河口铁路大桥的地震反应分析

Seismic Analysis of Hekou Railway Bridge

以河口铁路大桥为工程背景,采用结构分析软件ANSYS建立三维有限元模型,进行了模态分析;并通过与相同跨度直线桥模态分析的结果对比,分析了该桥的振动特点.在此基础上,运用反应谱法和时程反应分析法,计算了该桥在不同地震动输入方式下的地震响应,并与相同跨度直线桥时程反应分析结果进行了比较,分析结果对于同类型曲线梁桥的结构设计,动力特性以及抗震性能的分析有一定的借鉴意义.

Hekou Bridge is a railway curved continuous boxgirder bridge. A 3dimensional finite element model for this bridge is established by using ANSYS.Based on the model,modal analysis and seismic response analysis are carried out.In order to get the different dynamic characteristic of curved bridge from ordinary straight beam bridge,a straight beam bridge with the same span is also analyzed.Moreover,a few critical issues in response spectra analysis for curved bridge are also probed.