| The square steel tube concrete combined special-shaped column frame structure system can hide the column limbs between the walls,avoiding the beam-column lobes,and can effectively increase the building use area,which has a good application prospect in the residential building field.The existing combined special-shaped column structure system includes a special-shaped column-frame system,a special-shaped column-support system and a special-shaped column-combined shear wall system.Among them,the special-shaped column-frame system is restricted by its lateral resistance,which is difficult to apply to high-rise buildings;the special-shaped columnsupport system has poor flexibility in supporting arrangements and has a narrow application range;the combined shear wall of the special-shaped column-combined shear wall system needs Pouring on site,the degree of assembly is low.In order to solve the above problems,this paper proposes a rectangular concrete-filled steel tube combined special-shaped column-buckling-resistant steel plate shear wall system suitable for high-rise and super-high-rise residential buildings.Experimental research is conducted on the seismic performance of the system,and based on theoretical analysis,The rational design proposal is to develop and improve the existing combined special-shaped column structure system.The content of this article is as follows:A new type of groove-connected special-shaped column-buckling-resistant steel plate shear wall is proposed,and three groups of 1:2 scale structural model test pieces are designed with the connection method as the parameter and a pseudo-static test study is performed.By comparing the hysteretic curve and skeleton curve of the four-sided,four-cornered and groove-connected test specimens,the loading capacity,stiffness degradation,strength degradation,and displacement ductility coefficient of the three test specimens are analyzed.Comprehensive evaluation of the seismic performance of the substructure.The test results show that the load-bearing capacity of the four-sided connection type specimen is outstanding,and the ductile connection type specimen has strong ductility and energy consumption.The system as a whole has good seismic performance.The ABAQUS finite element software was used to carry out a detailed numerical analysis of the special-shaped column frame-buckling-resistant steel plate shear wall system to obtain the hysteresis curve and skeleton curve of the structure,he stress mechanism and failure mode.The numerical analysis results are compared with the experimental results.The finite element analysis results agree well with the test results of the buckling-resistant steel plate shear wall,which indicates that the finite element model is reasonable.Based on the above finite element model,a parametric analysis is performed on the special-shaped column frame-buckling-resistant steel plate shear wall system.The analysis shows that the ultimate bearing capacity of the system decreases rapidly with the increase of the axial pressure ratio at high axial pressure ratios,and the axial pressure ratio of the system should not be greater than 0.7;the influence of changes in steel plate thickness and thickness of precast concrete slabs on the yield bearing capacity of the system Compared with the effect on the ultimate bearing capacity,the arrangement of the bolts has a greater impact on the deformation of the anti-buckling steel plate shear wall.Increasing the number of bolts can effectively suppress the deformation of the shear wall.Based on a large number of parameterized models,the restoring force model of the special-shaped column frame-buckling-resistant steel plate shear wall is fitted.It is verified by comparison that the model can reflect the loaddisplacement of the system under low-cycle reciprocating loads to a certain extent law.Finally,the results of the tests and finite element analysis are summarized,and the general design recommendations for the special-shaped column frame-bucklingresistant steel plate shear wall system in practical engineering applications are put forward with reference to relevant code recommendations. |
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