CAJ | 학술논문

基于9根小跨高比(l/h≤2.5)钢纤维高强混凝土连粱和4根高强混凝土对比连粱试验,考察了跨高比、钢纤维体积掺率和配箍率对高强混凝土连粱位移廷性和耗能能力的影响.结果表明:随着跨高比、铜纤维体积掺率和配箍率的增大,连梁的位移延性和耗能性能得到明显改善.当配箍率提高到一定程度后,由于剪压区混凝土破碎引起剪切滑移坡坏,箍筋不能完全发挥作用,配箍率对连梁的延性和耗能能力的影响不再明显.而在按非抗震要求配置箍筋的高强混凝土连粱中掺入ρ_f=1.0%的钢纤维,可使连粱达到与按抗震要求配置箍筋的连粱相当的位移延性系数,而当ρ_f=1.5%时,试件发生了弯曲破坏,从根本上改变了小跨高比高强混凝土连梁破坏的脆性性质.
기우9근소과고비(l/h≤2.5)강섬유고강혼응토련량화4근고강혼응토대비련량시험,고찰료과고비、강섬유체적참솔화배고솔대고강혼응토련량위이정성화모능능력적영향.결과표명:수착과고비、동섬유체적참솔화배고솔적증대,련량적위이연성화모능성능득도명현개선.당배고솔제고도일정정도후,유우전압구혼응토파쇄인기전절활이파배,고근불능완전발휘작용,배고솔대련량적연성화모능능력적영향불재명현.이재안비항진요구배치고근적고강혼응토련량중참입ρ_f=1.0%적강섬유,가사련량체도여안항진요구배치고근적련량상당적위이연성계수,이당ρ_f=1.5%시,시건발생료만곡파배,종근본상개변료소과고비고강혼응토련량파배적취성성질.
On the basis of the experiment of 9 steel fiber reinforced high-strength concrete coupling beams of small span/depth (l/h≤ 2. 5) and 4 control coupling beams, the effects of span/depth, steel fiber volume fraction and stirrup content on ductility and energy dissipation capacity of high-strength concrete coupling beams were investigated. The test results show that increasing span/depth, steel fiber volume fraction and stirrup content can improve the ductility and the energy dissipation capacity of coupling beams evidently. When the stirrup content goes beyond a certain value, a shear slippage failure occurs due to the crumbling and spalling of concrete in compressive-shear region of coupling beams, and the effect of stirrup content on coupling beam is not obvious. Whereas, adding ρ_f= 1. 0% steel fibers to a nonseismic coupling beam can achieve an equivalent displacement ductility ratio to that of seismic designed one. And a further increase of ρ_f to 1. 5% can change the failure type of a coupling beam from a brittle shear failure to a ductile flexural failure essentially.