Study On Influence Of Shape Optimization Of Steel Damper On Seismic Performance Of IRR Column

In order to realize the rapid recovery of the structure after the earthquake,the research group proposed a new type of innovative resilient rocking column(IRR column)technology.It consists of rocking steel column,replaceable steel damper,T-shaped connecting plate and high-strength bolts.Based on the previous research,this paper studies the influence of the shape of the steel damper on the seismic performance of the IRR column.The main work was as follows:(1)Cyclic loading tests were performed on 12 sets of full-scale IRR column specimens.The main parameters include the shape,material type and planar layout of the steel damper.All the specimens exhibited excellent hysteretic energy dissipation capabilities,with high load carrying capacity,initial stiffness and ductility.(2)The damper perpendicular to the loading direction provides 10.2% to 15.1%of the carrying capacity of the IRR column.The remaining carrying capacity is mainly contributed by the IRR column of the damper parallel to the loading direction.(3)The shape of the damper has a significant effect on the carrying capacity.The overall mechanical performance of the IRR column using the non-opening steel damper is significantly better than that of the specimens using the steel slit damper.The maximum carrying capacity is increased by 81.5%,and the cumulative energy consumption value at the same displacement angle is increased by 40.7%.(4)The type of steel damper also has a significant impact on the overall seismic performance of the IRR column.The use of Q235 steel or 304 stainless steel has no significant effect on the carrying capacity of the specimens and the energy consumption capacity before the 1/35 displacement angle,but the deformation capacity of the test piece using the stainless steel damper is increased by 25%.(5)The ABAQUS software was used to establish a refined finite element model,and the deformation characteristics,hysteresis curves,and skeleton curves were compared with the test specimens in order to verify the model's rationality.At the same time,the refined finite element model was used for systematic parameter analysis.(6)The effects of the axial compression ratio and the number of struts of dampers were studied by a finite element model.The results show that with the increase of the axial compression ratio,the ultimate carrying capacity and deformation self-recovery capacity of the specimens are improved.The ultimate loading and energy dissipation capacity of IRR columns decrease with the number of struts in the damper.(7)Based on the plastic limit analysis method,the ultimate carrying capacity of the IRR column of the slotted type damper is calculated,and an equivalent simplified calculation method for the carrying capacity of the IRR column of the slotted type damper is proposed.The calculated results are in good agreement with the experimental and finite element analysis results.