Study On The Performance And Design Method Of Shear-type Arc-shaped Corrugated Steel Plate Dampers

The shear panel damper(SPD)is a widely used shear-type metallic hysteretic energy dissipation device,which has higher bearing capacity and stiffness compared to flexural metal dampers,thus exhibiting superior energy dissipation performance.To investigate the influence of flanges and stiffeners on the energy dissipation performance and buckling modes of SPDs,three different configurations of SPD were designed: flangeless non-stiffened,flanged non-stiffened,and flanged horizontally stiffened.Mechanical and low-cycle fatigue performance tests were conducted,along with finite element analyses on these three dampers and an additional flangeless horizontally stiffened variant.The findings indicate that flanges contribute additional energy dissipation,preventing corner failures of the web plate and enhancing the energy dissipation efficiency of the web plate,but exacerbate buckling in the middle of the web plate.Stiffeners offer limited performance enhancement for dampers without flanges.With flanges,stiffeners significantly delay the onset and progression of web buckling.However,due to the influence of residual stresses resulting from stiffener welding,the dampers may be prone to brittle fracture.To address the issue of out-of-plane buckling susceptibility of the web plate in SPDs,an innovative shear-type arc corrugated steel plate damper(ACSPD)is proposed.This damper adopts vertically arc corrugated web plate to enhance its resistance to out-of-plane buckling,without the need for stiffeners,effectively avoiding the issue of residual welding stresses.Six different configurations of flangeless ACSPDs with varying corrugation parameters and one flanged ACSPD were designed to study the performance differences.Mechanical performance tests,low-cycle fatigue performance tests,and finite element analyses were conducted.The results show that flangeless dampers are prone to early failure at the corners of the web plate,and both corrugation amplitude and the number of corrugations have a significant influence on damper performance.The flanged damper effectively prevents early failure at the corners of the web plate,thus fully exploiting the performance advantages of corrugated web plate.Experimental and finite element comparative studies were conducted to validate the performance improvement of ACSPDs over traditional SPD.The results demonstrate that ACSPDs not only inherit the excellent mechanical performance and efficient energy dissipation capacity of SPD but also effectively delay the occurrence of out-of-plane buckling of the web plates,thereby exhibiting superior overall performance in the post-buckling stage.Additionally,finite element analyses were employed to study flangeless and flanged ACSPDs under different design parameters,elucidating the specific effects of corrugation number,corrugation amplitude,web plate aspect ratio,web plate thickness,and energy dissipating component materials on damper performance,and providing parameter value recommendations to achieve optimal damper performance.Currently,research on SPDs is mainly based on the premise of unidirectional loading within the plane.To study the performance variation of dampers under bidirectional loading and the effects of flanges and stiffeners on the performance of dampers under bidirectional loading,different configurations of SPDs and ACSPDs were designed.Mechanical performance tests,low-cycle fatigue performance tests,and finite element analyses were conducted under 0° direction(simulating unidirectional loading within the plane)and 45°direction(simulating bidirectional loading within and out of the plane).The study reveals that under 45° direction loading,the energy dissipation mechanism and failure modes of the dampers significantly change,leading to a noticeable decrease in energy dissipation capacity.Compared to SPDs,ACSPDs exhibit better ductility and energy dissipation performance.Flanged dampers are susceptible to failure at the corners of their flanges,which significantly reduces the load-bearing capacity of SPDs,but has relatively minor effects on ACSPDs.Additionally,flanges play a crucial role in enhancing the energy dissipation efficiency of the web plate in ACSPDs.For SPDs,the inclusion of stiffeners does not enhance their performance under loading in this direction.Finite element analyses were conducted using monotonic loading across 19 different loading angles and two loading modes(force loading and displacement loading)for both SPDs and ACSPDs.Moreover,cyclic loading finite element analyses were carried out on 7different loading angles,maintaining identical in-plane loading conditions.The analysis results show that the performance variation of dampers under bidirectional loading is not directly related to the loading mode but mainly depends on the angle of the resultant force.With an increase in the resultant force angle,the energy dissipation efficiency of both dampers gradually decreases,and their performance in the in-plane direction is significantly affected,resulting in decreased yield force,bearing capacity,and energy dissipation capacity,and earlier failure.It is recommended to consider the influence of out-of-plane loading on the in-plane performance of dampers in energy dissipation and seismic design.The initial stiffness calculation formulas for SPDs and ACSPDs in the in-plane and out-of-plane directions were derived.Additionally,a method for calculating the yielding parameters of shear-type steel plate dampers under bidirectional force in any resultant direction was provided based on yield criteria.For energy dissipation structures equipped with shear-type steel plate dampers,a design method that accounts for the impact of bidirectional seismic loading effects was proposed.The settings of mechanical model parameters for dampers in structural analysis and the detailed checks of key components in the energy dissipation substructures were discussed.