地震作用下大跨度斜拉桥和引桥间碰撞分析  

Pounding effects between long-span cable-stayed bridge and its approach bridges under earthquake

作　　者：王斌斌[1] 叶爱君[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》2010年第3期95-99,共5页Journal of Vibration and Shock

基　　金：国家科技支撑计划项目(2006BAG04B00);交通部科技项目(200631882225);国家自然科学基金资助项目(50878147)

摘　　要：强烈地震作用下大跨度斜拉桥和引桥(一般是简支梁桥或多跨连续梁桥)的纵向振动是耦合的,可能发生碰撞及落梁。采用非线性时程地震反应方法分析了梁端的纵向碰撞效应对体系整体反应的影响,其中对碰撞接触单元的刚度进行了比较分析,然后分别讨论了影响碰撞的几种因素,主要是伸缩缝初始间隙大小、相邻结构周期比等的影响。结果表明碰撞对引桥影响相对较大。Vibrations of long-span cable-stayed bridge and its approach bridges are usually coupled under severe earthquake excitations.Longitudinal coupling motion may cause pounding between main and approach bridges or even falling down of main girders.The analysis was conducted with a specific model of cable-stayed bridge.The pounding effects at the movement joints were discussed and the influences of different impact stiffness were evaluated.The effects of some parameters including structural period ratio of adjacent bridge segments and initial gap size at expansion joints were investigated.The results show that the pounding effects on approach bridges are more evident.

关 键 词：斜拉桥 碰撞效应 地震反应 引桥 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]