钢纤维对钢筋自密实混凝土梁抗剪性能的影响  

Influence of steel fiber on shear performance of reinforced self-compacting beams

作　　者：刘岳鑫[1] 丁一宁[1] 刘思国[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《混凝土》2009年第10期83-87,共5页Concrete

基　　金：国家自然科学基金资助项目(50578026)

摘　　要：对9根钢纤维钢筋自密实混凝土梁进行了试验研究,主要的变化参数是纤维掺量和配箍率。基于试验结果,分析了钢纤维对钢筋自密实混凝土梁的极限承载能力、抗剪强度、破坏形态及抗剪韧性的影响。试验结果表明:加入钢纤维可以显著提高梁的极限承载力和韧性,改善梁的破坏形态;提出了与普通钢筋混凝土梁相协调的钢纤维钢筋自密实混凝土梁的极限承载力的经验公式,并建议端部弯钩型钢纤维的增强系数取值为1.78。Tests were carried out on 9 steel fiber-rebar reinforced self-compacting concrete beams with various fiber contents and stirrup ratios. Based on the test results,the influence of steel fiber on ultimate strength, shear strength, failure mode and shear toughness of rebar reinforced self-compacting concrete beams were analyzed.The experimental results show that steel fiber can obviously enhance the ultimate strength and shear toughness of the beam, and improve the failure mode.Empirical formula to predict the shear strength of steel fiber-rebar reinforced self-compacting concrete beams was suggested, which was coordinated with reinforced beanls.The fiber enhancement factor of hooked steel fiber was suggested as 1.78.

关 键 词：钢纤维 纤维增强系数 极限荷载 破坏形态 荷载-挠度曲线 

分 类 号：TU528.572[建筑科学—建筑技术科学]