非平稳随机地震作用下高层隔震结构平-扭耦合效应分析
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(上海建筑设计研究院有限公司, 上海 200041)[摘要] 将高层隔震不规则结构简化为考虑平-扭振动的多层刚片剪切模型，基于隔震支座的等效刚度和等效粘滞阻尼比建立了非平稳随机地震作用下单轴偏心结构的随机振动方程。采用状态空间法和虚拟激励法对振动方程进行了解耦和求解。对某34层高层隔震结构进行了算例分析，并对相关参数进行了研究，得到了一些有益的结论。研究表明，在随机地震作用下隔震层存在偏心对结构地震响应具有显著影响，会影响隔震层扭转反应，但不会削弱结构隔震效果；上部结构存在偏心对高层隔震结构上部结构的影响较大。[关键词] 高层隔震结构；非平稳地震；平扭耦合; 状态空间法；虚拟激励法中图分类号：TU352.1 文献标识码：A 文章编号：1002-848X(2013)S1-1226-04作者简介：王瑞栋，硕士，wangrd@siadr.com.cn。周 春，学士，教授级高工，zhouchun@siadr.com.cn。Effect of Lateral-torsion coupling on seismic response of High-rise isolated structureunder non-stationary stochastic seismicWang Ruidong，Zhou Chun(Shanghai Institute of Architectural Design and Research Co., Ltd, Shanghai 200041, China)Abstract: The high-rise isolated structure with large aspect ratio simplified as calculation model of multi rigid layers considering shearing and torsion was established. Based on equivalent stiffness and damping of isolation, the equation of motion of single-direction eccentric calculation model under non-stationary stochastic seismic was presented, and decoupling and solution of the equation of motion were obtained using state space method and pseudo excitation method. A 34-story high-rise isolated structure was calculated by parametric analysis. Results showed that the effect of isolation eccentricity on rotation of high-rise isolated structure was significant, and seismic isolation effect was weakened, but torsion responses of superstructure were not influenced. Seismic isolation effect was more influenced by superstructure eccentricity.Key words: high-rise isolated structure, non-stationary stochastic, lateral-torsional coupling, state space method, pseudo excitation method
