多点激励下高墩大跨桥梁抗震性能分析

基于OpenSEES平台，建立高墩大跨桥梁的弹塑性结构模型，对比分析在一致地震激励及行波输入下桥梁结构的地震反应特性，并对行波输入下高墩桥梁的破坏过程进行详细研究。分析结果表明，地震波频谱特性及地震动输入方式对桥墩的出铰位置和破坏顺序有较大影响；高墩的破坏主要表现为弯曲破坏，单墩墩顶截面出铰或达到极限状态往往先于墩底截面，设计时应引起重视。

Seismic Performance and Failure Process of Long-Span Bridge With High Piers

Based on OpenSEES platform, elastic-plastic structural model of long-span bridge with high piers is established. This paper utilizes time-history analysis method to analyze seismic responses of bridge under consistent or multi-support seismic excitation. Seismic performances and failure process for bridge with high piers are studied. Analysis results show that characteristics of seismic excitation and the way of excitation input have some effect on failure sequence and the occurrence or location of plastic hinge for bridge piers. The failure mode for high piers assumes bending failure, and the failure for top of pier is frequently prior to that of pier bottom, which should be paid enough attention.