桥梁单墩不同侧向力分布模式Pushover分析方法

Pushover分析使用一定分布模式的递增水平侧向力代表地震作用下结构惯性力的分布,分布模式的不同会直接影响Pushover分析的结果, 尤其是结构高阶振型影响显著时,因此侧向力分布的选取是Pushover分析中的一个关键问题。本文通过选取7条强震地震波，对比了典型地震波下非线性时程分析（IDA）和采用4种不同侧向力分布模式的Pushover分析的15m、30m和60m墩的地震反应。并从总体、构件和截面三个层面对各种模式Pushover分析进行评价，分析其适用性。研究表明结构进入非线性和高阶振型影响显著时，自适应侧向力模式较其他模式Pushover分析结果更接近IDA分析结果。

Pushover analysis of different distribute lateral load patterns for seismic assessment of bridge piers

Pushover analysis uses the incremental distribute lateral load pattern to substitute the inertial load under earthquake response. The difference of lateral load patterns will affect pushover analysis results directly, so the load pat-tern selection is one of the critical issues in pushover analysis, especially when the higher mode influences are important.Here, 7 earthquake records were selected. Earthquake responses of 15m, 30m and 60m bridge piers were compared by u-sing time history analysis (IDA) and pushover analysis with 4 different lateral load patterns. Three various structural lev-els were used for evaluation of different lateral load patterns in pushover analysis. The study showed that the results of a-daptive pattern pushover analysis are more precise than other patterns, when the structure is in higher inelastic state and the higher mode effects cannot be neglected.