连续梁桥HDR支座的优化配置及减隔震效果研究

Research on optimal Allocation and Seismic Isolation Effect of HDR Bearing for Continuous Beam Bridge

结合超越概率水平为40%、10%、2%的地震波,以某连续梁桥为实例进行非线性动力时程分析。分析发现过渡墩处滑动支座在地震中将会产生过大位移,结构有发生落梁的危险;过渡墩处采用滑动支座会削弱过渡墩的地震分担比,使地震荷载在各墩之间分配不合理。通过调整过渡墩处的支座参数,将滑动支座更换为初始水平刚度较大的高阻尼橡胶支座后,支座的位移量得到了较好的控制,各墩的地震响应均较为接近,高阻尼橡胶支座能够在地震中发挥较好的减震耗能作用。

A continuous beam bridgehas been analyzed with dynamic time-history method,and earthquake waves with exceeding probability to be 40 percent,10 percent and 2 percent have been used.The research result shows that the displacement of sliding bearings were much more lager than the high-damping rubber bearings set on continuous piers,the superstructure of bridge has the risk of falling.The sliding bearings set on transitional piers have weakened the load sharing percent of transitional piers,so that the load distribution of piers is nonuniform.As the parameters of bearings set on transitional piers have been changed,the high-damping rubber bearing with higher initial horizontal stiffness was suggested to be used.The displacements of bearings have been controlled in the allowable displacement,and the seismic responses of piers were much more reasonable.Thehigh-damping rubber bearings have obviously damping and isolation effect.