柱式钢筋混凝土桥墩的弹塑性抗震简化计算  

Simplified Calculation of Elasto-plastic Performance of RC Column Bridge Piers

作　　者：郑越[1] 陈兴冲[2] 戴利民[1] 杨士金[1] 

机构地区：[1]同济大学建筑设计研究院桥梁工程设计分院,上海200092 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《公路交通科技》2006年第4期76-79,共4页Journal of Highway and Transportation Research and Development

基　　金：高等学校骨干教师计划资助项目

摘　　要：在强震作用下柱式钢筋混凝土桥墩会进入塑性状态,采用考虑有刚度退化的武田三线型模型(弯矩-曲率关系),对一典型的双柱式桥墩进行了弹塑性有限元抗震分析,通过引入等效塑性铰长度的概念将其简化为两自由度结构模型,采用考虑有刚度退化的武田三线型模型(力-位移关系)进行计算。研究结果表明,墩顶位移结果及滞回曲线形状均吻合较好,为柱式桥墩的弹塑性抗震计算提供了一种简单可靠的计算途径。When the RC column bridge pier subject to intense earthquake excitation, the pier will enter into the state of plasticity.In this paper, based on a tri-linear hysteretic modal （moment ～ curvature relationship） taking into consideration of the depression of the secant stiffness, a representative double-column bridge pier is analyzed under seismic excitations by the elastic＇plastic FEM.By intreducting the concept of ＇equivalent length of plastic hinge＇ ,the FEM modal was simplified as 2DOF modal.Considering the tri-linear hysteretic modal （force ～ displacement relationship） the 2DOF was analyzed under seismic excitations. The study shows that the displacement of the pier at the top fits the hysteretic curve well.So the method this paper pat forward provides a simple and credible approach to calculate the elastic-plastic seismic response of column bridge pier.

关 键 词：桥梁工程 弹塑性 双柱式桥墩 简化计算 地震反应分析 

分 类 号：TU311[建筑科学—结构工程]