基于等效线性化隔震结构设计周期折减系数研究  

Period reduction coefficient of isolation structures based on the equivalent linearization method

作　　者：张龙飞 舒瑞 周宴民 郭平宗 ZHANG Longfei;SHU Rui;ZHOU Yanmin;GUO Pingzong(College of Architecture and Civil Engineering,Kunming University,Kunming 650214,Yunnan,China;Institute of Engineering Earthquake Resistance and Disaster Reduction,Kunming University,Kunming 650214,Yunnan,China;Yunnan Branch of W&R Architectural Design&Planning Co.,Ltd.,Kunming 650224,Yunnan,China;Yunnan GOWE Machinery&Technology Co.,Ltd.,Kunming 650032,Yunnan,China)

机构地区：[1]昆明学院建筑工程学院,云南昆明650214 [2]昆明学院工程抗震减灾研究所,云南昆明650214 [3]上海水石建筑规划设计股份有限公司云南分公司,云南昆明650224 [4]云南国为机械科技有限公司,云南昆明650032

出　　处：《地震工程学报》2024年第2期294-301,共8页China Earthquake Engineering Journal

基　　金：云南省地方高校联合专项(202101BA070001-080);云南省2023年度标准化研究项目(2023BZHXM09);昆明学院引进人才科研项目(YJL20026)。

摘　　要：《建筑隔震设计标准》提出的隔震设计是基于复振型分解反应谱等效线性化的一体化直接设计方法,但未提及隔震结构周期折减系数如何取值。基于此,根据刚度串联关系推导等效单自由度隔震体系周期折减系数简化计算公式,探讨隔震结构周期折减系数因素的影响规律,建立不同填充材料、不同填充率的有限元数值模型,并利用数值模拟结果验证隔震结构周期折减系数简化计算公式。结果表明:隔震结构周期折减系数与名义周期比、非隔震结构周期折减系数存在函数关系;墙体开洞与通高墙体的隔震结构的周期折减系数均随着填充率的增大而减小,当填充率相同时,呈现出随填充材料弹性模量增大而减小的趋势,墙体开洞会增大隔震结构周期折减系数,且隔震结构的周期折减系数的取值范围相对较窄,为0.915~0.965;数值有限元模拟与理论结果偏差小于3%,吻合度高,以验证隔震结构周期折减系数简化计算公式的正确性,说明该简化计算方法对隔震工程设计具有一定指导意义。The isolation design method,which is proposed in the Standard for Seismic Isolation Design of Building,is an integrated design method based on the equivalent linearization of the complex mode decomposition response spectrum.However,this method does not specify how to determine the period reduction coefficient of the isolation structure.Therefore,according to the stiffness series relationship,a simplified calculation formula for the period reduction coefficient of the equivalent single-degree-of-freedom isolation system was derived,and the influencing factors of the period reduction coefficient of isolation structures were discussed in this paper.Numerical finite element models with different filling materials and rates were established,and the accuracy of the simplified formula was verified.Results show that a functional relationship exists between the period reduction coefficient of the isolation structure,the nominal period ratio,and the period reduction coefficient of the non-isolation structure.As the filling rate increases,the period reduction coefficient of the isolation structure decreases.For the same filling rate,the period reduction coefficient of the isolated structure decreases with the increase in the elastic modulus of the filling materials and increases with the wall opening.The range of the period reduction coefficient of the isolation structure is 0.915-0.965.The deviation between the numerical simulation and theoretical analysis results is less than 3%,thereby proving the accuracy of the simplified formula.The simplified calculation method of the period reduction coefficient has a certain guiding importance for the design of isolation engineering.

关 键 词：隔震设计 一体化直接设计法 周期折减系数 简化计算公式 数值有限元分析 

分 类 号：TU352.1[建筑科学—结构工程]