| The development of high-rise prefabricated steel structure buildings is an effective way to realize construction industrialization and alleviate urban construction land shortage.Steel plate shear wall,support elements,and composite shear wall are often used as lateral resistance components in existing high-rise prefabricated steel structure system.Among them,the composite shear wall,especially the double-skin composite shear wall,has the characteristics of high bearing capacity,large lateral stiffness,good comfort,easy to meet the requirements of fire protection,and no template for concrete pouring.Therefore,it is more advantageous to use double-skin composite shear wall as a lateral resistance component in high-rise prefabricated steel structures,which is worthy of further research and application.In this dissertation,the seismic performance of a new type of truss stiffened double steel plate composite shear wall is studied through experimental research,finite element analysis and theoretical research.The main research work and achievements are as follows:(1)Based on the quasi-static tests of 10 full-scale double-skin truss-reinforced composite shear wall specimens,the failure mode,bearing capacity,ductility,stiffness and strength degradation,energy dissipation capacity and deformation capacity of the composite shear wall were studied.The test results show that the double-skin truss-reinforced composite shear wall has high bearing capacity,energy dissipation capacity and deformation capacity,and has good seismic performance.Then,the influence of axial compression ratio,height-width ratio,spacing-thickness ratio and section form on the seismic performance of such composite shear walls is analyzed.(2)Based on the test results,the finite element model of double-skin truss-reinforced composite shear wall was established.The failure process,failure mode,load-displacement relationship,initial stiffness and energy dissipation index of the double-skin truss-reinforced composite shear wall were simulated and verfied.Then the shear working mechanism of the composite shear wall was analyzed,and the finite element parametric analysis was carried out on the factors such as axial compression ratio,aspect ratio,truss spacing to thickness ratio,truss connector specification and section form.(3)Based on the section stress analysis and superposition principle,the shear bearing capacity calculation formula of double-skin truss-reinforced composite shear wall was established.The verification of test results show that the formula have high accuracy.The formula can be used to calculate the shear bearing capacities of the double-skin truss-reinforced composite shear walls.(4)Based on the experimental data,finite element analysis results and theoretical analysis,the restoring force model,composite strip model and equivalent truss model of the double-skin truss-reinforced composite shear wall were established.The verification results show that the models have high accuracy,which can provide a certain reference for the macro analysis and the simplified analysis of this kind of composite shear wall.(5)Based on the research results and the relevant standards,the design suggestions of double-skin truss-reinforced composite shear wall were given in terms of bearing capacity calculation,axial compression ratio limit,truss spacing to thickness ratio limit,and structural requirements of truss connectors.Taking a practical project as an example,the application of truss stiffened double steel plate composite shear wall was introduced,which can provide a certain reference for the design and promotion of double-skin truss-reinforced composite shear wall. |
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