独塔单索面斜拉桥地震动弹性与弹塑性响应分析

Seismic dynamic-elastic and elastic-plastic response analysis of single tower single plane cable-stayed bridge

以某座独塔单索面斜拉桥为研究对象,通过有限元软件MIDAS/CIVIL建立了全桥的空间有限元模型,并分别采用弹性时程分析和弹塑性时程分析方法,对其进行动力特性及地震动响应分析,分析可知弹性时程分析与弹塑性时程分析对于独塔斜拉桥的地震动响应结果不管是位移还是内力响应均有较明显差别,因此对于跨度较大的斜拉桥应当考虑其非线性因素,使模型的模拟更加符合实际结构,并通过综合弹塑性和弹性分析,得到相对可靠的结果。

With a single tower single cable-stayed bridge as the study object, the spatial finite element model of the whole bridge was established using the finite element software MIDAS/CIVIL. The elastic time history analysis method and the elastic-plastic time history analysis method were respectively used to analyze its dynamic characteris- tics and seismic dynamic response. It is known form the analyses that, the seismic dynamic response results of the single tower single plane cable-stayed bridge whether in displacement or internal stress response all differ apparently using the two analysis methods, therefore, nonlinear factors should be considered for wide span cable-stayed bridge to make the model simulation fit the actual structure more, and relative reliable results were obtained through compre- hensive elastic-plastic and elastic analyses.