New L-Shaped Connector Double Steel Plate-Concrete Experimental Study On Hysteretic Performance Of Composite Shear Wall

In recent years,the double steel plate-combination shear wall as a new type of anti-lateral force member has good bearing capacity and good deformation and energy dissipation capacity.Based on the research of domestic and foreign scholars,this paper proposes an L-shaped The connection piece-double steel plate-concrete composite shear wall,and designed and produced 4 composite wall specimens,mainly to study the impact of the change of the shear span ratio and the length of the end column on the seismic performance of the composite wall.as follows:The low-cycle repeated load test was carried out on 4 pieces of L-shaped connector-double steel plate-concrete composite shear wall specimens,in which the parameters of the specimens were the shear span ratio and the length of the end column.The specimens of each wall are subject to typical bending failure under cyclic loading.Based on the obtained test data,the load-displacement hysteresis curve,skeleton curve,strength stiffness degradation curve and ductility consumption of each specimen are analyzed and obtained.Various indicators,such as energy capacity,the results show that the hysteresis curve shape of each specimen is relatively full,and the composite shear wall has good deformation energy dissipation capacity.With the increase of the length of the end column,the peak horizontal load of the wall decreased slightly.The initial stiffness and the degradation rate of the strength and stiffness did not have a significant effect.The degradation trends were approximately the same,and the ductility and energy dissipation capacity of each specimen increased to some extent.The reduction of the wall-to-span ratio of the wall increases its peak horizontal load and significantly increases its initial stiffness,but the rate of stiffness degradation accelerates,and the ductile energy dissipation capacity of the specimen is reduced.Analyze and compare the two methods of calculating the normal section flexural bearing capacity of double steel plate-concrete composite shear wall: full section plastic method and strain coordination method,and compare the theoretical calculation value with the experimental value,the results show that the two The values ??obtained by the calculation method are basically similar,which are less than the test value,but the full-section plastic method is more concise and clear,and is more convenient for future use.The finite element ABAQUS software was used to numerically simulate the four composite shear wall specimens,and the results of the model were compared with theoriginal test data.The two are relatively consistent and basically the same,which indicates that the finite element is used.The model established by the software can accurately simulate the seismic performance of the double steel plate-concrete composite wall under low-cycle repeated loads.