基于IDA的钢筋混凝土桥墩随机地震响应概率特征分析  

Statistic Analysis of Stochastic Seismic Response for RC Pier Based on IDA

作　　者：冯清海[1,2] 袁万城[2] 

机构地区：[1]中交公路规设计院有限公司桥梁技术中心,北京100088 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《武汉理工大学学报（交通科学与工程版）》2009年第5期936-939,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家863计划项目(批准号:2007AA11Z102);国家自然科学基金项目(批准号:50778131)资助

摘　　要：选取56条ⅡI类场地近场地震波,采用IDA分析方法,对3个不同墩高的混凝土桥墩进行分析.以桥墩的墩顶位移响应为研究目标进概率特征统计,得出以下结论:对于低周期桥墩,墩顶位移响应及地震波峰值加速度在取双对数的情况下,对于每个地震波峰值加速度,位移响应的对数近似可以看成正态分布,且位移响应对数的均值与地震波峰值加速度的对数呈线性关系,其方差随着地震波峰值加速度的增加呈增大趋势,但并非线性关系.同时,墩的高度也是影响墩顶位移响应离散性的因素之一,墩的高度越大,墩顶位移的离散性也越大.Based on IDA （Incremental Dynamic Analysis）, three RC piers with different height are analyzed with 56 seismic waves which are belong to Ⅲ kind site and near field. Distance seismic response of top piers is analyzed statistically, and the results indicate that, for RC piers with low period, the Ln （D） which is the logarithm of distance response is regarded as Gaussian distribution approximately under each Ln（PGA） which is the logarithm of PGA. At the same time, the average of Ln（D） is linear relation with Ln（PGA）, and the variance also increases with Ln（PGA） but not linearly. It is also clear that the height of RC pier is also an influence factor of the variance of Ln（D） which raises with the increment height of RC pier.

关 键 词：IDA 钢筋混凝土桥墩 随机地震响应 特征分析 

分 类 号：TU1[建筑科学—建筑理论]