| The steel plate shear wall(SPSW)is composed of web plate,vertical boundary elements and horizontal boundary elements.Linked by coupling beams,two steel plate shear walls compose the coupled steel plate shear walls(CSPSW).Due to the link effect of the coupling beams,two adj acent SPSWs can work together to improve the structural resistance performance.In this paper,vertical boundary elements of coupled steel plate shear walls were concrete-filled square steel tubes,and the introduction of concrete-filled square steel tubes could fully develop the post buckling behavior of steel plate shear walls.On the other hand,grid stiffeners were set on the steel plate shear walls,which can effectively reduce the tremor and noise of the web plate,and can also effectively restrain the outer deformation of the web plate,improve its strength and energy dissipation.Experimental research and numerical analysis are used to study the seismic performance of CSPSW structure.The research includes the following aspects:(1)A cyclic loading test was performed on a 3-story,3-span CSPSW with scale of 1/3.The seismic performance of the CSPSW was studied.The experimental results demonstrate that the structure has good bearing capacity,ductility,energy dissipation,and excellent seismic performance.The web plates and the steel coupling beams dissipate seismic energy by their own plastic deformation,and then the end of the horizontal boundary elements forms the plastic hinge.Finally,the specimens failed due to the development of plastic hinges at column base.It meets the design concept of "strong piers,weak components",the aim of multiple seismic resistant system was achieved.(2)The finite element software ABAQUS2017 was used to perform nonlinear numerical simulation on the test specimens.The performance indexes of the finite element simulation are compared with the test results.The results show that the finite element results are in good agreement with the test results.It can fully reflect the hysteresis performance and failure mode of the specimen.It shows that this analysis method can better simulate the seismic performance indexes of the CSPSW with grid stiffeners under a cyclic loading,which verified the validity of the finite element modeling method.Combined with the test and finite element analysis results,the stress-strain development process of the specimen was analyzed,and the failure mode of structure were obtained.(3)Using finite element method,full-scale CSPSW model was established.The impact of the web and flange thickness of steel coupling beams,stiffening form of steel plate shear wall and the axial compression ratio on the mechanical performance of CSPSW with grid stiffeners was studied.The results show that increasing the web thickness of the steel coupling beam can effectively improve the strength,stiffness and energy dissipation of the structure,while the thickness of the flange of the steel coupling beam has little effect on the performance of the structure.With the increase of the stiffening density of web plate,the strength and energy dissipation of the structure also increase.The axial compression ratio has less influence on the stiffness,and the increase of axial compression ratio will decrease the strength and energy dissipation.(4)According to the principle of degree of coupling.Changing the coupling beam section,the horizontal boundary elements section and the span of the steel plate shear wall,different degree of coupling(DC)were obtained.The influence of DC on the CSPSW is studied.The results show that the DC has influences on the strength,stiffness and energy dissipation of the CSPSW.In order to ensure that the structure has a good energy dissipation.It is recommended that the optimal DC of the CSPSW with grid stiffeners is 0.50. |
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