Study On Seismic Behavior Of Steel-Damping-Concrete Composite Shear Wall

The double steel plate-concrete composite shear wall is a structural system composed of two-sided steel plates and a core concrete,which fully utilizes the mechanical properties of the steel plates and concrete materials.It exhibits excellent performance such as high strength,good ductility,and fast construction.In recent years,this type of wall has been widely used in the design of residential buildings and nuclear power plant structures.This study investigates the seismic performance of a non-welded bolts connection steel-damping-concrete composite wall.The composite shear wall utilizes sleeve bolts with inner lining plates to connect the tension side steel plate and simultaneously enhance the restraining effect of the lining plates on the core concrete.By utilizing the shear deformation and high damping characteristics of the damper material,controlled slip between the steel plate and concrete section is achieved to improve the inplane seismic performance of the shear wall.The design uses a sleeve bolt to connect the tension-side steel plate with a lining plate,while also strengthening the constraint effect of the lining plate on the core concrete.The shear deformation of the damping material and its high damping capacity enable controlled sliding between the steel plate and the concrete section,improving the in-plane seismic performance of the shear wall.Based on the quasi-static tests of seven damping interlayer steel plate-concrete composite shear wall specimens and finite element modeling calculations,this study investigates the shear behavior of the damping interlayer steel plate-concrete composite shear wall.The main research content and results are as follows:(1)The effects of interlayer thickness,spacing of constrained rods,shape of the constrained column at the end,and axial compression ratio on the seismic performance of the specimens were investigated.The results show that the damping interlayer reduces the direct constraint effect of the steel plate on the concrete,but the sleeve bolt connection of the lining plate can effectively enhance the constraint effect of the concrete while avoiding initial defects in the steel plate.The presence of the damping interlayer improves the buckling performance of the steel plate.The composite shear wall has high bearing capacity and ductility,indicating excellent seismic performance.Within a certain range,increasing the thickness of the damping interlayer can improve the ductility of the specimen,but the bearing capacity decreases slightly.Reducing the spacing of the constrained rods can effectively prevent outward buckling of the steel plate,thereby improving its ductility.However,excessive spacing can lead to increased internal defects in the core concrete,which reduces the bearing capacity of the specimen.Using square steel tubes as constrained columns at the end can increase the ultimate bearing capacity of the specimen.As the axial compression ratio increases,the stiffness,bearing capacity,and ductility of the specimen first increase and then decrease.The comprehensive performance of the specimen is better at an axial compression ratio of 0.3.(2)The numerical model of the steel plate-concrete composite shear wall specimen was established using ABAQUS finite element software,and the bearing capacity and failure mode of the specimen were calculated.The effects of axial compression ratio,interlayer thickness,spacing of constrained rods,concrete strength,and steel strength were analyzed.The parameter analysis shows that when the design axial compression ratio n is between 0.1 and 0.4,the axial compression ratio has little effect on the bearing capacity,deformation capacity,and ductility of the specimen.When the axial compression ratio exceeds 0.4,the bearing capacity,deformation capacity,and ductility of the specimen decrease with increasing axial compression ratio.Increasing the thickness of the damping interlayer will decrease the bearing capacity of the shear wall,but it will improve the ductility of the specimen to some extent.Shortening the spacing of the constrained rods helps to improve the ultimate bearing capacity of the specimen.The bearing capacity of the specimen is positively correlated with the concrete strength and steel strength.(3)Based on the test results and finite element model calculations,and taking into account the combination of each part of the steel plate-concrete composite shear wall,the shear carrying capacity formula of the single steel plate-concrete composite shear wall in the specification was modified to apply to the steel plate-concrete composite shear wall with a damping interlayer.The modified formula provides a reasonable estimation of the shear carrying capacity of the damping interlayer steel plate-concrete composite shear wall.The research results provide a reference for the design and engineering applications of the damping interlayer steel plate-concrete composite shear wall.