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1、建筮結(jié)掏堂撮』Q旦塑壘!Q!旦迥魚i籃璺!坐!!旦!塑委i;差盤翌簍:差墨!_墨文章編號:1000—6869(2017)06—0123—10DOI:10.14006/j.jzjgxb.2017.06.014輕骨料混凝土無腹筋梁受剪性能試驗研究易偉建,丁雅博,陳暉(湖南大學(xué)土木工程學(xué)院,湖南長沙410082)摘要:為研究骨料種類對無腹筋梁受剪性能的影響,以剪跨比和縱筋配筋率為變量,進(jìn)行了16根集中荷載作用下的無腹筋混凝土簡支梁受剪性能試驗,其中8根采用普通碎石混凝土,8根梁采用頁巖陶粒(輕骨料)混凝土,對輕骨料和普通混
2、凝土梁的裂縫發(fā)展、破壞形態(tài)、斜向開裂荷載、受剪承載力、跨中撓度、裂縫面相對位移等進(jìn)行了觀察和測量。對比分析表明:輕骨料混凝土梁的斜向開裂荷載和受剪承載力均低于普通混凝土梁,其裂縫面較普通混凝土的更加光滑;將輕骨料混凝土梁受剪承載力試驗值與采用我國JGJ12—2006《輕骨料混凝土結(jié)構(gòu)技術(shù)規(guī)程》和美國規(guī)范ACI318—11、加拿大規(guī)范CSA23.3—04、歐洲規(guī)范EC2方法的計算值進(jìn)行對比分析,結(jié)合此次試驗結(jié)果和從國內(nèi)外文獻(xiàn)中搜集的126組已有試驗數(shù)據(jù),對我國JGJ12—2006的受剪承載力公式的準(zhǔn)確性和安全性進(jìn)行探討
3、,提出了無腹筋輕骨料混凝土梁受剪承載力計算的建議公式。關(guān)鍵詞:無腹筋混凝土梁;輕骨料}昆凝土;靜力試驗;受剪承載力;折減系數(shù)中圖分類號:TU375.1TU528.1TU317.1文獻(xiàn)標(biāo)志碼:AExperimentalstudyonshearbehavioroflightweightaggregateconcretebeamswithoutstirrupsYIWeijian,DINGYabo,CHENHui(CollegeofCivilEngineering,HunanUniversity,Changsha410082
4、,China)Abstract:Inordertoinvestigatetheinfluenceofaggregatetypesonshearbehaviorofreinforcedconcrete(RC)beamswithoutstirrups,16simplysupposedbeams,whichconsistof8beamswithnormalconcreteand8beamswithlightweightconcrete,weretestedtoshearfailureunderpointload.Other
5、mainvariablesinthetestwereshearspan·to—depthratioandlongitudinalreinforcementratio.Thedevelopmentofcracks,failurepattern,diagonalcrackingload,uhimateshearstrength,beamdeflectioninthemiddlespan,aswellasrelativedisplacementsatcracksurfaceofthespecimenswereobserve
6、dandmeasured.Bycomparingandanalyzingthetestresults,itisshownthatthediagonalcrackingloadandultimateshearstrengthoflightweightaggregatebeamsaresmallerthanthoseofnormalbeams,andtheshearfailurecracksurfacesoflightweightaggregatebeamsaremuchsmoother.Thetestedshearst
7、rengthoflightweightaggregatebeamswascomparedwiththepredictionsofJGJ12—2006,ACI318-11,CSA23.2-04andEC2.Bycombiningthetestresuhsinthisstudyand126beamscollectedfromliteratures.theshearstrengthequationofJGJ12—2006wasevaluated.Finally.a(chǎn)newequationforshearstrengthofr
8、einforcedlightweightconcretebeamswithoutstirrupswasproposed.Keywords:concretebeamwithoutstirrups;lightweightaggregateconcrete;statictest;shearstrength;reductionfactor基金項目:國家