Dynamically Sensitive Structures
At NIRAS, we advise on all types of constructions, including structures subjected to dynamic action.
Expertise
covers the entire Life Cycle
Our expertise generally spans the entire life cycle from the idea, concept and planning phase through design, supervision and construction management to operation and maintenance, renovation and reinforcement, and finally to disposal and replacement of structures.
The projects are often supported by BIM 3D modelling as well as by visualizations to clarify the geometry, quantities and interfaces of the structure.
Experience combined with innovative Solutions
We solve basic tasks based on existing knowledge and acquired competencies through completed projects. But we will not be limited by past achievements. On the contrary, we combine the knowledge gained with innovative and value-creating solution alternatives in the projects.
Trusting Cooperation
At NIRAS, we have a strong focus on the fact that the cooperation with the customer must be characterized by an open and trusting dialogue that uncovers the customer’s needs in the best possible way. It is our experience that a close cooperation, where the customer’s situation and wishes are put at the center, also gives the best results.
From Problem to Structure
Issues in relation to dynamically influenced constructions can be versatile and can involve very different approaches depending on the individual problem. Typical challenges may be floors in buildings, where solutions with sufficiently high comfort level must be ensured during the design phase. Whether it is hollow core decks, steel composite beams or modern
“NIRAS plays a crucial role in devising the infrastructure of the future and when upgrading the existing infrastructure to meet society’s changing needs.”
high frequency cross laminated timber decks (CLT) with alternative design parameters. This also applies to walkways, where load cases such as vandalism can be the guiding design criteria in relation to ultimate safety. An alternative is the Tuned mass damper for walking action on particularly slim bridges.
Wind load can also be a focal point on certain structures, especially in relation to maximum impact load or vortex sheading, including additional focus on fatigue. Other times, it is the seismic action that needs to be handled, or foundations subjected to dynamic mechanical load. The user of the Structure is always essential, and there is a big difference between offices and grandstand sections in stadiums.
A clear understanding of the problem and the associated risks is crucial when the task is to be solved in the best possible way. This gives the customer a satisfactory Structure afterwards. NIRAS has solved this type of task for many years, and would like to help you with all types of dynamic problems.
Bridges and special Structures
For 20 years, NIRAS has contributed to the expansions of the Danish infrastructure and has thereby created many of the bridges in the Danish landscape. Within the past 10 years, we have expanded our competencies to cover the Norwegian infrastructure as well, including the construction of serveral Norwegian bridges.
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Examples of projects:
2023-2026: Gl. Hovedvej from Ny Bane Vestfyn project. 3 span continuous post tensioned concrete bridge carrying high-speed trains and hence dynamic acceleration analysis.
2020-2023: Børneriget. Vibration analysis for human comfort of composite floor in hospital rooms.
2006-2008: Ågade bridge. Human induced dynamic analysis including design and installation of Tuned mass dampers
2021-2024: Kajima tower stand: Tower Stand for Wind Turbine in seismic area in Japan.
2021-2024: H. Lundbeck In-Vivo. Velocity calculations in relation to person induced rhythmic loading in animal laboratories.
2002-2008: DR Byen. Calculation of human induced vibrations of the grandstand structures including preparation and design of tuned mass dampers.
Max Baagøe Rasmussen
Technical Director
Bridges and special structures
+45 4299 0317 mxbr@niras.dk
2014-2016: Design of railway bascule bridge across the Limfjord. Dynamic analysis including fatigue analysis.
2014-2016: Byens bro. Human induced dynamic analysis of Odense footbridge.
2023-2024: OUH. Client advisor regarding vibrations of footbridges between buildings.
Jakob Kinimond Vejvad
Senior Specialist
Bridges and special structures
+45 6040 9148
jkn@niras.dk
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Credit: iStock/ Viacheslav Chernobrovin