ACI 224.2R-92 Cracking of Concrete Members in Direct Tension

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1、ACI224.2R-92(Reapproved1997)CrackingofConcreteMembersinDirectTensionReportedbyACICommittee224DavidDarwin*AndrewScanlon*GrantT.HalvorsenChairmanPeterGergely*SecretarySubcommitteeCo-ChairmenAlfredG.BisharaFouadH.FouadMilosPolvikaHowardL.BoggsTonyC.LiuL

2、ewisH.Tuthill*MerleE.BranderLeRoyLutz*OrvilleR.WernerRoyW.CarlsonEdwardG.NawyZenonA.ZielinskiWilliamL.Clark,Jr.**Membersofthesubcommitteewhopreparedthisreport.Committeemembersvotingonthisminorrevision:GrantT.HalvorsenRandallW.PostonChairmanSecretaryF

3、lorianBarthPeterGergelyKeithA.PashinaAlfredG.BisharaWillHansenAndrewScanlonHowardL.BoggsM.NadimHassounErnestK.SchraderMerleE.BranderWilliamLeeWimalSuarisDavidDarwinTonyC.LiuLewisH.TuthillFouadH.FouadEdwardG.NawyZenonA.ZielinskiDavidW.FowlerHarryM.Pal

4、mbaumThisreportisconcernedwithcrackinginreinforcedconcretecausedCONTENTSprimarilybydirecttensionratherthanbending.Causesofdirecttensioncrackingarereviewed,andequationsforpredictingcrackspacingandChapter1-Introduction,pg.224.2-2crackwidtharepresented.

5、Ascrackingprogresseswithincreasingload,axialstiffnessdecreases.Methodsforestimatingpost-crackingaxialstiffnessChapter2-Causesofcracking,pg.224.2-2arediscussed.Thereportconcludeswithareviewofmethodsforcontrollingcrackingcausedbydirecttension.2.1-Intro

6、duction2.2-Appliedloads2.3-RestraintKeywords:cracking(fracturing);crackwidthandspacing;loads(forces);reinforcedconcrete;restraints;stiffness;strains;stresse.Chapter3-Crackbehaviorandpredictionequations,pg.tensilestress;tension;volumechange.224.2-33.1

7、-Introduction3.2-TensilestrengthACICommitteeReports,Guides,StandardPractices,andCommentariesareintendedforguidanceindesigning,plan-The1992revisionsbecameeffectiveMar.1,1992.Therevisionsconsistedofning,executing,orinspectingconstructionandinpreparingr

8、emovingyeardesignationsoftherecommendedreferencesofstandards-pro-ducingorganizationssothattheyrefertocurrenteditions.specifications.ReferencetothesedocumentsshallnotbeCopyright01986,AmericanConcreteInstitute.madeintheProjectDocuments.Ifitemsfoundinth