不同纵筋率对剪跨比为15的有腹筋约束梁受剪性能的影响

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1、英文摘要ABSTRACTIngeneral，toensurethefinalshearfaille，averylarge10ngitudinalreinforcementratio，usuallylargerthan2．8％，waschosenasaprerequisiteinpreviousstudiesonshearbehaviorofreinforcedconcretebeams．Itisverydifferentfromthatinpractice，undersuchcircumstancesthelongitudinalrei

2、nforcementratioisamong1．0～1．5％．Thecodifieddesignequatiousbased0nsuchtestirtgdatamaybeul'tcortservative．SystematicinvestigationforeffectoflongitudinalreinforcementratioonshearbehaviorofRCbeamsisparticularlyrare．Amajorityofpreviousstudiesontheeffectoflongi【tudinalreinforce

3、mentratiotoshearbehaviorofreinforcedconcretememberswerefocusingonultimatecapacity,onlyafewwereengagedindetailedrecordingoftheoveralldevelopmentofcrackingandinvestigationoffinalfailuremodes．Inthispaper,fiverestrainedbeamswithwebanddifferentlongitudinalreinforcementweretes

4、tedunderstaticpointloads，withtheshear-spanratiobeingkeptaround1．5．Onthisbasis，theoverallprocessofcrackingdevelopmentundershearandtheeffectoflongitudinalreinforcementratioonitwasinvestigated．Atfirst，developmentofvariouscrackscarefullyrecordedandstrainsOilboththerebarsandt

5、hestirrupsweremeasuredindetail．togetherwi血thedeftectionsofthebeam．Insuchaway,correlationbetweenthemeasuredstra；nprofilesofthereinforcementandtheobservedcrackingdevelopmentofeachspecimenwaspursued．Principalfactorscontributingtothecrackingpatternandfailuremodewerefiguredou

6、tasaresult．Secondly,comparisonofthetestedresultsunveiledeffectofvariouslongitudinalreinforcementratiosondevelopmentofcracks，finalfailuremode，andultimatecapacity．Primaryconclusionswerethusdrawn．Moreover,themeasuredultimateshearfromthetestswerecomparedwiththatpredictedfrom

7、ChinaDesignCodeofReinforcedConcretestructures，GB50010--2002，andthatfromtheResponse2000，whichisbasedonmodifiedcompressionfieldtheorybyMichaelCollins，bothwereundertakenbeforetheexperiments．Theexperimentsshowed也atthecrackingprocessofsuchrestrainedbeamsinthispaperCanbedivide

8、dintothreephases，thatis，formationofthefanningzones，initializationanddevelopmentofsplittingcracksalonglo