Study On Seismic Behavior Of Concrete Filled Steel Tubular Frame With External Composite Wallboard

In recent years,with the comprehensive promotion of China's construction industrialization,the research on prefabricated construction has become the focus of scholars.While many research results have been achieved,the anti-seismic problem of envelop enclosure in prefabricated construction still needs further study.External composite wall panel is one of the important forms of fabricated construction envelope system.The antiseismic design of its connection with the main frame has not formed a unified mature theoty and norm yet.Therefore,it is necessary to conduct a large number of experiments and theoretical studies on the anto-seismic performance of the structure system.In this paper,the anti-seismic performance of CFST column frame with external wall panels will be studied from three aspects: experimental study,numerical analysis and theoretical analysis.The main research work is as follows:(1)Carry Pseudo-static tests on 3 CFST column frames with external composite wall panel and 2 CFST column frames without wall panel.The failure modes,hysteretic behavior,stiffness degradation,strength degradation,ductility coefficient,energy dissipation capacity,strain and displacement variation of important parts of the structure system will be analyzed,and the anti-seismic performance of the structure system will be evaluated comprehensively.(2)Using the finite element analysis software ABAQUS to model and analyze the concrete filled steel tubular column frame with external composite wall panel,the mechanical characteristics and failure mechanism of the frame under test load are studied.The validity and accuracy of the simulation calculation are verified by comparing with the experimental results.At the same time,the parametric analysis is carried out,and the influence law of material parameters and geometric parameters on the structural is studied.(3)Based on the theoretical design and experimental results,analyse the displacement mode of external wall panels and the stress of upper joints,and compare the differences between experimental results and theoretical design.The results show that the flexible fourpoint support between the external wall panel and the main structure can effectively control the displacement mode of the wall panel,and the horizontal restraint degree of the upper joint connectors plays a decisive role in the displacement mode of the wall panel.