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1、DOI:10.14006/j.jzjgxb.2009.04.011第30卷第4期2009年8月建筑结构学报JournalofBuildingStructuresVol.30No.4Aug.2009012文章编号:1000-6869(2009)04-0094-08高强箍筋高强混凝土梁受剪试验研究12易伟建,吕艳梅(1.湖南大学土木工程学院,湖南长沙410082;2.广东省建筑设计研究院,广东广州510010)摘要:设计了一套使钢筋混凝土梁剪切破坏稳定可控的刚性试验系统,利用该试验系统,完成了19根剪跨比为3的钢筋混凝土简支梁的剪切破坏试验,得到了荷载-
2、挠度曲线。根据试验结果,分析了混凝土强度等级、箍筋的强度和倾角、纵筋配筋率和纵向分布钢筋等因素对试验梁破坏形态、剪切延性系数和受剪承载力的影响,并将受剪承载力试验值与我国混凝土结构设计规范和美国ACI规范计算值进行了对比。结果表明:对于剪跨比等于3的梁,适当配置腹筋,可以改善其延性性能;在高强混凝土梁中应用高强箍筋,可使两种材料的强度充分发挥,不仅增加了梁的剪切延性,而且提高了梁的受剪承载力;高强箍筋高强混凝土梁的受剪承载力仍可采用我国现行混凝土结构设计规范公式进行计算,但是对于高强混凝土无腹筋梁、纵筋配筋率低的梁和配有高强箍筋的普通强度混凝土梁安全
3、度偏低。关键词:混凝土梁;高强混凝土;高强箍筋;静力试验;受剪承载力;剪切延性中图分类号:TU375.1TU317.1文献标识码:AExperimentalstudyonshearbehaviorofhigh-strengthconcretebeamswithhigh-strengthstirrups12YIWeijian,LYanmei(1.CollegeofCivilEngineering,HunanUniversity,Changsha410082,China;2.TheArchitecturalDesignandResearchInstitu
4、teofGuangdongProvince,Guangzhou510010,China)Abstract:Astifftestfacilitywasdevelopedforobtainingstableandcontrolledshearcriticalofreinforcedconcretebeams.Atotalof19reinforcedconcretebeamswithshearspan-to-depthequalto3weretestedinthetestingfacility,andcompleteload-midspandeflecti
5、oncurveswereobtained.Basedonthedataoftestedbeams,first,theeffectsofconcretestrength,stirrupsstrength,inclinedstirrupangle,theamountoflongitudinalreinforcementonmodeloffailure,shearductilitycoefficientandshearcapacitywereanalyzed.Then,theshearstrengthoftestbeamswerecomparedwitht
6、hesheardesignapproachesofChinacodefordesignofconcretestructuresandAmericaACIcode.Theresultsindicatethatwhenshearspan-to-depthequalto3,shearfailureinthebeamswithappropriatewebreinforcementshaveadefiniteductility.Inaddition,high-strengthconcretebeam,reinforcedwithhighstrengthstir
7、rups,canincreasegreatlynotonlytheshearductility,butalsotheshearcapacity.Besides,theshearcapacityofbeamswithhigh-strengthconcreteandstirrupcanbestilldesignedbycurrentChinacode,butthesheardesignapproachinthecodeisunsafeforhigh-strengthconcretebeamswithoutwebreinforcements,beamswi
8、ththesmalleramountoflongitudinalreinforcementandthenor
