Research On Anti-seismic And Anti-collapse Performance Of New Type Joint Damper

After entering the new century,steel structure construction continues to increase globally,which is mainly due to its advantages,such as high strength and light weight.However,under the action of earthquakes,there are endless events of such structural damage,so it is extremely important to study the seismic and collapse resistance of them.In the previous earthquakes,the steel structure damage was often caused by the damage of the joints.Therefore,in the analysis of the earthquake resistance and collapse resistance of the structure,the mechanical properties of the joints should be studied first,and then the earthquake resistance and collapse resistance analysis of the overall structure.In view of the fact that traditional beam-column steel joints often break before members,this paper proposes a reinforced friction soft steel dual energy dissipation joint,based on the ABAQUS finite element software to study its mechanical properties,and the energy dissipation joint is applied to the steel frame,On this basis,to study its seismic and collapse resistance.The main work completed is:(1)Based on the ABAQUS software,the multi-scale and solid modeling method is used to carry out the numerical simulation of the joint.The results show that the multi-scale model can simulate the stress of steel beam column joints quickly and accurately.(2)According to the traditional steel beam column joint,a new type of reinforced beam column steel joint with additional energy dissipation elements is proposed.By changing the pre tightening force of the damper and the thickness of the circular opening of soft steel,the mechanical performance indexes such as hysteretic curve and energy dissipation capacity are analyzed.The results show that the hysteretic performance and energy dissipation capacity of the joint with damper are significantly enhanced.(3)The reinforced energy dissipation joint is applied to the plane steel frame structure,and the nonlinear dynamic time history analysis of the frame structure under different working conditions is carried out,and the vertex displacement and inter story displacement angle of the steel frame structure under various joint forms are analyzed.The results show that the peak displacement and storey displacement angle of the steel frame structure with damper are smaller than those of the frame without damper,which effectively improves the seismic performance of the structure.(4)The static pushdown analysis and nonlinear dynamic time history analysis of the steel frame structures with different reinforced nodes are carried out by the method of dismantling components.The ultimate bearing capacity,structural rigidity and deformation of the steel frame under different working conditions are studied.Vertical displacement analysis.The results show that within a reasonable range,the larger the thickness of the damper mild steel opening,the stronger the carrying capacity and the smaller the deformation,thereby improving the continuous collapse resistance of the steel frame.