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.
出处
《振动与冲击》
EI
CSCD
北大核心
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)
关键词
隔震桥梁
摩擦摆式支座
双向耦合效应
地震反应
isolated bridge
friction pendulum system（FPS）
bi-directional coupled effect
seismic response
