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。
Abstract
A dynamic analytic framework of non-coaxial eccentric structures under wind loading is presented in this paper. Firstly, the dynamic equations of a two-storey non-coaxial eccentric structure with 6-degree-of-freedom (6DOFs) are set up. Secondly, the dynamic equations of a multistory (more than two-storey) non-coaxial eccentric structure are obtained via expanding those for a two-storey non-coaxial eccentric structure. Thirdly, based on the power spectra of the wind forces in along-wind, across-wind, and torsional directions, likewise considering both the intermodal coupling of modal response components and statistical correlation between across-wind and torsional loading, the analytic methodology of the wind-induced lateral-torsional coupled responses of structures with non-coaxial mass eccentricity are developed in the frequency domain. Eventually, taking example for the structure with 15 DOFs, the effects of non-coaxial stiffness eccentricity on the wind-induced lateral-torsional coupled responses are analyzed 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
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赵月梅 李春祥 于安琪 李锦华.
非同轴刚度偏心高层建筑平-扭耦合风振响应的研究[J]. 振动与冲击, 2013, 32(2): 86-96
Zhao Yue-mei Li Chun-xiang Yu An-qi Li Jin-hua.
Study on wind-induced lateral-torsional coupled responses of tall buildings with non-coaxial stiffness eccentricity[J]. Journal of Vibration and Shock, 2013, 32(2): 86-96
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