双向地震作用下高铁FPS隔震简支梁桥纵向地震碰撞反应研究

Study on longitudinal seismic pounding response of high-speed railway simply supported girder bridge isolated with FPS under bilateral earthquake excitation

为了准确分析FPS隔震桥梁的纵向地震碰撞反应,针对一典型3跨FPS隔震简支梁桥,建立了考虑FPS双向耦合效应和梁缝处三维碰撞效应的非线性动力计算模型,分析双向地震作用下FPS隔震简支梁桥纵向地震碰撞反应;研究支座半径和摩擦系数对简支梁桥纵向地震碰撞反应的影响规律。研究结果表明:横向地震作用会增大简支梁邻梁间纵向地震碰撞次数和碰撞力,降低墩底纵向剪力;为减小地震碰撞反应,设计时可适当增大支座半径和支座摩擦系数。

For accurate analysis of longitudinal seismic pounding response of bridge isolated with FPS, based on a typical simply supported girder bridge （SSGB） isolated with FPS, a nonlinear dynamic model was established which considers bi-directional coupled effect of FPS and three-dimensional pounding effects at expansion, the influence of longitudinal seismic pounding response of SSGB isolated with FPS under bilateral earthquake excitation was ana- lyzed, and effects of FPS＇ s frictional coefficient and radius on longitudinal seismic pounding response of SSGB were investigated. The results show that the transversal earthquake excitation increases longitudinal numbers of pounding and pounding force between adjacent girder, while reduces the longitudinal shear force in bottom of pier, appropri- ate increases of frictional coefficient and radius of FPS are recommended to mitigate seismic pounding response in design.