索网点式幕墙在主体结构多点激励下地震响应分析方法探讨  

DISCUSSION ON THE ANALYSIS METHOD OF THE SEISMIC RESPONSE OF POINT-SUPPORTED FACADE WITH MULTI-POINT INPUT OF RIMARY STRUCTURE

作　　者：石永久[1] 李勇[1] 王元清[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084

出　　处：《工程力学》2010年第11期40-45,共6页Engineering Mechanics

基　　金：KGE研究基金项目(200303)

摘　　要：针对主体结构对单层索网点式玻璃幕墙地震响应的影响,指出了主体结构二次地震输入的纵向空间变异性,进而提出考虑主体结构影响的单层索网玻璃幕墙的地震响应分析方法,即多点激励联合法,并从理论及有限元算例分析上验证了其可行性和必要性。利用多点激励联合模型,在假设二次输入数学模型基础上,研究了主体结构二次输入参数对索网动力响应的影响,及阻尼对索网幕墙地震响应的影响,并得出结论:主体结构位移输入幅值和层间转角较大,或输入主频接近索网基本频率时,主体结构对索网幕墙位移影响较大。最后利用此方法进行算例分析对主体结构的影响大小进行了初步估计,为实际工程中索网幕墙的抗震设计提供参考。Considering the effects of primary structure on the seismic response of the point-supported glass wall with single-layer cable net, the method to analyze its seismic response under vertical multi-point excitation of primary structure is proposed. It combined the input method with multi-point excitation, with theoretical and numerical validation, to consider the effects of primary structure on the seismic response. With this method and the assumptive model for second input, the effects of three parameters of second input and damp were investigated in the seismic response analysis, concluding that the effects of primary structure on cable net will be more prominent with the increase of input and storey drift, as well as the decrease of their difference in basic frequency. In the end, the proposed method was applied to several examples to imply the contribution of primary structures to the seismic response, which can serve later practical design of similar cable net glass wall.

关 键 词：单层索网玻璃幕墙 主体结构 多点输入 联合激励法 二次输入 

分 类 号：TU311.3[建筑科学—结构工程]