斜拉桥拉索风雨激振机理的理论研究.pdf

第八届全国振动理论及应用学术会议论文集，上海，2003 年 11 月 斜拉桥拉索风雨激振机理的理论研究 顾明，黄麟，王国砚 (同济大学，上海 200092) 摘 要： 从理论上研究了斜拉桥拉索风雨激振的机理。首先在风洞中对带人工水线的拉索模型进行了试 验，得到了气动力随水线平衡角的变化关系。然后，建立了拉索和水线的运动方程，在将气动力展开并取线 性项的条件下，讨论了拉索水线平衡角位置对风雨激振稳定性的影响，得到结论：水线在拉索表面的周向震 荡是导致拉索风雨激振具有较大不稳定范围的主要原因。进一步对拉索运动方程直接进行数值计算，根据计 算结果，提出了拉索风雨激振机理的一种解释。 关键词： 斜拉桥拉索，风雨激振，稳定性，机理 Theoretical studies on rain-wind induced vibration of cables of cable-stayed bridges GU Ming, HUANG Lin, WANG Guo-yan (Tongji University, Shanghai 200092) Abstract: Mechanism of rain-wind induced vibration of cables of cable-stayed bridges is theoretically studied. A wind tunnel test of a cable model with an artificial rivulet is first carried out to obtain the aerodynamic force coefficients of the cable model. Then equations governing motions of the cable and the rivulet are established. Based on the motion equations, the effect of the upper rivulet’s motion around the cable surface on the unstable vibration of rain-wind induced vibration of the cables is theoretically investigated. The computational results indicate that the motion of the rivulet is the key factor for the unstable motion of the cable under simultaneous action of rain and wind. Direct numerical computation on the equations governing motions of the cable and rivulet is further carried out. Based on the discussion of the computational results, a proper explanation for the mechanism of rain-wind induced vibration of cables of cable-stayed bridges is finally put forward. key words: Cable of cable-stayed bridge, Rain-wind induced vibration, Stability, Mechanism 基金资助：国家自然科学基金项目、国家杰出青年科学基金项目和教育部高等学校骨干教师计划联合资助 作者简介：顾明（1957—），男，江苏兴化人，博士，教授，博导 1 1 前言 斜拉桥跨度的不断增大