高强钢筋高强混凝土一字形截面短肢剪力墙抗震性能试验研究

Experimental study on seismic performance of high strength rebar reinforced high strength concrete short-leg shear wall with rectangular section

对6片配置HRB500高强钢筋高强混凝土一字形截面短肢剪力墙进行低周反复荷载试验,通过改变试件的轴压比、截面高厚比和墙肢端部箍筋间距,研究其破坏模式、承载力,变形能力、延性、滞回性能和耗能能力。试验结果表明:高强钢筋高强混凝土一字形截面短肢剪力墙的破坏模式为弯曲破坏为主的弯剪破坏;墙肢端部密配高强箍筋可以对短肢剪力墙提供有效约束及抑制纵筋屈曲,腹板布置高强水平分布钢筋可以提高短肢剪力墙的抗剪承载力,在高轴压比(设计轴压比=0.5)情况下,一字形截面短肢剪力墙依然具有非常好的延性和耗能能力;随着轴压比和墙肢高厚比的增加,试件承载力明显增加,随剪跨比的减小试件延性明显减小;墙肢端部布置高强纵筋可以显著增强短肢剪力墙承载力,但受到高强材料的脆性影响,短肢剪力墙延性有所减小。

In this paper,six short-leg shear walls with high strength reinforcement and high-strength concrete(in short HSLW)were tested under cyclic lateral loading.The failure mode,bearing capacity,deformation capacity,ductility,hysteretic performance and energy consumption capacity were investigated by changing the axial load ratio,cross-section height-to-width ratio and stirrup spacing.All specimens exhibited flexural-dominant behavior;The high-strength stirrup could effectively restrain HSLW and postpone the buckling of the longitudinal reinforcement;The shear capacity of short leg shear wall can be improved by high-strength horizontal distribution reinforcement.Thus HSLW still had good ductility and energy dissipation capacity under the high axial load ratio(design axial load ratio=0.5).The load-bearing capacity of HSLW increased obviously with the increase of the axial load ratio and the cross-section height-to-width ratio;The ductility of HSLW decreased obviously with the decrease of the shear span ratio;The load-bearing capacity of HSLW was significantly higher than that of ordinary RC short pier shear wall,but the overall ductility turned worse.