双向耦合效应对FPS隔震桥梁地震响应的影响  

Bi-directional coupled effect of friction pendulum system on seismic responses of an isolated bridge

作　　者：吴陶晶[1] 李建中[1] 管仲国[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2011年第2期119-123,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(90815007)

摘　　要：利用两正交水平方向力的作用条件下FPS支座非线性动力行为的双向耦合弹塑性恢复力数学模型,针对一典型大跨度FPS隔震连续梁桥,对比了在墩高、球面半径和支座屈服强度等参数变化的情况下,考虑和忽略FPS支座恢复力的双向耦合作用时桥梁的非线性时程响应结果。研究表明这种双向耦合作用对隔震桥梁的地震响应有着重要的影响,如果忽略双向耦合作用,会大大低估支座变形的峰值响应,这对隔震桥梁设计是不利的。The bi-directional coupled effect of FPS under two horizonta1 orthogonal directional excitations was investigated.Based on a nonlinear numerical model of a typical continuous long span bridge isolated with FPS,its seismic responses taking into account or ignoring the bi-directional coupled interaction of the support restoring force were compared at different levels of parameters,such as,pier height,yield strength of support and support surface radius.The results showed that the bi-directional coupled interaction has considerable effects on the seismic responses of the isolated bridge;if these effects are ignored,the peak support displacements will be greatly underestimated,this situation is harmful to designing an isolated bridge.

关 键 词：隔震桥梁 摩擦摆式支座 双向耦合效应 地震反应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]