Study On Mechanical Behavior Of The Joints Between Double Skin Composite Shear Walls And Composite Slabs

Assembling steel structure construction has developed rapidly in recent years.It has many advantages such as light weight,good seismic performance and higher assembly rate.It is also gradually popularized in multi-high-rise civil buildings.Among them,the thin double steel plate shear wall(thickness <200mm)is an excellent lateral force resistance system,but the research on the connection node with the composite floor has been in an immature stage.This topic proposed four new type of double-plate combined shear wall and composite floor joint are proposed.Then,four kinds of experimental studies on pure bending,shearing,bending and quasi-static are carried out for two different joint forms,and the finite element simulation of static loading mode is carried out and 43 sets of parametric analysis are carried out.Finally,the bearing capacity formula of the joint under different forces is proposed,and the structure is optimized and improved in combination with the actual engineering.The pure bending test and finite element simulation of the three sets of joints were carried out,and the following conclusions were obtained: the specimens are the damage caused by the steel bar fracture near the loading point of the floor.It proves the feasibility of the new type of joint,and the way of connecting the steel bar through the shear wall to the floor is effective connection,which can smoothly transfer the tensile force of the steel bar and ensure the bearing capacity and ductility of the joint.At the same time,the ductility coefficient is greater than 4,and the limit rotation angle is greater than 1/10.The shear test and finite element simulation of the three sets of joints were carried out,and the following conclusions were drawn: the construction method of connecting new steel bars through the shear wall and the floor slab in the shear failure mode.The shear ductility coefficients of CVSA1202 and CVH130 are both greater than 4.The connection mode of the H-shaped steel beam can slightly increase the stiffness and bearing capacity of the joint domain.The H-shaped steel beam joint can be appropriately selected to improve the shear performance.The bending shear test and finite element simulation of the three sets of joints were carried out.The following conclusions were obtained: all the three specimens were bent and the ductility coefficients were all greater than 3.5,and the limit rotation angle was greater than 1/15.The connection mode of the H-shaped steel beam can improve the rigidity and bearing capacity of the edge joint.In static test,it is all in good agreement with the finite element.The quasi-static test of the two sets of joints were carried out.The conclusions are as follows: the specimens of both groups are bending failure,the S-direction ductility coefficients of N-direction and QSH130 are all greater than 4,and the limit rotation angle is greater than 1/15,which proves that the N-direction deformation ability of the joint domain is good and the ductility is excellent.The S-direction ductility coefficient of the test piece QSSA120 is 2.10.In actual engineering,appropriate structural measures can be taken to strengthen the node.The connection mode of Hshaped steel beam can improve the hysteretic capacity,energy consumption capacity and ultimate bearing capacity of the joint.Under the condition of ensuring the bearing capacity of the double-plate combined shear wall,the seismic design is recommended to use the H-shaped steel beam joint as the shear force.The wall and the floor are connected to the edge node.