205. finite element analysis of moat wall pounding in base-isolated buildings
Name: Patrick Joseph Hughes
Grad Year: 2021
Seismic isolation is an effective strategy to improve the performance of structures under ground shaking, but requires large displacement demands at the isolation level. Under extreme seismic loading conditions, there exists a potential for the superstructure base to exceed the provided clearance and impact the surrounding moat wall. Previous studies of this phenomenon were primarily analytical, using various simplified approaches to simulate pounding, but efforts to capture the impact force-displacement response using a high-fidelity finite element model are more limited. Furthermore, very few large-scale experiments have been conducted to support the numerical results. This paper summarizes a series of experiments performed at the University of Buffalo?s Structural Engineering and Earthquake Engineering Simulation Laboratory, as well as a simplified impact element used to capture the pounding force-displacement response. A 3-D finite element model of the experimental pounding setup is presented, and impact simulation results are compared with the experiment and previous numerical studies. Additionally, different levels of complexity for the finite element model are examined to study the effect on pounding response.
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