基于双向耦合地震效应的隔震等效线性化方法研究

Study on the Equivalent Linearization Method of Seismic Isolation Based on Bidirectional Coupled Seismic Effect

单、双向地震动效应存在较多差异,现有的抗震设计方法忽略了地震波椭圆偏振强度的特性对双向地震动效应的影响,为此,文章建立双向耦合恢复力模型和多自由度单质点体系,用于分析结构在双向地震动作用下的响应,在此基础上进行深入研究,提出一种考虑双向耦合作用的等效线性化方法,并选取了4条实测地震波进行结构响应计算。结果表明:与经典等效线性化方法对比,基于双向耦合地震效应的隔震等效线性化方法合理,且具有一定的精度。

There are many differences between the single and bidirectional ground motion effects.The existing seismic design methods ignore the influence of the seismic polarization elliptical polarization characteristics on the bidirectional ground motion effect and lack the correlation of bidirectional seismic action.In this paper,a bidirectional coupled resilience model and a multi degree of freedom single structure system are established to analyze the response of structure under bidirectional ground motion.Based on this,a study is carried out to propose an equivalent linearization method considering bidirectional coupling.Then 4 ground motions are selected and the responses of structure are calculated.The results show that compared with the classical equivalent linearization method,the isolation equivalent linearization method based on the two-way coupled seismic effect is reasonable and has a certain accuracy.