Seismic Behavior Of Constrained Double-steel Concrete Composite Shear Wall

The double-steel-concrete composite shear wall structure combines the mechanical properties of steel and concrete materials,and has good bearing capacity,good ductility,large lateral stiffness and high energy consumption,but at high axial pressure ratio.Seismic performance is significantly reduced.In order to improve its performance,this paper proposes a "constrained double-steel concrete combined shear wall" structure.The combined shear wall introduces the concept of the steel-concrete-concrete concrete column into the common double-steel-concrete composite shear wall,that is,the outer steel plate is cut and a gap of a certain width is reserved at the intersection of the shear wall top and the floor of each layer.The outer steel plate does not directly bear the vertical load,but only plays the role of restraining the concrete inside.The vertical load is all borne by the concrete filled.Based on ABAQUS finite element software,a constrained double-steel concrete composite shear wall model was established,and its finite element simulation analysis was carried out to study its seismic performance,which provided theoretical basis for its engineering application.The content of this article mainly includes the following points:1.Using the finite element software ABAQUS,the same finite element model as the double-steel-concrete composite shear wall model in the existing test is established.Under the same force,the initial stiffness and yield load of the finite element model and the test wall are The maximum error of peak load capacity is within the acceptable range,which verifies the feasibility of finite element software ABAQUS to simulate the seismic performance of double-steel concrete combined shear wall structure.2.A finite element software ABAQUS was used to establish a common double-steel-concrete composite shear wall and four confined double-steel-concrete composite shear wall models with different gap widths to compare the seismic performance of two combined shear walls.The influence of different width gaps on the seismic behavior of the constrained double-steel concrete composite shear wall is analyzed.The results show that under the high axial compression ratio,compared with the ordinary double-steel concrete combined shear wall,the constrained double steel plate The bearing capacity,ductility and energy consumption capacity of the concrete composite shear wall have been greatly improved,and it is an excellent structure that can improve the seismic performance of the double-steel concrete combined shear wall.It is determined that the optimal slit width of the constrained double-steel concrete composite shear wall at the high axial compression ratio(n=0.5)is 3% of the height of the outer steel plate(81 mm).3.In order to optimize the parameters of the constrained double-steel concrete combined shear wall,the ABAQUS software was used to establish two types of double-steel-concrete composite shear wall finite element model(constrained type(slotted 81mm)and common type),with axial compression ratio,aspect ratio,steel plate strength grade as research parameters,combined with hysteresis curve,skeleton curve,bearing capacity,deformationcapacity,ductility and energy consumption,etc.,to study and compare the seismic performance differences and constraints of two shear walls The combined double-steel concrete shear wall is affected by the change of parameters.The results show that the seismic performance of the constrained type is better than that of the ordinary double-steel concrete combined shear wall,especially the seismic performance under high axial compression ratio is still good,which reduces the ductility and energy consumption of the common composite shear wall.The sensitivity of the pressure ratio.The axial compression ratio,the strength of the outer steel plate and the aspect ratio have a great influence on the seismic performance of the restrained double-steel concrete combined shear wall.4.Establish a "multi-cavity constrained double-steel concrete combined shear wall" model,and change the single-cavity aspect ratio(ie the number of cavities)to study the failure mode,bearing capacity and hysteresis of the combined shear wall.Back curve,skeleton curve,ductility,stiffness degradation and energy consumption.