斜拉桥抖振分析中计入背景分量的实用方法

在大跨桥梁的拌振分析中，通常采用的是Ｓｃａｎｌａｎ颤拌振分析方法，这一方法只考虑了共振响应、而忽略了背景响应，最近的研究表明背景分量在某些情况下可能占有较大比重，因此考虑背景响应具有一定的必要性，在对背景分量进行详细分析和大量计算的基础上，拟合出包括各种影响参数的适合于斜拉桥竖向抖振背景响应修正的计算公式，可以在斜拉桥竖向抖振计算中方便地计入背景响应。

Practical Method for Calculating Buffeting Response Including the Background Part of Cable-stayed Bridges

In the Scanlan Method or buffeting response spectrum method, which is commonly used to analyse the buffeting response of long-span bridges, the background part of the response is omitted. The newest research indicatcs that the background part may be important in many cases, and it is necessary to analyse the response including the background part. In this paper, a formula which can improve the results from the methods mentioned above is proposed. By using the formula, buffeting response including resonant part and background part can be calculated in a convenient way.