斜拉桥抖振响应中的背景分量的影响

Effect of the Background in the Buffeting Response of Bridges

Scanlan方法是目前进行大跨桥梁抖振分析的常用方法．该方法认为抖振响应主要由共振响应构成，而背景响应可以忽略文中以杨浦大桥竖向弯曲抖振为例，详细分析了风速、频率、阻尼、气动系数、桥型等因素对抖振背景分量在总抖振响应中所占比例的影响．结果可供对依据Scanlan方法或抖振反应谱方法计算得到的共振响应进行修正时参考．

The Scanlan Method is commonly used to analyze the buffeting response of large bridges. In his theory, the buffeting response is mainly composedof resonant oscillation, and the background of buffeting can be omitted- In thispaper, a detailed analysis about the effect of the background part is presented,andthe effect of factors such as wind velocity, structural frequency, damping, static aerodynamic coefficient, and bridge type on the background is studied. The result can be used as a rcfcrence to revise the calculation resu1t from Scanlan Method.