Research On Seismic Behavior And Control Method Of Plate-fiber Reinforced Concrete Coupling Beams And Coupled Shear Walls

The coupled shear wall is a widely used lateral resisting structure.The reasonably designed coupled shear wall can achieve the yield mechanism of coupling beams first yielding and the bottom of the wall yielding.In order for the coupled shear wall to achieve this optimal yielding mechanism under earthquakes,in addition to requiring the coupling beam to have good bearing capacity and deformation capacity,a reasonable design of the shear wall is also required.Therefore,based on the study of plate-fiber reinforced concrete coupling beams,this paper further studies the seismic performance control method of the composite coupled shear wall.The main research contents and results are as follows:(1)A pseudo-static test of a plate-fiber reinforced concrete coupling beam and a plate-concrete coupling beam was completed,and the failure process,failure mode,hysteretic behavior and strain of each part of the two specimens were compared and analyzed.The analysis results show that the plate-fiber reinforced concrete coupling beam has higher bearing capacity,ductility and energy dissipation ability,and has good damage resistance before the main crack occurs,which can meet the bearing capacity and deformation requirements under strong earthquakes.(2)Based on the finite element software to verify the test model,the stress of each part of specimen and the internal force distribution of the embedded steel plate of coupling beam were extracted.The effects of span-to-depth ratio,steel plate ratio,concrete compressive strength,longitudinal reinforcement ratio and stirrups reinforcement ratio on the seismic performance of plate-fiber reinforced concrete coupling beams were further analyzed.The analysis results show that span-to-depth ratio,concrete compressive strength and steel plate ratio are the main factors affecting the seismic performance of steel-fiber reinforced concrete coupled shear wall,the stress distribution of concrete,reinforcement and steel frame was extracted.Meanwhile,the plastic hinges developing law of this composite coupled shear wall is also studied.The numerical simulation of the composite coupled shear wall model is further performed,and the parameters such as the axial compression ratio,the cross-section size of the coupling beam,the aspect ratio of the single-sided wall limb,the total floor height,and the coupling ratio are analyzed.It is suggested that the reasonable coupling ratio for steel-fiber reinforced concrete coupling beam composite coupled shear wall in high seismic fortification intensity areas is from 45%to 60%,and the axial compression ratio should not exceed 0.3.(4)Based on the reasonable axial compression ratio and coupling ratio,the seismic behavior control method for steel-fiber reinforced concrete coupling beam composite coupled shear wall is proposed based on the continuous connection method.