山区风作用下大跨悬索桥响应分析

发布时间：2018-01-04 12:17

本文关键词：山区风作用下大跨悬索桥响应分析　出处：《西南交通大学学报》2015年04期 　论文类型：期刊论文

【摘要】：为了研究山区非平稳强风下大跨悬索桥静风及抖振响应,以云南普立大桥为工程背景,基于该桥址处实测风速样本,对大跨桥梁展开风致响应分析.首先,根据实测风速样本确定了时变平均风并且估计了脉动风谱.然后,在考虑了恒载结构初始内力状态下进行了非线性静风响应分析.最后,采用虚拟激励法分别针对实测风谱与规范风谱对该桥进行了抖振响应研究.计算结果表明,该大桥的抖振以竖向振动为主,并且其位移响应比静风突出;10 min常值平均风会低估该桥的静风响应;由规范风谱得到的主梁抖振响应偏于不安全.研究结论可为同类山区大跨桥梁风致静力及抖振响应研究提供参考.
[Abstract]:In order to study the static wind and buffeting response of the long-span suspension bridge in mountainous area under non-stationary and strong wind, the wind-induced response of the long-span bridge is analyzed based on the measured wind speed samples at the bridge site, taking the Puli Bridge in Yunnan Province as the engineering background. The time-varying mean wind is determined and the pulsating wind spectrum is estimated according to the measured wind speed sample. Then, the nonlinear static wind response analysis is carried out considering the initial internal force of the structure under dead load. Finally, the nonlinear static wind response is analyzed. The buffeting response of the bridge is studied by using the virtual excitation method for the measured wind spectrum and the normative wind spectrum. The calculated results show that the buffeting vibration of the bridge is mainly vertical and its displacement response is more prominent than that of the static wind. 10 min mean wind will underestimate the static wind response of the bridge. The buffeting response of the main beam obtained from the canonical wind spectrum is less safe. The conclusion of the study can be used as a reference for the study of wind-induced static and buffeting responses of long-span bridges in similar mountainous areas.
【作者单位】：西南交通大学土木工程学院;
【基金】：青年千人计划资助项目四川省基础研究资助项目(2015JY0060)
【分类号】：U448.25;U441.3
【正文快照】： 近年来,随着我国西部地区高速公路、铁路及能源通道的快速建设,已经出现了越来越多的跨越山区峡谷的大跨桥梁.在建和已建的桥梁包括矮寨大桥、坝陵河大桥、北盘江大桥和普立大桥等.山区峡谷桥址风场特性与沿海、平原地区有着明显的区别,山区峡谷气候复杂多变、阵风强烈、湍流

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