Experimental Research On Seismic Behavior Of RC Shear Wall With HRB600 High-strength Rebars

With the rapid development of human science and technology construction.the number of high-rise buildings is getting increased,and reinforced concrete shear wall which is an important component to resist lateral force,plays a very important role in high-rise buildings,its seismic performance has a direct impact on the overall structure of the seismic design.High strength reinforcement can reduce steel consumption and improve component strength and shrink the component sizes,High strength reinforcement has been widely used in Japan and Europe and other developed countries,but we still lack experimental data of concrete shear wall with HRB600 high strength steel in domestic.It is not clear about the applicability in the shear wall.Therefore,eight concrete shear wall specimens with different reinforcement forms are designed in this paper to study the seismic behavior of the concrete shear wall.In the low cyclic loading experiments of 8 reinforced concrete shear wall specimens,HRB600 high strength steel are respectively arranged as the boundary column longitudinal reinforcement,distributing rib of wall plate and boundary column stirrup.Besides,different Height-width-ratio are considered to study the failure characteristics of specimens,steel strain,hysteretic characteristics,bearing capacity,displacement and ductility,rigidity degradation and the seismic performance of energy dissipation.The results show that compared with the ordinary concrete shear wall,the bearing capacity of end column shear wall strength substitution high-strength longitudinal reinforcement and high-strength reinforced wallboard distribution,deformation capacity and energy dissipation capacity the strength of stirrup end column bearing capacity have been improved,,but the displacement and ductility increase is not very apparent,end column stirrup spacing has little influence on the increase of bearing capacity,but it will reduce the energy dissipation capacity of the specimens;The ratio of height is one of the important factors,with the decrease of the height width ratio,the bearing capacity of shear wall has been increased,but the deformation capacity,ductility and energy dissipation capacity are significantly decreased,and the damage form by bending failure gradually transition to the bendingshear failure.On the basis of experimental research,we use finite element software ABAQUS analysis models which are established and the simulation of the 4 specimens,the test results and the simulation results are compared,both are in good conformed,that model can be used to analyze the seismic performance.The effect of axial compression ratio is not considered in the experiment,but the influence of the axial compression ratio is further studied by using the software.The results show that when axial compression ratio is between 0.2~0.6,with the increase of axial compression ratio,the bearing capacity of shear wall is increas firstly and then decreas,little difference is small displacement and ductility under axial compression,with the increase of axial compression,ratio decreased,in order to ensure that the seismic behavior of the shear wall,axial compression ratio should be limited in design stage.