钢-砼混合梁斜拉桥的颤抖振时域分析

Flutter and Buffeting Analysis for Cable-stayed Bridge with Steel-concrete Girder

以大跨钢-砼混合梁斜拉桥为研究对象,利用三次拉格朗日多项式插值的改进谐波合成法模拟了大桥所处场地的脉动风荷载.在此基础上,采用ANSYS建立了大跨斜拉桥的有限元模型,并利用ANSYS的APDL语言进行了二次开发,编制了能够计算钢-砼混合梁斜拉桥颤抖振响应的程序.研究结果表明:大跨钢-砼混合梁斜拉桥的颤抖振响应不仅会引起桥梁疲劳振动,进而降低桥梁构件的使用寿命,而且会危及施工人员和机械的安全,影响成桥运营后的行人舒适性和高速行车的安全性.

Based on long-span and steel-concrete bridge, the perfect stochastic fluctuating wind field process is generated to simulate stochastic wind loads by using improved WAWS method. Then, the FEA model of long-span cable-stayed bridge is established by using ANSYS. Based on ANSYS parametric design language, one calculation program is prepared to calculate the flutter and buffeting analysis for cable-stayed bridge with steel-concrete composite girder. Some meaningful conclusions are drawn that flutter and buffeting would cause vibration fatigue to reduce the lifetime of bridge members and endanger the safety of builders and machines. And, flutter and buffeting also have bad effects on pedestrian comfort and the security of high-speed road. Some meaningful references, which are used to calculate flutter and buffeting of long-span and steel-concrete bridges, are provided for further research on wind-induced vibration for long-span bridges.