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为了降低大跨桥梁抖振响应计算中由传统简单指数函数形式的脉动风相干函数引起的联合接受函数计算误差,提出了一种脉动风相干函数的理论计算方法,并基于该方法,通过引入几个额外的参数对传统相干函数模型进行修正,从而克服了由脉动风相关性引起的结构响应计算误差。为了便于工程应用,在满足精度要求的条件下,对改进模型进行了适当简化,并基于改进相干函数模型,对大跨度桥梁抖振分析中的联合接受函数进行计算。结果表明:与传统计算方法相比,基于改进相干函数的联合接受函数的计算误差可降低约35%。
In order to reduce the calculation error of the joint acceptance function caused by the traditional simple exponential function in the calculation of chattering response of long-span bridges, a theoretical calculation method of the fluctuating wind coherence function is proposed. Based on this method, Additional parameters are used to correct the traditional coherence function model, which overcomes the structural response calculation error caused by the pulsating wind correlation. In order to facilitate the application of the project, the improved model is simplified under the condition of meeting the precision requirements. Based on the improved coherence function model, the joint acceptance function in large-span bridge vibration analysis is calculated. The results show that the computational error of the joint acceptance function based on the improved coherence function can be reduced by about 35% compared with the traditional method.