基于等效梁模型的大高宽比高层剪力墙隔震结构地震反应分析  

Seismic response analysis of base-isolated high-rising shear wall structure with large height-width ratio based on an equivalent beam model

作　　者：赖正聪[1,2] 潘文 白羽[1,2] 叶燎原 杨晓东[1,2] LAI Zhengcong;PAN Wen;BAI Yu;YE Liaoyuan;YANG Xiaodong(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China;Earthquake Engineering Researching Center of Yunnan,Kunming 650500,China;Yunnan Normal University,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省抗震工程技术研究中心,昆明650500 [3]云南师范大学,昆明650500

出　　处：《振动与冲击》2021年第20期127-134,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51368027);云南省教育厅基金(2020J0061)。

摘　　要：针对基础隔震高层剪力墙结构,建立了考虑隔震层边界的等效梁模型,提出了适用于该模型地震作用动力响应求解的振型分解反应谱法及有限元非线性时程分析法。以高宽比达3.96的实际结构缩尺模型为算例,采用上述两种分析方法求解其地震响应,并与三维有限元模型分析结果进行比较。结果显示:采用所建立的等效梁模型对基础隔震高层剪力墙结构地震反应进行分析具有较好的计算精度。可用沿结构高度均匀分布侧向力作用下、综合考虑弯剪变形影响的整体等效刚度EI eq作为等效梁的模型参数。可将该等效梁模型应用于高层隔震结构的普适性规律研究;高宽比达3.96的算例结构在8度罕遇地震作用下,显示出了良好的抗倾覆性能,结构以整体平动加轻微翻转摆动为主,水平侧移主要集中在隔震层。隔震支座尚处于受压状态,隔震层滞回曲线饱满、耗能显著。所建立的方法及相关分析结论,可为高烈度区大高宽比高层剪力墙基础隔震结构后续理论研究及实际工程应用提供有价值的参考。An equivalent beam model considering the boundary of the isolation layer was established for base-isolated high-rising shear wall structures with large height-width ratio.The mode decomposition response spectrum method and the finite element nonlinear time history analysis method were developed.The comparative analysis of dynamic response under earthquake with the above two analysis methods,taking the scaled model of an actual structural with the ratio of height to width of 3.96 as an example,was conducted.The results obtained were compared with 3D FEM analysis.The following conclusions have been obtained:High calculation accuracy can be obtained in seismic response analysis of base-isolated high-rising shear wall structure with large height-width ratio using the equivalent beam model.The equivalent beam model parameter EI eq,considering the influence of the bending shear deformation,can be determined by the static calculation under the action of the lateral force distributed uniformly along the height of the structure.The equivalent beam model can be applied to the study of the universal law of high-rise seismic isolation structures.The example structure with a height-width ratio of 3.96 shows good anti-overturning performance under the action of 8-degree rare earthquake.The structure vibrates in the way of overall translation and slight flip and swing,and the horizontal lateral movement is mainly concentrated in the isolation layer.The rubber bearings are still under pressure,and the hysteretic curves of the isolation layer are full,and energy dissipation is significant.The method and the conclusion of correlation analysis can provide valuable reference for the further theoretical research and practical engineering application of high-rise shear wall base-isolated structures with large height-width ratio in high intensity areas.

关 键 词：高层剪力墙结构 大高宽比 基础隔震 倾覆 等效梁 地震反应分析 

分 类 号：TU352.1[建筑科学—结构工程] TU355