Structural Narrative Code Requirements: Section 602.2: Types I and II Type I and II construction are those types of construction in which the building elements listed in Table 601 are of noncombustible materials, except as permitted in Section 603 and elsewhere in this code.
Table 503 -Height limit: Unlimited (Flight path restrictions limit the height limit to no greater than 150’ near the southern part of the site and 110’ near the northern part of the site.) Area Per Story: Unlimited Table 1019.1 Occupant Load per Story: 1-500 Minimum Number of Exits: 2 Table 1016.1 Exit Access Travel Distance: Assembly (Sprinkled): 250’ Business (Sprinkled): 300’ Mercantile (Sprinkled): 250’
The diagram to the right shows how the vertical and lateral loads are handled through the structure of the building.
Vertical & Lateral System Diagram:
Veritcal loads are transferred from the beams and girders to the columns and core. They are then transferred down the building to the foundation.
Lateral loads are transferred through the facade to the beams. They are then transferred to the cores of the building.
Dead End Hallways (Sprinkled): 50’
Table 1004.1.1 Maximum floor area in square footage per occupant Total occupants -Business 180,000 sqaure feet--100 sqaure feet per per son-- 1800 people -X-factor (Inside) 10,000 square feet--30 square feet-- 333 people
-X-factor (Outside) 10,000 square feet- 7500 square feet usable-15 square feet per person- 500 people
Lobby 7,500 square feet- 5 square feet per person- 1500 people Retail 22,500 square feet- 60 square per person- 375 people Total= 4500 Occupants
508.3.3 No required separation of occupancies (hours)
508.3.3 No required separation of occupancies (hours) Table 601 Fire rating Structural framing--3 hours Bearing Walls Exterior--3 hours Interior-- 3 hours Table 602 -Non-Bearing wall partitions (exterior)--0-1 hours (depending on loca tion on exterior wall) -Non-Bearing wall partitions (interior)--0 hours -Floor Construction--2 hours -Roof Construction--2 hours
Envelope vs Structure: -The columns will be placed 18” from the center of the column to the face of the finished wall. -The building envelope is designed to maximize daylighting on the south facade, controlling overheating and glare on the east and west facade and minimizing heat loss on the north facade. Shading devices will be incorporated into the east and west facade while a double skin will be used on the south facade. The north facade glazing will be minimized.
When designing the structural system, the idea of structural expressionism was a desired effect. To accomplish this, the Winter Garden design was planned to be a floating structural truss to express the shelter in an elegant way. Similarly, the two floor truss on the East of the building not only eliminates problematic columns from the tenant space below, but also expresses the open cooperative office that Macrofrim and JCN share. While aesthetic was a consideration, so too was overall function. As previously mentioned, the two floor truss is a uniqe condition that eliminates columns that would impede tennant space utilization. Also, the structural framing is organized such that the framing members over the corridors are significantly smaller. With more interstitial space in the corridor, many system elements such as VRF units may be placed without sacrificing space. In this way, maintainence can be performed on the units without disturbing speculative tenants.
FIFTH FLOOR WITH COLUMN LINES SCALE: 1/32” = 1’- 0” 16
Published on May 12, 2013