, stair treads, walls and landing.

Paired with sleek building forms, the reclaimed wood and original brick facades reinforce the connection between innovation and history.

Situated along the Razorback Greenway shareduse trail, the building’s location encourages team members to bike or walk to work. A garden on the west side of the facility has shuffleboard, bocce ball and a fire pit that add to the neighborhood’s vibrancy.

The Emma Avenue Office is one of several projects for which Tyson Foods has partnered with HOK over the past decade.

This renovation and addition to Tyson Foods’ original 1940s headquarters and electric hatchery provides space for 400 IT employees while revitalizing a downtown Springdale landmark.

HOK’s design pays homage to the place where familyowned Tyson got its start. A new light-filled, central lobby links the two historic buildings and provides employees and guests with a place to collaborate.

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SPEC IALTIES C anopi es

Delivering iconic, long-span structures while ensuring continuous airport operations is core to HOK’s engineering for aviation practice. As part of the modernization of the world’s busiest airport, HOK delivered a structural and architectural icon for Hartsfield-Jackson Atlanta International.

Dual 864’ long structural steel canopies clad in ETFE flank the existing terminal and suspend new pedestrian bridges over the existing roadways, with complex existing conditions at each end of the span.

HOK | 240

While the truss chords appear to consist of a consistently varying curvature, they are actually comprised of discrete constant-curvature sections, significantly less expensive to fabricate. The truss splice connections were designed with internal bolts erected during a midnight-to-5am schedule to minimize lane closures, concealed with welded cover plates afterwards. This innovative design process delivered what the airport General Manager deemed “iconic architectural landmarks for the City of Atlanta.”

To make this possible, HOK structural engineers generated parametric structural models integrated with the architectural models to verify viability, performance, and minimize load applied to the existing structures.

This provided continual feedback to the design team and shortened the design process from months to three weeks. Geometric optimization and lightweight ETFE cladding decreased the weight of the structure enough to allow it to rest upon the existing building without additional columns. The sweeping form of the diagrid canopy emerged from the most efficient structural load path found by the team’s algorithm, finessed by creative decisions to simplify construction.

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S P E C IA LT I E S Pe de st ri an b rid g es

HOK | 242

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HOK | 244

of green space near downtown Hous ton. Two separate branches of thi s bri dge draw pedestrians over Memori al parkway and the ri ver b efore adj oi ni ng together i nto a des cendi ng loop at the scul pture park on the oppos i te s ide. The bri dge bel ongs to a famil y of five recreational structures featuri ng l ong spans and dramatic canti levers des i gned by the s tructural group to create spaces for outdoor performance, rel axati on and ri ver sports .

Ros emount Bri dge, Buffalo Bayou Park, Houston TX

SPECIALTIES Pede stria n bridg es

The Buffalo Bayou ri ver wi nds through 160 acres

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S PE CIA LT I E S Sta irs

HOK | 246

Stairs become sculptural centerpieces encouranging interaction between programs, people, and spaces. H OK engineers stairs that appear to float while conforming to deflection and vibration criteria so stringent, they can be clad in glass (and covered by its warranty).

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SPE CIALTI ES Sta irs HOK | 248

T he HOK str uctural team collaborated with the inter iors group to deliver a striking feature staircase for the Nor folk Southern Head quarters project in downtown Atlanta. While the shape of the stair is a set of concentr ic spirals from levels 2-4, the shap e unravels into a surrealist, sculptural ribbon.To suppor t the Cor ian cladding an d shape, curved steel plates were used to for m the stair stringers as well as the hand rail s upports. This improves the structural efficiency by increasing the cross-section moment of inertia.

Ribbon below the stair is a made up of a series of frames linked together by curved steel edge members and joins seamlessly with the steel plate stair at level 2. For this to be successful, an iterative process between the inter iors and str uctural design was imperative. Further, camber was applied to counter the un-raveling effect gravity loads wield on spiral geometr y.

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SPEC IALTIES

Vi b rati on anal ys i s

Successful, proven strategies for addressing structural vibration per for mance and cutting unnecessar y project costs.

T he architecture and engineering team developing options on an integrated approach for the structural framing and mechanical distribution. T his system increased plenum depth by 20%, dramatically increasing energy per for mance while maintaining d esired ceiling height and a wide ar ray of location-sp ecific vibration cr iter ia.

HOK | 250

Vibration criteria can b e major drivers of project cost when ad dressed in an overly conservative way, or a major source of risk if they were to not be addressed sufficiently.

HOK’s Engineering team has

extensive experience in desig ning cost-effective structures for strict vib ration performance on a wi de range of structural systems and types, includ ing laboratories, healthcare facilities, stadia, traini ng centers, bridges, stairs, and renovations. We use advanced analysis techniques to accurately model and op timize structural systems for location-specific vibration criteria and forcing functions, for occupants and for equipment.

We work with the design team

to develop integrated systems solutions that delive r structural p erformance while maintaining sufficient space for services distribution.

251 | HOK

SPECIALTIES

Displacement venti l ati on

Displacement air systems take ad vantage of ther mal stratification to move air through the sp ace at very low velocities. The cooler supply air is introd uced low in the space and is attracted to the warmer surfaces throughout the space. As the air being supplied is warmed a natural draft is created as air is collected and removed at the ceiling level. This design approach lowers the quantity of airflow need ed to condition only the occupied zone of the sp ace.

Because supply air is introduced into the sp ace at an elevated temperature when compared to traditional overhead H VAC systems displacement air systems increase the hours that airside economizer cycles can be used to effectively provide free cooling and red uce H VAC cooling energy.

Ventilation effectiveness is increased with displacement air systems by supp lying air directly to the occupied zone with less mixing than a traditional overhead system thus improving indoor air quality and occupant comfort.

H OK’s engineering team has imp lemented displacement air systems in projects with large volume spaces where conditioning the entire volume of the space would not be efficient, as well as projects where the design teams goal was to minimize or hide the ap pearance of the HVAC system by integrating it into architectural features. On some projects, like the Salt Lake City I nternational Airport, displacement air systems were coupled with evaporative cooling systems to further increase the hours that do not require mechanical cooling.

HOK | 252

SPEC IALTIES

Radiant heati ng and cool i ng

Radiant heating and cooling systems can improve occupant comfort and increase energy savings versus trad itional HVAC strateg ies through better control over operative temperature of the sp ace and the lower transp ort energy inherent to waterbased systems. H igh mass rad iant systems can store energy that can be re-charg ed d uring off hours to offset operational cost.

H OK’s mechanical engineering team has extensive experience with radiant heating and cooling systems through our work on past projects in Aviation, Science and Technolog y and Corporate markets. H OK’s radiant system d esigns have utilized both in-slab , panel systems and chilled beams. On some projects, like the Salt Lake City I nternational Airport, the rad iant systems were coup led with displacement air systems to maximize energy savings.

Through H OK’s collaborative team approach and close integration with our fellow architectural and structural engineering team members radiant floor slabs are designed to op timize appearance, performance and cost.

253 | HOK

SPECIALTIES C entral utili ty p lants HOK | 254

The C ummins concrete cooling towers, the NASA B-48 C UP and the BP High Performance Commuting C enter CUP. The Cummins cooling tower was a collaboration with the struct ural team. HOK designed CUPs have served everything from NASA’s mission control, data centers, universities, laboratories, air ports, justice complexes, manufacturing facilities, office buildings and various other type of mission critical spaces.

C entral Utility Plants (C UPs) are the beating heart of heating and cooling systems in build ings as CUPs provide chilled water, heating water and/or steam to buildings and camp uses. We focus on issues like future expansion, operational flexibility, cost, controllab ility, simplicity, energy-efficiency, plant opti mization, turndown, resiliency, uninterruptable operation, fail-safe operation, continuity of building operations, maintainability and serviceab ility.

Pulling from our vast and extensive experience allows us to efficiently tailor designs to Project specifi c requirements while providing coordinated and multi-di scipline solutions to common issues such as maintainability, serviceability and resiliency. H OK desig ned C UPs have incorporated a variety of technologies to meet the varying project needs including therm al ice storage, field-fabricated custom cooling towers, low temperature cond enser water op eration, commercialgrade D DC controls, industrial-grade PLC controls, central plant optimization software and make-up water storage.

255 | HOK

SPEC IALTIES (

!!+

Und erfl oor ai r sys tems ) . (

! %

Displacement Ventilation systems are able to save energy in a number of ways. While they use air for cooling and heating like VAV systems, they usually only need to supply about 60% as much air to provide the same amount of cooling, which reduces the fan energy. The systems are designed to cool the occupied space only, so space heat loads from items at the ceiling (like lighting) do not necessarily need to be cooled, also saving energy.

HOK | 256

Supplying air at about 68°F/19°C instead of 58°F/14°C can affect the energy both ways – it depends on the climate and what sort of recovery systems are used at the central plant. But in very cold climates or climates with high humidity, this may actually increase energy consumption.

12

6+!!

.1+).

! ?$

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257 | HOK

SPEC IALTIES

Pas s i ve op ti cal networks

New networ k technologies enable d esigners to create buildings that suppor t communications requirements with less space, power, cooling and infrastr ucture. Passive optical networks (PONs) use fiber optic cables that transmit signals more effectively than traditional copper cable-based networks.

For the past several years, PON technology has been used to deliver phone, data and television services into homes. Today, PON equipment is being repackaged into devices appropriate for installation in many building types. Integrating PONs into a building design can generate sig nificant first-cost and long-ter m operational savings.

HOK | 258

Intermediate Distribution Frame (IDF) for a Traditional LAN: Power required: 6-8 kVA for active network equipment Dedicated HVAC required Approximate room area: 120 sf per every 10,000 sf

IDF for a Passive Optical LAN : No power requirements or cooling equipment for passive equipment Approximate Room area: 28sf per every 10,000sf

259 | HOK

HOK | 260

SPEC IALTIES IT security systems

The security automation systems for justice complexes is an innovative design process, minimizing the number and use of traditional control rooms.

Campusus often include a

dedicated security LAN that centralizes the video security system in a single area, making it easier to manage. The security system LAN includes an array of edge, aggregation and core Ethernet switching appliances that provide recording and playback functionality throughout the campus.

261 | HOK

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