在结构动力学和随机振动理论基础上,推导结构脉动风总响应和等效静风荷载(ESWLs)的真实组合公式,提出用于补偿背景和共振交叉项的一致耦合方法来求解结构的风致响应和ESWLs。用一悬臂结构的经典算例验证本文程序的正确性;并以大跨度空间结构为例,采用CCM方法以及改进的三分量方法进行风致响应和ESWLs计算,通过与全模态CQC精确结果进行对比分析,揭示三层耦合项的参与机理。研究结果表明:本文方法精度高,对求解此类结构风致响应和ESWL有效。
A new approach to analyzing wind-induced response and corresponding equivalent static wind loads(ESWLs) was presented by consistent coupling method(CCM) approach based on structural dynamics and random vibration theory,which can compensate for the cross between background and resonant components.The correctness of CCM method was proved by the classic example of cantilever construction.Then,taking the long span spatial structure as an example,main characteristics of wind induced responses and equivalent static wind loads were analyzed with CCM.The calculation results were compared with precise results of CQC method,and the coupling term participation mechanism was studied.The results show that the proposed method has high precision and is efficacious to analyze the wind-induced responses and equivalent static wind loads.