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为了探讨多层双向偏心结构在弹塑性阶段平扭耦联变化规律,建立了带有双向抗侧力构件的多层双向偏心结构空间简化剪切模型.利用MATLAB编程和非线性静力分析方法探讨了3层双向均匀偏心框架结构在整个加载过程中的结构频率变化规律.结合由非线性静力分析得到的结构等效层恢复力模型,展开了多层双向偏心结构前3阶频率随扭平频率比和偏心率从弹性阶段到弹塑性阶段整个过程中的参数分析.分析结果表明:弹塑性阶段平扭耦联参数变化规律明显不同于弹性阶段;结构弹塑性发展的不同程度对频率随参数的变化规律有明显影响;结构弹塑性的发展削弱了扭平频率比和偏心率对频率的影响.
In order to investigate the change of translational torsional stiffness of multi-layer biaxially-eccentric structure during the elasto-plastic phase, a simplified shear model of multi-layer bi-directional eccentric structure with bi-directional anti-side force components was established. The programming and nonlinear static analysis The structural frequency variation of three-layer bi-directional uniform eccentric frame structure during the whole loading process was studied.With the restoring force model of structural equivalent layer obtained by nonlinear static analysis, Frequency ratio and eccentricity from the elastic phase to the elastic-plastic phase.The analysis results show that the variation of the coupling parameters of the elastic-plastic phase is obviously different from that of the elastic phase.The elastic- The change of structure has a significant impact on the structure of the elastic-plastic development weakened the kink frequency ratio and eccentricity on the frequency of impact.