三维随机激励作用下斜拉索参数振动的有限元分析

发布时间：2018-01-11 04:18

本文关键词：三维随机激励作用下斜拉索参数振动的有限元分析　出处：《桥梁建设》2017年02期 　论文类型：期刊论文

【摘要】：为了解风荷载和车辆荷载作用下斜拉索的位移响应,以某双塔斜拉桥为例,建立斜拉索的有限元模型,采用时域抖振分析和车-桥耦合振动分析方法,得到风荷载和车辆荷载作用下斜拉索的索端位移激励,对斜拉索参数振动进行分析,分别讨论了不同方向索端位移激励下斜拉索的位移响应,并分析了风速及车速的影响。结果表明:风荷载引起的随机位移激励作用下,斜拉索的位移响应随风速的增加逐渐增大,但较正弦激励作用下的响应小;车辆荷载引起的随机位移激励对斜拉索中点的位移响应影响很小;顺桥向的随机位移激励对斜拉索的垂向位移响应影响较大,横桥向的随机位移激励对其影响较小。
[Abstract]:In order to understand the displacement response of cable under wind load and vehicle load, a finite element model of cable-stayed cable is established by taking a double-tower cable-stayed bridge as an example, and time-domain buffeting analysis and vehicle-bridge coupling vibration analysis method are adopted. The displacement excitation of cable end under wind load and vehicle load is obtained. The vibration of cable parameters is analyzed and the displacement response of stay cable under different direction displacement excitation is discussed respectively. The effects of wind speed and speed are analyzed. The results show that the displacement response of stay cables increases gradually with the increase of wind speed, but the response is smaller than that under sinusoidal excitation. The random displacement excitation caused by vehicle load has little effect on the displacement response at the middle point of stay cable. The vertical displacement response of the cable is greatly affected by the random displacement excitation along the bridge direction, but the influence of the random displacement excitation of the transverse bridge direction is relatively small.
【作者单位】：西南交通大学桥梁工程系;沈阳铁路局;
【基金】：国家科技支撑计划课题(2012BAG05B02) 交通运输部建设科技计划项目(2014318800240)~~
【分类号】：U441.3;U448.27
【正文快照】： 1 引言斜拉索作为斜拉桥的主要受力构件,将主梁所受的大部分静、动荷载传递到桥塔。斜拉索是柔性结构,具有“一大两小”的特点,即大柔度、小质量、小阻尼。随着斜拉桥跨度的增加,斜拉索的长度也越来越长,其动力问题是关注的重点。在实际桥梁中,斜拉索的上、下两端分别与桥

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