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采用力-位移混合控制方法,提出了考虑倾覆力矩的子结构混合模拟试验方法。采用ANSYS有限元软件,进行了不同的加载分布方式、试验子结构刚度发生变化、不同梁柱线刚度比以及不同结构层数等情况下的数值模拟,初步验证所提方法的可行性。以6层钢框架模型为例,实现了考虑倾覆力矩情况下的子结构混合模拟试验。试验结果表明:不考虑界面倾覆力矩,将改变结构在地震作用下的内力分布和破坏模式,不能真实地反映结构在地震作用下的力学性能。
Using the force-displacement hybrid control method, a substructure hybrid simulation test method considering the overturning moment is proposed. ANSYS finite element software was used to verify the feasibility of the proposed method through different numerical simulations under different load distribution patterns, changes in the stiffness of the test sub-structure, stiffness ratio of different beam-columns, and the number of different structural layers. Taking the 6-story steel frame model as an example, substructure hybrid simulation test considering the overturning moment is realized. The experimental results show that, without considering the overturning moment of the interface, the internal force distribution and failure mode of the structure under seismic action will be changed, which can not truly reflect the mechanical properties of the structure under earthquake action.