斜拉桥拉索风雨激振控制的试验研究

Testing Study on Controlling Rain-wind Induced Vibration of Cables of Cable-stayed Bridges

斜拉桥拉索因其柔度大、质量小、阻尼低的特点,在风雨共同作用下易发生大幅振动,对斜拉桥的危害极为严重.目前,对拉索进行表面形状处理的方法被认为是较为有效的风振控制措施.为此在模拟人工降雨条件下,进行了拉索风雨激振和气动控制措施的风洞试验,研究了多种参数对拉索风雨激振特性的影响,特别研究了降低拉索风雨激振的螺旋线方法.实验结果表明,适当设计螺旋线的高度和螺距可消除拉索的风雨激振.

Stayed cables of cable-stayed bridges are prone to suffer from rain-wind-induced vibration,which is especially harmful to the bridge, due to its large flexibility, small mass and low damping. Currently, treatment of the surface of cables is considered to be effective in controling wind-induced vibration. This paper aims to study the mechanism and aerodynamic control means of rain vibration. By reproducing the rain condition in a wind tunnel, the effects of several parameters on the rain-wind induced vibration and spiraled wires countermeasure for controlling the vibration are investigated The testing results indicate that proper height and step of spiraled wires on the cable' s surface can effectively suppress the rain-wind-induced vibration of cables.