Finite Element Analysis Of Mechanical Properties Of L-shaped Multi-cavity Concrete Filled Steel Tubular Composite Shear Wall

Shear Walls are commonly used in high-rise buildings lateral force resisting member.in addition to considering the structure to bear vertical loads,we should also consider the effect of wind and seismic loads and other horizontal loads in high-rise buildings.Wth the advancement of urbanization,the building height is getting higher and higher.As an important component in the structural system,the shear wall has higher requirements on the seismic performance of the shear wall.Multi-cavity steel concrete composite shear wall is a new structure.The effective combination of steel tube and concrete gives full play to their respective advantages and makes up for their shortcomings,which has good mechanical properties.L-shaped shear wall is a common structural form.This paper proposes a new 1-shaped multi-cavity concrete-filled steel tubular composite shear wall based on shaped section.The research contents are as follows:Adopting reasonable modeling method by ABAQUS finite element simulation software,establish a multi-cavity shaped shear wall finite element model were compared with the literature experimental data.According to the results of the comparative analysis of failure modes,bearing capacity characteristic points and stress cloud map of the specimens,the validity of this modeling method is verified.On this basis,the subject research of L-shaped multi-cavity composite shear wall can be carried out.The finite element simulation software ABAQUS was used to establish the L-shaped multi-cavity concrete filled steel tubular composite shear wall model,and the force mechanism and failure modes of the shear wall were studied through the cyclic loading of the standard model members.From the results of numerical simulation can be found:L-shaped multi-cavity concrete filled steel tubular composite shear wall first reaches the failure state when it is negatively loaded in the process of cyclic loading,and finally,the steel tube at the corner of the wall limb in the loading direction buckled,the concrete was damaged and crushed,and the concrete at the bottom of the wall limb in the non-loading direction was crushed and damaged.The overall perfonnance of shear wall is bending failure,the structure has a good ductility and energy dissipation capacity,there will not be sudden stiffness degradation and failure.In this paper,14 L-shaped multi-cavity concrete filled steel tubular composite shear wall models in 5 groups were parameterized analyzed to study the influence of axial compression ratio.concrete strength grade,steel strength,steel tube thickness and height-width ratio on seismic performance of L-shaped multi-cavity concrete filled steel tubular composite shear wall.The results show that the increase of axial compression ratio of shear wall can slightly improve the positive bearing capacity and initial stiffness of L-shaped shear wall,but reduce the negative bearing capacity and ductility of shear wall obviously,and have no effect on the energy dissipation capacity of the structure;the increase of concrete strength grade can also slightly improve the bearing capacity and initial stiffness of shear walls,but the ductility and energy dissipation capacity become worse;the increase of steel strength can improve the bearing capacity,ductility and stiffness of shear wall,but the energy dissipation capacity of structure decreases slightly,the increase of steel tube thickness significantly improves the bearing capacity,ductility and stiffness of shear wall,and slightly increases the energy dissipation capacity;the reduction of the ratio of height to width of shear wall can significantly improve the load-bearing capacity and stiffness of the structure.