Finite Element Analysis Of Mechanical Performance Of U-shaped Double Steel Plate-concrete Composite Shear Wall

As more and more high-rise buildings used in frame-core tubular structures,shear walls become the most important part of the system.High-rise buildings have high requirements for the lateral resistance of the structure,including steel-concrete composite shear walls,so many different types of shear walls are produced.The steel-concrete composite shear wall combines the characteristics of the two materials,so that it has the characteristics of high lateral stiffness,good load carrying capacity,good ductility and high energy consumption.The outsourced multi-chamber steel plate can also be used as a formwork for pouring concrete and supporting the skeleton during construction,which greatly speeds up the construction progress.And the outer steel plate can provide certain constraints on the concrete and can also hinder the development of concrete cracks.At present,the research on steel plate-shear wall at home and abroad is not comprehensive and advanced,and there is not enough relevant research and calculation theory.This paper studies the mechanical properties of U-shaped double steel-concrete composite shear wall.A model is establised by using ABAQUS finite element software,and it to numerical analysis is carried out to study the failure mechanism and energy dissipation capacity of the combined shear wall under cyclic loading.The specific research contents of this paper are as follows:Firstly,the theory of damage model in ABAQUS is briefly discussed.In the nonlinear numerical simulation analysis of this type of shear wall,the modeling method of refined model is proposed based on ABAQUS,including the theory of concrete structure model,the theory of steel structure model and the determination of damage factors are also briefly discussed.Secondly,based on the existing pseudo-static test of double-steel-concrete shear wall with one-shaped shape,numerical model is established by ABAQUS,and the numerical simulation results are compared by the quasi-static test results.The feasibility of the model establishment is verified,and the beam model and the beamless model are studied.The reliability of the beamless model is verified,and the basis of the subsequent study on the mechanical properties of the U-shaped double steel-concrete shear wall is laid.Thirdly,the stiffness,bearing capacity,ductility and energy consumption of the combined shear wall are analyzed by changing the concrete strength grade,steel yield strength,axial compression ratio,steel plate thickness,wall thickness,web cavity number,shear span ratio and other parameters.Finally,through typical specimens,the failure mechanism of each characteristic point in the process of U-shaped double steel-concrete composite shear wall is summarized.