| The multi-ribbed buckling-restrained steel plate shear wall(MBR-SPSW)is a new type of lateral force resisting system which is improved on the basis of the traditional unstiffened thin steel plate shear wall(US-SPSW).The plate surface is divided into multiple regions to restrain its overall buckling by setting grid multi-ribs on both sides of the infill plate.This method can effectively reduce not only the out-of-plane deformation and sound generated by the infill plate during its working,but also the adverse effects on the surrounding frame from the tension band.Besides,the hysteretic behavior of the structure is also improved in this way.So far,the research on this structural system has been focused on the quasi-static aspect.From dynamic angle,the seismic behavior of the MBR-SPSW is systematically studied by means of experimental research and numerical analysis in this paper.The main research content and conclusions are as follows:(1)The shaking table test of a 1:3 reduced-scale four-layer MBR-SPSW was carried out.The results showed that the structure can basically be in elastic state under frequent earthquakes.Under this circumstance,the infill plate resisted the lateral load by shear deformation.Under rare earthquakes,the rigidity of the structure decreased acceleratedly.Under this circumstance,the infill plate resisted the lateral load by the tension band.The maximum inter-story drift angle under frequent earthquakes and rare earthquakes was respectively 1/476 and 1/68,which both met the corresponding demands of the seismic design code of buildings.After the action of rare earthquakes,the structural rigidity was 86.3% of the initial state,which means the structural system possesses high safety reserve.(2)After removing the grid multi-ribs of the original specimen,the shaking table test of the residual specimen was carried out.The results showed that under rare earthquakes,the breathing effect of the infill plate was quite obvious.The maximum inter-story drift angle under this circumstance was 1/43,which exceeded the corresponding demand of elastic-plastic limitation in the seismic design code of buildings.After the action of rare earthquakes,the structural rigidity was 66.45% of the state just when the grid multi-ribs were removed.(3)On the basis of the experimental results,the numerical simulation of the MGB-SPSW was carried out by ABAQUS 6.12.It was found that the numerical results agreed well with the experimental results,which means the finite element model can effectively simulate the response of the structure under dynamic loads.By means of the validated model,the influence caused by the thickness and the yield strength of the infill plate on the dynamic performance of the structure was systematically studied.The results indicate that increasing thickness of the infill plate is conductive to maintaining the uniform stiffness distribution of the structure.Meanwhile,this can also effectively reduce the inter-story deformation of the weak layer and the out-of-plane deformation of the infill plate.With the increment of thickness and yield strength,MGB-SPSW will produce greater acceleration response.Meanwhile,under this circumstance,the buckling mode of the infill plate tends to be the mode of overall buckling.In that case,the stiffness of the grid multi-ribs should be enhanced.(4)By means of numerical simulation,the influence caused by the grid multi-ribs on the dynamic performance of the thin steel plate shear wall was analyzed.The results indicate that setting grid multi-ribs plate is conductive to maintaining the uniform stiffness distribution of the structure under the action of rare earthquakes.Meanwhile,this could also effectively reduce the out-of-plane deformation of the infill plate by 57.01 percent to the maximum extent.Besides,under two-stage seismic condition,setting grid multi-ribs plate can effectively delay the degeneration of the rigidity corresponding to the weak layer in the thin steel plate shear wall. |
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