大跨度斜拉桥多维多点随机地震激励响应分析

发布时间：2018-02-24 00:03

本文关键词： 大跨度斜拉桥多维多点激励随机响应地震动作用　出处：《西南交通大学学报》2014年05期 　论文类型：期刊论文

【摘要】：为研究大跨度斜拉桥地震激励下的平稳随机响应规律,以某大跨度斜拉桥为例,用ANSYS软件建立了三维有限元分析模型.考虑地震动的多维性、行波效应、部分相干效应及局部场地效应对主梁及主塔位移和内力随机响应的影响,用该模型分析了大跨度斜拉桥在多维多点地震激励下的响应.研究结果表明:相对于一致激励,大跨度斜拉桥在多维多点激励下的结构响应显著增大,主梁的纵向位移增大了约2.3倍,1号塔顶的纵向位移和塔底横向弯矩分别增大了约2.2和2.3倍;仅考虑一致地震激励不能保证大跨度斜拉桥的结构安全;考虑行波效应时斜拉桥的地震响应减小,相干效应较小可忽略,软场地条件下结构的地震响应更大.
[Abstract]:In order to study the stationary random response of a long-span cable-stayed bridge under earthquake excitation, a three-dimensional finite element analysis model is established by using ANSYS software, taking a long-span cable-stayed bridge as an example. The multi-dimensional effect of ground motion and traveling wave effect are considered. The effects of partial coherence effect and local site effect on the random responses of the main beam and the main tower displacement and internal force are analyzed. The response of the long-span cable-stayed bridge under multi-dimensional and multi-point seismic excitation is analyzed by using the model. The results show that the model is relative to the uniform excitation. The structural response of the long-span cable-stayed bridge under multi-dimensional multi-point excitation increases significantly, the longitudinal displacement of the main beam increases about 2.3 times, the longitudinal displacement of the top of the No. 1 tower and the transverse bending moment of the bottom of the tower increase about 2.2 and 2.3 times, respectively. Considering the traveling wave effect, the seismic response of the cable-stayed bridge is reduced, the coherence effect can be neglected, and the seismic response of the structure under soft site condition is larger.
【作者单位】：西南交通大学土木工程学院;西南交通大学峨眉校区;
【基金】：国家自然科学基金资助项目(51308465,51378443) 中央高校基本科研业务费专项基金资助项目(2682014CX004EM)
【分类号】：TU311.3

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