体育场挑篷结构多维地震随机响应分析

运用了多维虚拟激励随机振动分析方法,详细介绍了多维地震动随机模型的确定及其相关参数的选取.对济南奥林匹克中心体育场看台这一具有代表性的体育场挑篷结构进行了多维地震随机响应分析,给出了均值响应和峰值响应的评估方法,比较了挑篷结构在单向和多向地震动输入下的关键节点位移反应,计算结果表明,多维地震动会明显加大结构的响应.将虚拟激励法的计算结果与时程法的进行比较,两者的计算结果吻合较好.多维虚拟激励法作为一种高效的随机振动分析方法,为对大型体育场挑篷这类结构进行多维地震随机振动分析提供了有效的途径.

Random response analysis of stadium canopy roof under multiple earthquake excitations

In this paper, the pseudo excitation method was further improved and used for multi-dimensional random seismic analysis of a typical stadium canopy roof structure named Jinan Olympic Center. Theoretical formulations for multi-dimensional pseudo excitation algorithm were derived. A method of evaluating average peak responses was recommended. Seismic random models and parameters under multiple seismic ground motions were detailed introduced. The displacement responses of key nodes under single dimension and multiple dimensions were compared by calculating. The structure response under multi-dimension seismic input would be significantly magnified. The results of pseudo excitation method and the time history analysis were compared to verify the accuracy of multi-dimensional pseudo excitation method, and they were in good agreement. Multi-dimensional pseudo excitation method as an efficient random vibration analysis method provides an effective way to the field of random vibration analysis of large-scale stadium canopy roof structure.