| Because of its excellent bearing capacity and seismic performance,the mixed structural system with steel and concrete composite frames and reinforced concrete(RC)shear walls has been widely used in high-rise and super high-rise building.However,the concrete-filled steel tubular(CFST)frame-reinforced concrete core wall structure system as one of the main form of hybrid structural system and its seismic performance research has important theoretical and practical significance.The article adopted the numerical simulation method to analyze and research the seismic performance of the Concrete-filled steel tubular frame-reinforced concrete core wall structure system,explored the elastic-plastic analysis method,cleared its failure mechanism,and provided reference for reasonable evaluate the seismic performance.The following several aspects had been done:(1)Based on the finite element software ABAQUS,the paper used the nonlinear fiber beam element in the numerical calculation of concrete-filled steel tubular column and frame,which is an important part of the hybrid structure system.Furthermore,the paper compared the calculated results and experimental results to verify the rationality of the modeling method and the constitutive model selection.(2)Based on the finite element software ABAQUS,the paper used the layered shell element in the numerical calculation of reinforced concrete(RC)shear walls,which is another important part of the hybrid structure system.The numerical simulation was carried out to simulate the one-way pushover tests of RC shear walls,the low-frequency cyclic loading tests of RC shear walls with CFST columns or steel reinforced concrete(SRC)columns and the pseudo static test of a two-layers and two-span mixed structure with CFST frame and composite shear walls,respectively.The horizontal bearing capacity(P)-displacement(?)skeleton curve and hysteretic curve had been obtained.The paper simulated the pseudo dynamic test of the two-layers and two-span mixed structure and got the acceleration time history curve.What's more,the paper compared the calculated results and experimental results,analyzed the failure modes of the composite shear walls,obtained the tested typical crack distribution of walls,and verify the effectiveness and rationality of the modeling method and the constitutive model selection while simulating the composite shear walls.(3)This paper designed a 30 storeys CFST frame-RC core wall hybrid structural system through the structural design and analysis software Midas Building developed by Beijing Midas company,calculated the steel components and composite components,obtained reinforcement information of reinforced concrete components,and carried out the modal analysis and the elastic time history analysis.Then,according to the design information of Midas,the paper established the fine finite element analysis model by ABAQUS software and carried out the modal analysis,the elastic time history analysis in frequent earthquakes and the elastic-plastic time history analysis in rare earthquakes.Furthermore,the paper obtained the structure's vibration modes,the dynamic response under ground motions(acceleration,velocity and displacement time history curves),and the maximum story displacement angle curves.Finally,the paper systematically analyzed the elastic-plastic development process of each component in different intensity and different kinds of seismic waves,especially the failure pattern and the damage development process of shear wall were studied. |
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