Experimental Study On Seismic Performance Of Double Steel Plate Combined Shear Walls With Different Shear-span Ratio

With the deepening of reform and opening up,people’s demand for housing is constantly improving,and the state has put forward the building requirements of building energy saving,low carbon and green ecology.As a double lateral force resistance system,steel plate composite shear wall has attracted wide attention from experts and scholars at home and abroad because of its high bearing capacity and good ductility.In this paper,based on the research results of experts and scholars at home and abroad,the quasi-static test of double steel plate composite shear wall and finite element simulation are used to analyze its seismic performance.The following contents are studied:（1）A low cycle loading test was carried out on the composite wall of two steel plates with three pieces of L tensioner,The seismic performance and failure mode of double steel plate composite shear wall with different shear span ratio are explored.Based on the experimental data,The skeleton curve,hysteretic curve,stiffness and strength degradation curve,cumulative energy dissipation curve,The energy dissipation,ductility,hysteretic behavior and bearing capacity of the composite wall are analyzed.The final results show that :1.With the reduction of shear-span ratio of composite wall,the fullness of hysteretic curve decreases,and more slip effects are produced,but in general,the hysteretic curves of each specimen are full,showing superior energy dissipation capacity;2.The maximum load and initial stiffness of the composite wall increase gradually with the decrease of shear span ratio,But in the destruction phase,The lower the shear-span ratio,The faster the stiffness degrades;3.As the shear-span ratio of composite walls decreases,Its cumulative energy consumption is reduced,Reduced energy dissipation capacity;4.The ductility of composite wall becomes worse with the decrease of shear-span ratio;5.In terms of destruction patterns,The composite wall with medium and high shear span ratio presents bending failure,The composite wall with low shear span ratio presents bending shear failure;6.The strain of the L-shaped tensioner is analyzed,It shows that it has better binding effect,Good mechanical performance.（2）Three double-plate composite walls with different shear-span ratios were simulated by ABAQUS finite element simulation software,and the experimental results were compared.The results show that there are some differences between the experimental results and the numerical simulation results,but they are basically consistent.Finally,the reasons for the difference are analyzed to verify the accuracy of the simulation.（3）Based on the known accuracy of finite element simulation,the finite element model is established by selecting the parameters such as the spacing,concrete strength and steel plate strength of the L-shaped tensioner,and the influence of these parameters on the mechanical properties of the double steel plate composite wall is analyzed.The results show that :1.the mechanical properties of the composite wall can be improved by decreasing the spacing of the tensioner properly;2.with the increase of concrete strength,the peak load and initial stiffness of the composite wall are improved,but the lifting amplitude is small;3.with the increase of steel plate strength,the peak and initial stiffness of the composite wall are greatly improved.