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Shaking table test on pounding responses of simply supported isolated bridges under earthquake excitation

LI Zhongxian,ZHANG Yong,YUE Fuqing(School of Civil Engineering,Tianjin University,Tianjin 300072,China)  
Seismic pounding has significant influence on the seismic responses of bridges and maybe is the critical factor causing the damage to some bridges.A shaking table test on pounding responses of simply supported isolated bridge is done.A two-span simply supported isolated bridge model is designed firstly,and the influences of gap,mass ratio of adjacent girders and properties of isolated bearing on the pounding responses of the bridge are investigated.Testing results show that the parameters,including gap and mass ratio of adjacent girders and properties of isolated bearing,have significant effects on the pounding responses of bridges.The bigger the gap of the adjacent girders is,the lower the frequency of pounding becomes.The larger the mass ratio of adjacent girders is,the larger the impact force becomes.The lead rubber bearing has higher capacity of energy dissipation than the plate rubber bearing,and may reduce the impact force between the adjacent girders or even avoid the occurrence of the pounding of bridges.This provides a reference for pounding prevention design of bridges.
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