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1、DOI:10.14006/j.jzjgxb.2009.04.011第30卷第4期2009年8月建筑結(jié)構(gòu)學(xué)報(bào)JournalofBuildingStructuresVol.30No.4Aug.2009012文章編號(hào):1000-6869(2009)04-0094-08高強(qiáng)箍筋高強(qiáng)混凝土梁受剪試驗(yàn)研究12易偉建,呂艷梅(1.湖南大學(xué)土木工程學(xué)院,湖南長(zhǎng)沙410082;2.廣東省建筑設(shè)計(jì)研究院,廣東廣州510010)摘要:設(shè)計(jì)了一套使鋼筋混凝土梁剪切破壞穩(wěn)定可控的剛性試驗(yàn)系統(tǒng),利用該試驗(yàn)系統(tǒng),完成了19根剪跨比為3的鋼筋混凝土簡(jiǎn)支梁的剪切破壞試驗(yàn),得到了荷載-
2、撓度曲線。根據(jù)試驗(yàn)結(jié)果,分析了混凝土強(qiáng)度等級(jí)、箍筋的強(qiáng)度和傾角、縱筋配筋率和縱向分布鋼筋等因素對(duì)試驗(yàn)梁破壞形態(tài)、剪切延性系數(shù)和受剪承載力的影響,并將受剪承載力試驗(yàn)值與我國(guó)混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范和美國(guó)ACI規(guī)范計(jì)算值進(jìn)行了對(duì)比。結(jié)果表明:對(duì)于剪跨比等于3的梁,適當(dāng)配置腹筋,可以改善其延性性能;在高強(qiáng)混凝土梁中應(yīng)用高強(qiáng)箍筋,可使兩種材料的強(qiáng)度充分發(fā)揮,不僅增加了梁的剪切延性,而且提高了梁的受剪承載力;高強(qiáng)箍筋高強(qiáng)混凝土梁的受剪承載力仍可采用我國(guó)現(xiàn)行混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范公式進(jìn)行計(jì)算,但是對(duì)于高強(qiáng)混凝土無(wú)腹筋梁、縱筋配筋率低的梁和配有高強(qiáng)箍筋的普通強(qiáng)度混凝土梁安全
3、度偏低。關(guān)鍵詞:混凝土梁;高強(qiáng)混凝土;高強(qiáng)箍筋;靜力試驗(yàn);受剪承載力;剪切延性中圖分類號(hào):TU375.1TU317.1文獻(xiàn)標(biāo)識(shí)碼: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
