Pushover方法在双柱桥墩抗震性能评估上的应用

Application of Pushover Method to Seismic Resistant Performance Evaluation of Double Column Bridge Pier

静力弹塑性分析方法(Pushover Analysis)是一种静力非线性计算方法,近年来在国内外结构设计中得到广泛研究应用,是评价结构抗震能力的新方法.Pushover分析方法多用于建筑结构,但在桥梁中的具体实施方法和结果表达方式与建筑中有所不同.本文针对客运专线的双柱桥墩,归纳与总结了Pushover分析方法的实施步骤及原理,结合能力谱法确定了结构在指定强度下的目标位移,并通过地震需求曲线和结构能力曲线的叠加来评估结构的抗震性能.分析结果表明,不同侧向加载模式分布下Pushover法的分析结果存在一定差异,客运专线双柱桥墩在多遇地震和罕遇地震下的横向抗震性能均满足工程使用要求.

Static elasto-plastic analysis （Pushover analysis） is a combination of nonlinear static analysis, which is becoming a popular tool for seismic performance evaluation of existing structures. In general, Pushover analysis is used to build structures, but execution method and expression styles in the bridges are different with the buildings. The procedure and principle are generalized for double column piers of passenger line, target displacement of destined intensity earthquake are determined by bonding capacity spectrum, seismic performance is evaluated by superimposing demand curve of the earthquake andstructural capacity curve. The result demonstrates that the analysis of Pushover method in various lateral loading patterns has different values and the transverse seismic performance in small earthquake and rare earthquake can meet engineering requirements.