Transverse seismic response analysis for bridges considering performance degradation of bearings and stoppers

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (2) : 189-196.

WU Gang1,2，WANG Quan-lu3，WANG Ke-hai1,2， ZHANG Pan-pan2

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Abstract

The friction sliding feature of laminated rubber bearings and the mechanical performance of stoppers have significant influences on the transverse aseismic ability evaluation of medium-small span bridges. A cyclic loading test was conducted to investigate the friction sliding feature and the mechanical performance of laminated rubber bearings after sliding, the effects of relevant parameters, such as, vertical compressive stress, loading rate and rubber material were considered. The FE model of a three-span prestressed concrete continuous beam bridge was built and its transverse seismic responses were studied with the incremental dynamic analysis method considering performance degradation of bearings and stoppers. The results showed that laminated rubber bearings have a certain damage due to friction and sliding under the action of horizontal cyclic loads; their damage levels are different under different affecting factors, but their friction sliding feature can tend to a stable state gradually; friction sliding damage of bearings and stoppers’ performance degradation have significant influences on the transverse seismic responses of bridges, they interact each other, so the performance degradation of bearings and stoppers should be considered in aseismic analysis of medium-small span bridges.

Key words

laminated rubber bearings / stopper / aseismic analysis / cyclic loading test / finite element (FE) analysis / performance degradation

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WU Gang1,2，WANG Quan-lu3，WANG Ke-hai1,2， ZHANG Pan-pan2. Transverse seismic response analysis for bridges considering performance degradation of bearings and stoppers[J]. Journal of Vibration and Shock, 2018, 37(2): 189-196

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