基于能量平衡的基础隔震结构地震响应预测及优化设计法研究  

Seismic response prediction and optimization design method for base isolated structure based on energy balance

作　　者：张云浩 李波[1] 严国虔 郑光益 鲍银鹏 ZHANG Yunhao;LI Bo;YAN Guoqian;ZHENG Guangyi;BAO Yinpeng(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《振动与冲击》2021年第17期32-40,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51208042)。

摘　　要：为了能快速准确地预测基础隔震结构隔震层响应的上限值,针对隔震层设置滞回型阻尼器的基础隔震结构建立地震能量平衡方程,根据等价往复滞回次数下限值经验公式提出考虑等价往复滞回次数降低的地震响应预测法。给出了预测式的推导过程,分析了阻尼量较大时等价往复滞回次数降低的现象,通过非线性时程分析验证了该预测法的准确性。分析了最优总剪力系数设计的剪力降低效果。利用总剪力降低率和位移降低率的线性组合构建优化设计目标函数,在此基础上提出能够考虑剪力和位移不同侧重需求的优化设计法。通过对6层钢框架基础隔震结构进行优化设计和时程分析验算,验证了优化设计法的可行性与高效性。Here,to quickly and accurately predict the upper limit value of isolated layer response of a base isolated structure,the seismic energy balance equation was established for the base isolated structure with hysteretic dampers set in its isolated layer.According to the empirical formula for the lower limit value of equivalent reciprocating hysteretic number,a seismic response prediction method considering reduction of equivalent reciprocating hysteretic number was proposed.The derivation process of the prediction formula was presented,and the phenomenon of equivalent reciprocating hysteretic number decreasing during larger damping was analyzed.The correctness of the prediction method was verified through nonlinear time history analysis.The shear reduction effect on the optimal total shear coefficient design was analyzed.The linear combination of the total shear reduction rate and the displacement reduction rate was used to construct the objective function of optimization design,and an optimization design method considering different requirements of shear and displacement was proposed.Through the optimization design and time history analysis for a 6-story steel frame base isolated structure,the feasibility and high efficiency of the proposed optimization design method were verified.

关 键 词：基础隔震结构 滞回型阻尼器 地震响应预测 能量平衡方程 等价往复滞回次数 优化设计 

分 类 号：TU352.1[建筑科学—结构工程]