Experimental And Numerical Simulation Of Prefabricated Composite Concrete-filled Steel Tube Frame With SPSW

Composite concrete filled steel tube structure is a new structure developed on the basis of traditional CFST structure.Compared with the traditional CFST structure,it owns higher bearing capacity and stronger seismic performance.And it has been widely used in practical engineering.At present,China has excess steel production capacity.Actively promoting steel structure construction can effectively solve such problems.Promoting assembly and industrialization of buildings will be the main development trend of future construction.This article combines prefabricated buildings and concrete-filled steel tubular buildings,and builds a composite steel tubular concrete frame which assembled in the middle part of columns.On this basis,adding steel plate shear walls in the frame to study the influence of steel plate shear walls on the seismic performance of such structures.And with the help of ABAQUS,studying the feasibility of this kind of structure and its continued development,and provide a certain basis for subsequent research.The main work of this article is as follows:(1)Double prefabricated CFST columns-steel plate shear wall frames which were building by 1/2 ratios are designed and subjected to pseudo-static tests.The control group is setting by owning a steel plate-free shear wall specimen or not,and the loading method is to apply axial force at the top of the column,and low cycle reciprocating load is applied in the plane direction.The comparative analysis of the failure process and the failure form of the test specimens shows that the failure forms and failure characteristics of the two frames are the same,but the existence of the steel plate shear wall greatly improves the failure displacement of the frame.(2)Based on the test results,the seismic performance parameters such as hysteresis curve,skeleton curve,ductility,energy dissipation capacity,and stiffness degradation of the two concrete frames were analyzed,and their restoring force models were established.The analysis results show that the steel plate shear wall can significantly improve the lateral stiffness,ultimate bearing capacity and energy dissipation capacity of the frame,but it has less effect on the ductility and stiffness degradation,and the overall seismic performance is more excellent.The feasibility of such a framework in actual working conditions is also discussed.(3)The ABAQUS software was used to set up a proportional model according to the test specimen,and a finite element analysis was performed.The finite element analysis results were compared with the test results.The results show that the obtained failure morphology,hysteresis curve,and initial stiffness are in good agreement with the test results.Verifying the correctness and rationality of the model.On this basis,the stress distribution of the inner and outer steel pipes and connecting components in the CFST column is further analyzed.The results show that the force transmission mechanism of such frames is clear,and the steel plate shear wall can dissipate seismic energy well and has good seismic performance.