栏杆对典型桥梁断面涡激振动的影响研究  

Effects of railings on vortex-induced vibration of a bridge deck section

作　　者：管青海[1] 李加武[1] 胡兆同[1] 刘健新[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《振动与冲击》2014年第3期150-156,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51078038)

摘　　要：为了研究栏杆对典型桥梁断面涡激振动的影响,通过风洞试验分别研究了有无栏杆桥梁断面的涡激振动响应。试验研究表明:裸梁断面风洞试验没有发生涡激振动,上下表面的脉动压力对涡激振动的贡献很小;栏杆断面风洞试验则发生了明显的竖向涡激振动现象,上下表面中下游脉动压力对涡激振动贡献较大。栏杆使得上表面的来流分离更严重,改变了上表面的压力系数均值,但不能改变下表面的压力系数均值;栏杆不仅能够改变上表面的压力脉动分布,同时也显著增大下表面的压力脉动幅值。The vortex-induced response of a box bridge girder deck with and without railings was investigated using wind tunnel tests to identify vortex excitation and effects of railings on vortex-induced vibration of a bridge deck.Two spring-suspended models （a deck with railings and a bare deck）were tested.Measurement of the fluctuating pressure on the deck surface indicated that vortices shed from the downstream section with railings have a larger contribution to the vertical vortex-induced vibration,while the pressure fluctuations on the entire upper and lower surface of the bare section have little contribution to the vortex response;the presence of railings does not change the mean pressure distribution of the soffit plate,but significantly changes the pressure distribution on the upper surface;when introducing railings,the fluctuating pressures on the entire lower surface and the downstream of the upper surface markedly increase.

关 键 词：桥梁断面 栏杆 涡激振动 风洞试验 压力系数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]