Finite Element Analysis For Seismic Performance Of Superimposed Coupled Shear Wall

The coupled shear wall is widely used in high-rise seismic building structure,Coupling beam with appropriate strength,stiffness and good deformation can improve the seismic performance of the coupled shear wall structure.The superimposed coupled shear wall studied in this paper is a new type of shear wall structure system introduced from Germany,which consists of two external prefabricated wall layer and a sandwich cast-in-place concrete layer of superposition.Because of its low cost,fast construction speed,green environmental protection and other significant advantages to conform to the development direction of the construction industry.As a new type of shear wall structure system,its theory and experimental research less.Especially under the action of seismic load,the research on the seismic performance of the superimposed coupled shear wall is far from enough.In order to study the seismic performance of the superimposed coupled shear wall.Establish a reasonable mechanical model of superimposed coupled shear wall on the basis of the existing experimental study of composite shear wall,follow the architectural design in the practical engineering requirements for extraordinary openings size standard,and the existing superimposed shear wall section bearing capacity calculation method.ABAQUS finite element software is used to set up the relevant parameters reasonably,and the accurate 3D model is established,which can accord with the material constitutive relation,boundary condition,stress performance and so on.Compare the performance of bearing capacity,ductility and failure mode under the horizontal reciprocating loading test of superimposed shear wall with friction?superimposed shear wall bound by common node and the same size of the cast-in-place shear wall.Through the analysis of the finite element simulation results,verify its seismic performance and damage characteristics.The comparison of the simulated failure mode and the actual test shows that the composite surface in the superimposed coupled shear wall has bond-slip exists under the action of earthquake load.Cast part of wall is prior to the destruction of the precast part.The ultimate bearing capacity of superimposed shear wall,which is defined by the friction and the common node binding,is higher than the cast-in-place wall.Since the prefabricated lattice gird in the beam of superimposed coupled shear wall that enhance the wall's stiffness,while reducing the cost of construction site.The superimposed coupled shear wallstructure has a good seismic performance under the action of seismic load.For the further research on the related factors that affect the seismic performance of superimposed shear wall.This paper focuses on the analysis of the three factors which affect the seismic performance of the superimposed coupled shear wall,such as the axial compression ratio,the span ratio of the coupling beam,and the form of the lattice reinforcement in the coupling beam.Compared with the specimen model from the elastic state gradually into the plastic state and reach the limit state of the damage morphology and bearing capacity.So as to better understand the anti-seismic mechanism of the superimposed shear wall structure which can not be observed in the test and the damage mechanism inside the wall.To ensure that the superimposed shear wall structure can be widely applied to the actual project,and for the structural system design research to provide relevant theoretical reference.The results show that the elastic and elastic-plastic properties of the superimposed shear wall are significantly affected by the axial compression ratio.The greater the axial compression ratio in a certain range,the greater the bearing capacity and the lower ductility.The appropriate axial compression ratio has a certain effect on the seismic performance of the superimposed shear wall structure.,Span ratio of coupling beam in the superimposed shear wall hich mainly affects the seismic performance of wallboard members after cracking.With the increase of span depth ratio,the bearing capacity decreases and the lateral stiffness decreases.