大跨度桥梁抖振响应的频域分析

Frequency Domain Analysis to Buffeting Respones of Long span Bridges

抖振是大跨度桥梁易发生的一种风振形式。本文根据风洞试验结果和随机振动理论 ,探讨了处于自然大气湍流中大跨度桥梁抖振的计算方法。在该方法中 ,自激力采用了更适合抖振特点的完全非定常自激气动力形式 ,抖振力采用了一种可显示表示水平阵风和竖向阵风贡献的非定常模型。

Buffeting is one of recurring aeroelastic dynamic response of long span bridge. A method used to predict the buffeting responses of long span bridges to natural turbulent wind was proposed by using wind tunnel experimental results and stochastic theory. In this method, instantaneous aerodynamic forces and a new buffeting force model were used. To illustrate the present method, the buffeting responses of two long span suspension bridges were calculated.