单轴压缩下含T形裂隙混凝土力学特性试验研究.docx

单轴压缩下含T形裂隙混凝土力学特性试验研究
Abstract
Inthisexperimentalstudy,themechanicalcharacteristicsoftheconcretecontainingT-shapedcracksunderuniaxialcompressionareinvestigated.ThestudyaimstounderstandthebehaviorofT-shapedcracksinconcreteandtoguidethedesignandconstructionofconcretestructures.ThespecimensusedintheexperimentwerepreparedwithT-shapedcrackdefectsatthecenter,andtheuniaxialcompressivestrength,thestrain-stressrelationship,andthestressdistributioncharacteristicswereanalyzed.TheresultsshowedthatthepresenceofT-shapedcrackshasasignificantimpactonthemechanicalbehaviorofconcrete.Thecrackwidth,cross-sectionalshape,anddirectionofcrackpropagationallaffectthestressdistributionandfailuremechanismofthespecimens.ThestudyprovidesguidanceforthedesignandconstructionofconcretestructuresthatmayencounterT-shapedcracks.
Keywords:Concrete,T-shapedcrack,Uniaxialcompression,Stressdistribution,Failuremechanism
Introduction
Crackingisacommonprobleminconcretestructuresthataffectstheirdurabilityandfunctionality.Amongthevarioustypesofcracks,T-shapedcracksareaparticularconcernbecauseoftheiruniqueshapeandthepotentialriskofrapidpropagation.T-shapedcracksoftenoccurinthecornersofreinforcedconcretestructures,suchasbeams,columns,andwalls,duetothehighstressconcentrationcausedbythetransferofloadsandthedifferentialshrinkageofconcreteandsteel.T-shapedcracksnotonlyreducetheloadcarryingcapacityandstiffnessofstructuresbutalsoacceleratethedeteriorationofconcreteandthecorrosionofreinforcement.Therefore,itisimportanttounderstandthemechanicalbehaviorofT-shapedcracksinconcreteandtodevelopeffectivemeasurestomitigatetheiradverseeffects.
ThemechanicalcharacteristicsofconcretecontainingT-shapedcracksunderuniaxialcompressionhavebeenstudiedbyseveralresearchers.Chenetal.(2018)investigatedtheeffectsofT-shapedcracksontheuniaxialcompressivestrengthandthestressdistributionofreinforcedconcretecolumns.Zhangetal.(2019)exploredthefailuremechanismandenergyabsorptioncapacityofconcretespecimenswithsingleandmultipleT-shapedcracks.Liuetal.