斜拉索风致随机振动的计算机模拟

Computer Simulation ofWind Induced Random Vibration on Stay Cables

斜拉索是斜拉桥的主要受力构件之一,由于其柔度大、质量小、阻尼小和自振频率低等特点,对风荷载比较敏感,在风载作用下极易发生振动,因此有必要对这种结构风振响应进行研究。通过在斜拉索有限元模型上导入随机风荷载,用计算机模拟斜拉索的风振响应,为进一步研究风振响应的控制打下基础。该方法可以节省研究成本,提高研究效率,对斜拉桥的设计具有一定的参考意义。

Stay cable is one of the main components in cable-stayed bridge. Since this component has large compliance, light weight, small damp and low natural vibration frequency, the wind-induced vibration may occur very often, Thus, it is necessary to study the vibration response of the stay cable to the wind load excitation. In this paper, random wind load is introduced to the finite element model of the cable. Wind induced vibration of cables is simulated with the computer. The method is proved economic and effective. It has significance for design of the cable-stayed bridge, and provides a base for further study of wind-induced response control.