Shake Testing of Frame Structures Retrofitted with Viscous Dampers to Mitigate Seismic Pounding

Abstract eng:
Many cases of structural damages were attributed to pounding during major seismic events. Pounding occurs when the gap between buildings are not wide enough to allow for their relative motions during seismic events] Viscous dampers, installed across the gap between buildings, were considered for seismic retrofit to mitigate pounding. Two steel frames representing a flexible building adjacent to a rigid building were tested in shake table using ground motions of varying intensities and varying gap widths between the frames. Results from shake table testing indicate that viscous damping devices significantly reduce the seismic pounding response without adding new seismic demands on any of the adjacent buildings. The damping devices were found to be more effective for the test cases in which frames were excited by high-intensity ground motions. It was also found that dampers work more efficiently for cases in which frames were separated by small gaps than for the cases in which frames are touching each other at rest condition.

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