客运专线双柱式桥墩的地震损伤分析

Analysis on the Seismic Damage for Double Column Pier of Passenger Dedicated Line

依据我国现行的《铁路工程抗震设计规范》,合理地选取了强震记录作为地震输入,采用大型有限元分析软件,考虑柔性地基效应和地震动特性的影响,建立了某客运专线双柱式桥墩的有限元模型,并基于Park-Ang地震损伤模型和非线性地震响应分析,研究了客运专线双柱式桥墩的地震损伤全过程.分析结果表明:①桥梁结构的损伤破坏主要是发生在地震过程的中前期;②即使所采用的地震动记录的场地类型和PGA都相同,但它们对桥梁结构所造成的损伤还是有较大差异;③虽然PGA对桥梁结构损伤性能指标的影响十分显著,但它对结构最大损伤性能指标的发生时间并没太大的影响.

Reasonable strong seismic motion records are selected according to the applicable Code of Seismic Design for Railway Engineering.By using FEA software,the FEA model of one double-column pier of passenger dedicated line is established with considering the effect of flexible base effects and seismic characteristic.Based on Park-Ang seismic damage model and nonlinear seismic response analysis,the seismic damage analysis on double-column pier of passenger dedicated Line is carried out.The study results are obtained as follow： 1） The seismic damage of bridge mainly happen during the early and middle stage of seismic motion.2） There are still major discrepancies in the seismic damage made from the seismic records which come from the same site condition and have the same PGA.3） Although PGA has a great effect on the seismic damage index,it has nothing to do with the happening time of max seismic damage index.