金马大桥抖振响应的时域分析

Time Domain Analysis on Buffeting of Jinma Bridge

金马大桥是一座独塔斜拉桥与两侧T构相连接的大跨度协作体系桥梁,该桥结构形式新颖且桥位处于台风多发区,因此,对该桥进行抖振响应分析是非常必要的。首先利用谐波合成法将脉动风速模拟为多个互相关的随机过程,接着给出抖振力和自激力的时域表达式,据此对金马大桥进行了抖振响应分析。结果表明,尽管该协作体系斜拉桥采用抗扭能力较差的边主梁形式,但其抗风能力是有保证的。

Jinma bridge is a long span cooperative -system cable -stayed bridge with one tower cooperated with T frames on both sides. Owing to artistic form and lying in typhoon -prone area, it is essential to process the buffeting analysis. In this paper, the turbulent wind velocity was first simulated with cosine wave superposition method as multicorrelated random processes; then, the time domain expressions for the buffeting and self- excited forces were given. On this basis, the buffeting analysis of Jinma Bridge was made. The results show that the anti - wind capacity of the cooperative - system cable - stayed bridge is ensured although the torsional resistibility of the main girders of this bridge is not good.