高层建筑风振响应参与模态分析

PARTICIPANT MODE ANALYSIS OF WIND-INDUCED RESPONSES OF HIGH-RISE BUILDING

根据一实际超高层建筑风洞试验数据结果,采用频域分析法计分析和探讨计算超高层建筑风振响应时应考虑的结构模态数和频率范围,得到强风作用下该超高层建筑均方根位移与内力响应随参与计算的模态数和频率范围的变化规律,同时从该超高层建筑表面测点风压谱密度的角度解释了这种变化规律。

The mode number and the frequencies range, which were considered during calculating the wind-induced responses of large cantilevered roof by using the method of frequency domain, were analysed and discussed, according to the results of wind tunnel tests of a high-rise building, and the rules that RMS displacement and RMS internal force responses under strong wind force changing with participant modes number and frequencies range were obtained,and which could be explained from the point of wind pressure power spectrum densities of the measured points on surface of the building.