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Study on the seismic performance of a double
spherical seismic isolation bearing

Peng Tianbo, Li Jianzhong, Xu Yan and Fan Lichu
Department of Bridge Engineering, Tongji University, Shanghai 200092, China

Abstract: In this paper, the coniguration and working mechanism of the recently developed double spherical seismic
isolation (DSSI) bearing are introduced in detail. Then, vertical displacement of the DSSI bearing due to sliding on a spherical
surface is analyzed. The results from seismic performance testing of the bearing are given, and a numerical analysis of a
four span continuous girder bridge is performed. The numerical analysis compares the inluence of three different bearing
arrangement schemes on the structural seismic response, and the results show that the DSSI bearing is effective in increasing
the vertical load bearing capacity, reducing the vertical displacement, and controlling the energy dissipation capacity within
a certain range.

Keywords: DSSI bearing; seismic isolation; vertical displacement; energy dissipation; continuous girder bridges