Analysis Of Fire Resistance Of Steel Frame Embedded Steel Plate Shear Walls

Steel plate shear walls are widely used in high-rise buildings due to their large initial stiffness,large deformation capacity,stable hysteresis and good plasticity.However,the fire resistance of steel products is poor.With the increase of temperature,the mechanical properties of steel will change significantly,which will affect the safety of structure.At present,there are few studies on the fire resistance of steel plate shear walls.In this paper,the existing research results at home and abroad are summarized,and application of ABAQUS finite element software to build steel frame embedded steel plate shear wall structure(the following abbreviated steel plate shear wall structure),the model is loaded by ISO-834 standard heating curve,the resistance to fire is studied.This paper mainly studies the following aspects:(1)In order to prove the feasibility of using ABAQUS finite element software to simulate the fire resistance of steel plate shear wall,this paper uses ABAQUS to establish and simulate the same experimental model as the known literature.The simulation results are compared with the experimental results,and there is a certain error but the trend is in good agreement.It shows that it is feasible to simulation analysis the fire resistance of steel plate shear walls by using ABAQUS finite element software.(2)In order to select reasonable parameters,models of different height thickness ratio,axial compression ratio and span height ratio are established.The deformation performance(beam deflection,axial displacement of column,lateral displacement of column,plate displacement of steel plate)and force performance(steel plate stress)under fire are studied.The results show that the thicker the steel plate is,the smaller the deflection of the beam is,the later the ultimate deformation time is.Change of axial compression ratio has a great influence on the axial displacement of the column.With the increase of the axial compression ratio,the axial displacement of the column gets larger and larger at room temperature.The axial displacement of the column becomes smaller and smaller when the fire ends.The span height ratio has a great influence on the deformation and stress of the component.The greater the limit deflection of the beam with span is greater,it is not easy to destroy early.The greater the lateral displacement of the column and the stress peak of the steel plate(3)Building single story single span steel frame embedded steel plate shear wall structure,the effect of fire on the overall fire resistance of the structure in different positions is studied.The deflection curve of the beam,the lateral displacement curve of the column,the displacement curve of the steel plate shear wall and the stress cloud chart are obtained undereach working condition.The results show that the deformation of steel frame is related to the area of fire and the position of fire,the larger the fire area is,the closer the ignition point is to the steel frame,the greater the deformation of the beam and column.The direction of the external displacement of the surface of the fire is accidental.The stress distribution around the fire face at the end of the fire,especially in the steel frame,the stress of the beams and columns should be greater.It is necessary to strengthen the fire protection of beams and columns to avoid stress concentration and accelerate the destruction of components.(4)A three story three span steel frame embedded steel plate shear wall structure is established.The temperature field distribution,structural deformation and internal force variation under different fire conditions are studied.According to the limit state of steel structure under fire,it is further concluded whether the structure or component reaches the ultimate bearing state.The results show that the maximum deflection of the top floor beam and the maximum out of plane displacement of the steel plate,and the beam is easy to reach the deformation limit prematurely.It is unfavorable to the structure as a whole.It is necessary to strengthen the fire protection of the top layer,especially the middle span position of the top layer.The column deformation is related to the position of fire and the constraint conditions,and the influence of the side span on the deformation of the column is the greatest,although it does not reach the limit of deformationt,but in the fire resistant design column as the key component,the column fire protection protection should be strengthened.The top floor side span steel plate displacement maximum.The beam column node stress maximum at the end of the fire,the fire increase adjacent stress in different working conditions,the fire protection design should strengthen the joint protection and consider the adjacent stress.