平行双幅斜拉桥涡振特性气弹模型试验研究  

Study on vortex-induced oscillation of parallel bridge with twin-decks via aeroelastic model test

作　　者：周奇[1,2] 朱乐东[2,3] 

机构地区：[1]汕头大学土木工程系,广东汕头515063 [2]同济大学桥梁工程系,上海200092 [3]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动工程学报》2013年第4期522-530,共9页Journal of Vibration Engineering

基　　金：桥梁结构抗风技术交通行业重点实验室开发课题(KLWRTBMC12-01);汕头大学科研启动经费资助项目(NTF12007);科技部国家重点实验室基础研究资助项目(SLDRCE08-A-02)

摘　　要：以天津塘沽海河大桥为工程背景,通过全桥气弹模型试验对平行双幅斜拉桥的涡振特性进行了研究。首先,基于一阶涡振的试验结果,推导出高阶涡振最大振幅的估算公式;然后,通过对比高阶涡振的估算结果与全桥气弹模型试验结果,给出了估算公式的计算精度并分析了产生偏差的可能原因;最后,通过全桥气弹模型试验研究了多孔板对涡振的减振效果,并利用CFD手段从流场的角度定性地解释了多孔板减振原理。研究结果表明:全桥气弹模型试验可以直接成功模拟出高阶涡振现象,并且各阶涡振的斯托罗哈数保持一致;基于一阶涡振试验结果估算高阶涡振可能会使风速锁定区间变长,并且最大振幅估算值与全桥模型试验值有一定偏差;多孔板具有较好的涡振减振效果,而这与多孔板的透风率大小和安装位置直接有关。Different from the bridge with a single deck,the aerodynamic interference phenomenon caused by the two neighboring decks makes the aerodynamic performance of the parallel bridge with twin-decks much more complicated.Tanggu Bridge over Hai River in Tianjin,a parallel bridge with twin-decks,was taken as an engineering background.The present paper focuses on the vortex-induced oscillation （VIO） study of Tanggu Bridge which involves the amplitude analysis and the selection of vibration-reducing measure.The results firstly show that the high-order VIO can be successfully simulated via the full bridge aeroelastic model test and the Strouhal numbers of each VIO remain the same.Secondly,the high-order VIO can be estimated by the first-order VIO test,but the lock-in zone of wind speed may be larger than that of the test results.Besides,the maximal amplitudes of the estimation are smaller than those of the test results,the reasons of which are also analyzed briefly in this paper.Thirdly,the multi-orifice plate has a good vibration-reducing effect,which is related directly to the perforated ratio and its location.

关 键 词：桥梁工程 涡激共振 全桥气弹模型试验 平行双幅桥 减振措施 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]