Finite Element Analysis Of Seismic Behavior Of Steel Frame Structure Filled With Rubber Brick

As a new type of filling wall material,rubber brick has low cost,can effectively relieve environmental pressure and save energy,and has good performance of insulation,sound insulation,noise reduction and so on.As a new industrial system,steel structure residence has the characteristics of light weight and high strength,short construction period and high structural stability.As the most common lateral support in multilayer steel structure,the infilled wall can effectively increase the lateral stiffness of the structure and optimize the interior layout.However,the infilled walls are mostly made of brittle materials,the shear strength is low,the deformation ability is poor,the failure is earlier,and the addition of the infilled walls increases the weight of the structure,which has a negative effect on the steel frame.The rubber brick has small density,light weight and good damping property,which can make the infilled wall to be subjected to less earthquake and improve the seismic performance of the whole structure effectively.Therefore,it is of theoretical and practical significance to study the effect of rubber brick infilled wall on the seismic behavior of steel frame.First of all,the modal analysis of SF,RSF,LSF,R1SF and R2SF,and the nonlinear dynamic time history analysis under the action of two actual seismic waves and one artificial seismic wave are carried out by using the large finite element analysis software ABAQUS,the effects of infilled wall materials and the layout of infilled walls on the natural vibration frequency of the structure,the maximum horizontal displacement of the top floor and the shear force at the bottom of the column are compared and analyzed.Secondly,the nonlinear analysis of SF and RSF structure under monotone and low cycle reciprocating loads is carried out by using ABAQUS,and the monotone load-displacement curve,hysteretic curve and stiffness degradation curve of the structure are compared and analyzed.The effect of rubber brick filled wall on the bearing capacity and lateral stiffness of the whole structure was determined.Finally,the variable parameter finite element analysis of RSF is carried out.The effects of filling wall material,opening ratio,ratio of height to span,axial compression ratio on hysteretic characteristics,bearing capacity,stiffness and energy dissipation capacity of the whole structure are compared.The structure of the study indicates that:the natural vibration frequency of the whole structure is reduced by adding the rubber brick infilled wall,and the increasing speed of the natural vibration frequency of the whole structure is slowed down.Under the action of seismic wave,the effect of rubber brick infill wall on improving the lateral stiffness of steel frame is more significant than that of lime-sand brick infill wall,and the increase of column bottom shear force is smaller,and the negative effect on the seismic behavior of the whole structure is less;the effect of infilled wall on the lateral stiffness of the whole structure is poor in the steel frame structure with non-filled wall.Under monotonic and low-cycle reciprocating loads,rubber brick filled walls can effectively improve the bearing capacity and lateral stiffness of the whole structure,improve the stress concentration of frame columns,but weaken the energy dissipation capacity of the whole structure.The greater the axial compression ratio,the smaller the ultimate bearing capacity,the worse the ductility,the earlier the failure,the greater the initial stiffness,the greater the degradation rate of Secant stiffness,the greater the stress at the beam,column and joint of the frame,and the greater the diagonal stress in the diagonal direction of the filled wall.The load-bearing capacity and ductility of the structure can be reduced when the ratio of height to span is too high.When the ratio of height to span is small,the load-bearing capacity of the structure will be improved appropriately,and the initial stiffness of the whole structure will be improved obviously,but the stiffness degradation speed will be faster.It is unfavorable to the ductility of the structure and the high span ratio is too large or too small which is not conducive to the energy consumption of the structure.The opening of doors and windows weakens the bearing capacity,ductility and stiffness of the whole structure,but enhances the energy dissipation ability of the structure.The larger the opening rate,the smaller the bearing capacity and stiffness of the whole structure,but the better the ductility,the more obvious the stress concentration phenomenon of the structure is.