| 拉索松弛对独塔斜拉桥地震反应的影响 |
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| 引用本文： | 王垲,夏修身,陆兆文,刘魏,高泽亮.拉索松弛对独塔斜拉桥地震反应的影响[J].世界地震工程,2022,38(3):101-107. |
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| 作者姓名： | 王垲 夏修身 陆兆文 刘魏 高泽亮 |
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| 作者单位： | 兰州交通大学 土木工程学院, 甘肃 兰州 730070 |
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| 摘 要： | 为了研究地震作用下斜拉桥拉索松弛对独塔斜拉桥地震反应的影响，采用桁架单元模拟斜拉索，考虑拉索垂度效应，基于OpenSees平台建立了考虑成桥状态及拉索松弛的全桥有限元模型，输入5条强震记录进行地震反应分析，探究了斜拉索松弛及其对斜拉桥关键部位地震反应的影响规律。结果表明:强震作用下独塔斜拉桥的拉索会产生松弛，但拉索松弛现象仅发生在部分边索中；拉索松弛对最不利受力索的位置和最大索拉力影响可以忽略；拉索松弛可能增大也可能减小结构地震反应，其影响不可忽略且受地震动的频谱影响较大，应引起设计的注意。
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| 关 键 词： | 斜拉桥 拉索松弛 地震反应 自重效应 |
Effect of cable relaxation on seismic response of single-tower cable-stayed bridges |
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| WANG Kai,XIA Xiushen,LU Zhaowen,LIU Wei,GAO Zeliang.Effect of cable relaxation on seismic response of single-tower cable-stayed bridges[J].World Information On Earthquake Engineering,2022,38(3):101-107. |
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| Authors: | WANG Kai XIA Xiushen LU Zhaowen LIU Wei GAO Zeliang |
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| Affiliation: | School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China |
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| Abstract: | In order to study the influence of cable relaxation on seismic response of single-tower cable-stayed bridge under earthquake action,truss element is used to simulate the cable,and cable sag effect is considered. Based on OpenSees platform,a full bridge finite element model considering the bridge state and cable relaxation is established. Five strong earthquake records are input to conduct seismic response analysis. The law of cable relaxation and seismic influence on key parts of cable-stayed bridge are investigated. The results show that the cables of the single-tower cable-stayed bridge will relax under strong earthquake,but the relaxation occurs only in part of the side cables. The influence of cable relaxation on the position of the most unfavorable cable and the maximum cable tension force can be ignored. The cable relaxation may increase or decrease the seismic response of the structure. The effect cannot be ignored and is greatly affected by the frequency spectrum of ground motion,so it should be paid attention to in design. |
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| Keywords: | cable-stayed bridge cable relaxation seismic response gravity effect |
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