新型斜拉桥与摩天轮组合结构在地震多点激励作用下的响应分析

Response Analysis of Seismic Multi-excitations of Composite Structure by New Stye Cable-Stayed Bridge and Giant Wheel

地震地面运动的空间变化效应(特别是行波效应)对大跨度结构的响应有很大影响。本文以天津慈海桥为工程背景建立了新型斜拉桥和摩天轮组合结构的动力分析模型,利用通用分析软件ANSYS对慈海桥行波效应进行了分析与讨论,研究比较了是否考虑行波效应以及不同相位差条件下行波效应的结构位移和内力响应,得到了慈海桥独特的地震反应特性。研究结果表明:与一致地震激励相比,地震动的空间变化特性可以使慈海桥的地震响应发生较大改变。

The spatially varying effects of the ground motions especially the traveling wave effect, have great influences on the dynamic responses of long-span structures. In this paper, a complete dynamic bridge model composed by new style cable-stayed bridge and giant wheel of Tianjin CiHai Bridge is established for seismic analysis. Advanced commercial structure analysis software of ANSYS is successfully used on the study of the traveling wave effect in the seismic behavior of CiHai bridge. And the structure responses under the traveling effect of the different phase transformation are compared. The earthquake responses characteristics of CiHai Bridge are thus obtained. Based on this study the conclusion that is obvious changes of CiHai Bridge responses have taken place with traveling wave effect is drawn. The responses of cablestayed bridge under seismic excitations with spatial variations differ from those under uniform seismic excitations.