基于位移的Pushover分析在高墩抗震分析中的应用  

A Displacement-based Pushover Procedure for Bridge Seismic Performance Study

作　　者：卢皓[1] 李建中[1] 盛光祖 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]武汉地产开发投资集团有限公司,武汉430000

出　　处：《结构工程师》2013年第2期93-100,共8页Structural Engineers

基　　金：国家科技支撑计划(2009BAG15B01);国家自然科学基金项目(51008222);西部交通建设科技项目(200731882233)

摘　　要：采用传统的只考虑基阶振型的非线性静力方法分析非规则结构的抗震性能会产生较大误差。针对山区桥梁百米级非规则高墩,通过对地震动输入下墩底曲率达到最大时刻的结构刚度进行瞬时模态分析,探讨了整个非线性过程中瞬时振型、瞬时振型参与系数随着墩底曲率增加的变化规律,进而提出了基于位移的非线性静力分析与增量动力分析(IDA)相结合的一种简化方法。通过和IDA分析以及传统的基于惯性力的非线性静力分析方法的分析结果比较,证明该方法在快速估计高墩的抗震性能的适用性和准确性。The conventional nonlinear static analysis procedure considering only fundamental mode has some draw- backs in predicting the seismic performance of irregular structures. For the pier with a height of 100 m in moun- tainous areas, modal analysis was carried out for transient structural stiffness when the pier curvature reaches the maximum value under different ground motion levels. The change trend of the transient mode shapes and transi- ent modal participation factors were investigated with the increasing of pier base curvature. The displacement- based pushover procedure combining the incremental dynamic analysis （IDA） was used in the bridge pier analy- sis. To prove that the method is applicable and accurate, the results obtained by using this method were com- pared with the results by using obtained incremental dynamic analysis （IDA） and forced-based pushover method.

关 键 词：高墩 墩顶位移 基于位移的Pushover方法 增量动力分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]