Finite Element Analysis Of Mechanical Performance Of L Type Double Steel Plate Concrete Composite Shear Wall

Frame-core tube structure system is widely used in high-rise buildings in China.Shear wall is the most important lateral resistance component of core tube.However,with the increase of building height,the traditional reinforced concrete composite shear wall has some shortcomings in bearing capacity and seismic performance,so optimizing the structural form of shear wall becomes the key to the development of super high-rise buildings.To solve this problem,scholars at home and abroad put forward the double steel plate concrete composite shear wall,which can give full play to the advantages of the two materials,and exert good bearing capacity and energy dissipation capacity under vertical and lateral forces.In this paper,a special-shaped member,i.e.L-shaped double steel plate-concrete composite shear wall is proposed on the basis of its one-zigzag double steel plate-concrete composite shear wall.In view of the lack of relevant research and design methods of L-shaped double steel plate-concrete composite shear wall,this paper mainly studies the mechanical properties and energy dissipation capacity of the member,including the following specific contents:(1)Based on the existing experimental study of a double steel sheet-concrete composite shear wall,ABAQUS is used to model and analyze the related components.The simulation results are compared with the experimental results,and the appropriate constitutive relations of concrete and steel are selected and the parameters are determined.This study is carried on the basis of the correct and effective modeling methods which is obtained through the comparison of two experimental results.(2)A large number of parameterized analysis of L-shaped double-plate-concrete composite shear wall is carried out.The main parameters include concrete strength,steel plate strength,steel plate thickness,axial compression ratio and width-thickness ratio.A total of 29 finite element models were designed,and the influence of different parameters on the mechanical properties and energy dissipation of shear walls was summarized based on the calculation results.(3)In order to understand the mechanics of L-shaped double steel plate-concrete composite shear wall,the author studied the stress process of foundation specimens,including crack point,yield displacement point,peak bearing capacity point,failure load point,stress-strain state of steel plate and concrete at each characteristic point.And the interaction between them is analyzed and introduced in detail.The results show that the web has a large force,so the concrete strength grade and steel strength grade should be increased.In addition,if the actual project needs,the end column size can be increased to enhance the bearing capacity of the shear wall.