多点风激励下高层建筑响应分析方法

Response analysis methods of highrise buildings under multipoint wind excitation

以高层建筑风振响应分析方法为研究对象,推导了CQC方法和SRSS方法的计算公式;同时,特别介绍了谐波激励法(HEM),并在虚拟激励法的基础上提出了一种新的算法——谱分解法(SDM)。将这些方法用于广州西塔风振响应分析中,结果表明:CQC方法是精确算法,但计算量大;SRSS方法计算效率高于CQC方法,但会损失计算精度;HEM方法占用内存少,计算效率高;SDM方法具有和CQC方法一样的精度,但计算效率更佳。通过精度和效率的对比分析,建议在高层建筑风振响应分析中优先采用HEM方法和SDM方法。

Taking the wind-induced response analysis method of tall building as research object,this study first derived the formula of CQC and SRSS methods and introduced the harmonic excitation method(HEM).Then,spectral decomposition method(SDM) was proposed as an extension of the pseudo excitation method(PEM).All these methods were adopted in obtaining the wind-induced response of Guangzhou West Tower.The comparison results show that:the CQC method is the most accurate method but it costs more computation time.With less numerical precision,the computation efficiency of SRSS is higher than the CQC method.HEM method is proven to be effective with less internal storage.The SDM method has the same precision as the CQC method,but its computation efficiency is much better.In view of better precision and computational efficiency,it is suggested that the HEM and SDM methods should be adopted in priority for the numerical analysis of wind-induced responses of tall buildings.