非同轴刚度偏心高层建筑平-扭耦合风振响应的研究  

Wind-induced lateral-torsional coupled responses of tall buildings with non-coaxial stiffness eccentricity

作　　者：赵月梅[1] 李春祥[1] 于安琪[1] 李锦华[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《振动与冲击》2013年第2期86-96,共11页Journal of Vibration and Shock

摘　　要：提出了分析非同轴刚度偏心结构风振响应的基本框架。第一,建立了两层6个自由度(6DOFs)非同轴刚度偏心结构的动力方程。第二,将建立的动力方程扩展至多层(大于两层)非同轴刚度偏心结构情况。第三,基于顺风向、横风向及扭转风荷载功率谱,并考虑横风向与扭转风荷载间相关性及模态响应间耦合,建立了非同轴刚度偏心结构风致平-扭耦合响应的分析方法。最后,以15DOFs结构为例,通过设置结构不同刚度偏心,数值研究了非同轴刚度偏心对结构风致平-扭耦合响应的影响。A dynamic analysis framework of non-coaxial eccentric structures under wind loading was presented here. Firstly, the dynamic equations of a two-storey non-coaxial eccentric structure with 6-DOF were set up. Secondly, the dynamic equations of a multi-storey non-coaxial eccentric structure were obtained via extending those of a two-storey non-coaxial eccentric structure. Thirdly, based on the power spectra of wind forces in along-wind, across-wind, and torsional directions, considering both intermodal coupling of modal response components and statistical correlation between across-wind and torsional wind loading, the analysis methodology for wind-induced lateral-torsional coupled responses of structures with non-coaxial mass eccentricity was developed in frequency domain. Eventually, taking a structure with 15- DOF for example, the effects of non-coaxial stiffness eccentricity on its wind-induced lateral-torsional coupled responses were analyzed numerically through selecting different locations of stiffness eccentricity.

关 键 词：非同轴刚度偏心 偏心结构 风致振动 耦合动力分析 

分 类 号：TU311[建筑科学—结构工程]