Study On The Mechanism Of Energy Dissipation And Design Method Of Self-Centering Steel Spherical Bearing

Based on a type of universal anti-vibration and elastic bearing with low yield steel plates setting in the spring plates,it was placed in the steel spherical bearings as damping energy dissipation components in the paper.This type of new spherical steel bearing was simple in structure and had a clear mechanism of shock absorption and energy dissipation.And it not only met the requirements of the energy dissipation in the event of large earthquakes,but also met the requirements of stiffness and reposition under both small earthquake and wind action.Furthermore,it was also easy to be replaced in time after damage.In this paper,the new type of ball bearing seismic energy dissipation components was further improved in experimental research,finite element numerical calculation and theoretical analysis.The main research contents were as follows:(1)Design of seismic energy dissipation components of the new type spherical steel support:the mechanism of the shock absorption,energy dissipation and reposition of the new type of spherical steel support was confirmed according to the possible relative motions of the superstructure and the substructure in earthquake.It is intended to analyze the details of the design of the bearing through theoretical research and finite element numerical analysis in order to make it conform to the design requirements in a specific space.(2)20 groups models of seismic energy dissipation components were established by using ANSYS,and the effect of their structural forms,mild steel thick,plate spring thick,plate spring(mild steel)width and arc height on dissipation capacity and mechanical property of the component were studied.The research showed that mild steel plates of the bearings were uniformly forced,and easily yielded into the hysteretic deformation energy dissipation stage.While the plate springs were still in the elastic force stage,providing the reduction stiffness.(3)7 other group models of seismic energy dissipation components were established by using ANSYS,and the effect of the yield strength ratio between mild steel and the plate spring on dissipation capacity and mechanical property was studied.The research showed that the yield strength ratio had a great effect on both the dissipation capacity and the mechanical property of the bearing seismic energy dissipation component.The match component of the mild steel material Q235 and plate spring 60Si2Mn was preliminarily determinated to be excellent.(4)Via the finite element analysis results of 27 sets of seismic energy dissipation components of the bearings,the calculation formulas for the mechanical properties analysis theoretically of the seismic energy dissipation components of the bearings werepreliminarily determined.After that,the formulas were modified and verified with two other sets of components.Finally,design methed of the seismic energy dissipation components of the bearings was put forward.(5)The low-cycle reciprocating loading experiment was carried out to observe their hysteretic performance by preparing test specimens.The experimental results showed the mechanical property of the seismic energy dissipation components of the new type spherical bearing was stable,which was with good self-reset function,and the purpose of energy dissipation can also be achieved.Besides,and the safety factor of the dissipation energy components were high.