矮墩T构桥梁弹塑性地震响应分析

Elastic-Plastic Seismic Response Analysis of T-Framed Bridge with Low Piers

以某铁路T构大桥为工程背景,利用桥梁有限元分析软件建立该桥空间模型,运用反应谱法和时程分析法计算该桥在地震作用下的地震响应,分别对多遇地震、设计地震及罕遇地震作用下的矮墩T构桥梁进行抗震分析验算,总结双薄壁矮墩T构桥梁的动力特性。计算表明:双肢薄壁墩在矮墩T构桥梁中具有较好的抗震性能,罕遇地震作用下主墩虽进入延性状态,但满足规范大震不倒的要求。这为类似桥梁的抗震设计提供参考。

Taking a railway T-framed bridge as an engineering background, the spatial model of the bridge is established by using the finite element analysis software of the bridge, and the seismic response of the bridge under earthquake is calculated by response spectrum method & time history analysis method. The seismic analysis & checking of low-pier T-framed bridges under frequent earthquakes, design earthquakes and rare earthquakes are carried out respectively, and the dynamic characteristics of double thin-walled low-pier T-framed bridges are summarized. The calculation results show that the thin-walled piers have good seismic performance in T-framed bridges with low piers. Although the main piers are in ductile state under rare earthquakes, they can meet the requirements of the code, no collapse under severe earthquake. It may provide reference for seismic design of similar bridges.