Vibration transmission might occur at mixed-use buildings, where vibration sources such as parking levels and health clubs and sensitive occupancies such as residential units, offices and research labs share the same floor or are located at different levels of a building. Vibrations from such sources travel up and sideways and become a source of annoyance for the users. We build complex finite element models involving multiple floors or the whole building and diagnose any potential vibration issues before the building is built and recommend necessary vibration control measures. For existing structures, we take vibration measurements, verify and locate the issue and recommend cost-effective, least intrusive, creative solutions using cutting-edge analysis methods with finite element model simulations.
During the design phase, a concern was raised about vibration transmission between garage levels and apartment units on the lower floors of the tower. Structural frames of the garage levels were modified to control vibration transmission.
The project used day-time and night-time vibration criteria for residential occupancies as per ANSI guidelines.
A finite element model of a typical floor plate holding both residential units and the garage was built. Vibration transmission analysis was performed by simulating a pick up truck traveling along the garage lane and resulting floor velocities were calculated in the apartment units. Maximum vibration levels were compared against the vibration criteria. Garage floor framing was modified to control vibration transmission.
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