强震作用下独塔斜拉桥模型的非线性动力响应分析

发布时间：2018-04-05 10:03

本文选题：独塔斜拉桥　切入点：振动台试验　出处：《东南大学学报(自然科学版)》2015年02期

【摘要】：建立了基于隐式积分和显式积分的2种有限元模型,对独塔斜拉桥振动台试验中得到的地震响应特性及其破坏模式进行了模拟.然后,利用基于隐式积分的有限元模型,分析了行波效应和索塔梁耦合振动对独塔斜拉桥地震响应特性的影响.结果表明:基于隐式积分的有限元模型可以有效地模拟斜拉桥发生破坏前的地震响应特性,而基于显式积分的有限元模型则可用于模拟独塔斜拉桥在地震作用下发生破坏的全过程;由于输入地震波频谱效应以及视波速各异,行波效应对独塔斜拉桥地震响应特性的影响各不相同;在强震作用下,模型会发生索塔梁耦合振动,导致主塔的纵桥向位移响应明显增加.
[Abstract]:Two finite element models based on implicit integral and explicit integral are established, and the seismic response characteristics and failure modes of single tower cable-stayed bridge are simulated.Then, using the finite element model based on implicit integral, the effects of traveling wave effect and cable-tower beam coupling vibration on the seismic response characteristics of single-tower cable-stayed bridge are analyzed.The results show that the finite element model based on implicit integral can effectively simulate the seismic response characteristics of cable-stayed bridges before failure.The finite element model based on explicit integral can be used to simulate the whole process of the failure of single tower cable-stayed bridge under earthquake, because the frequency spectrum effect of input seismic wave and apparent wave velocity are different.The effects of traveling wave effect on the seismic response characteristics of single tower cable-stayed bridge are different. Under strong earthquake, the coupled vibration of cable and tower beam will occur in the model, which leads to the obvious increase of displacement response of the main tower longitudinal bridge.
【作者单位】：福州大学土木工程学院;东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178101,51378112) 招商局重庆交通科研设计院有限公司桥梁工程结构动力学国家重点实验室开放基金资助项目(201401)
【分类号】：U441.3;U448.27

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