FRP加固钢筋混凝土受弯构件裂缝性能的研究的中期报告Abstract:Thispaperpresentsthemid-termreportofastudyonthecrackperformanceofreinforcedconcrete(RC)beamsstrengthenedwithfiber-reinforcedpolymer(FRP)compositesunderbendingload.TheobjectivesofthestudyaretoinvestigatethecrackbehaviorofRCbeamsbeforeandafterstrengtheningwithdifferentFRPmaterials,andtoevaluatetheeffectivenessofFRPreinforcementinenhancingthecrackperformanceofRCbeams.TheexperimentalprograminvolvestestingofsixRCbeams,threeofwhichareusedascontrolspecimenswhiletheotherthreearestrengthenedwithdifferenttypesofFRPsheets.Thebeamsaresubjectedtofour-pointbendingloaduptofailure,andthecrackpropagationbehaviorismonitoredusingstraingaugeandacousticemissiontechniques.TheresultsofthestudywillhelptoimprovethedesignandapplicationofFRPstrengtheningtechniquesforRCstructures.Introduction:Reinforcedconcrete(RC)structuresarewidelyusedinvariouscivilengineeringapplicationsduetotheirhighstrength,durability,andlowmaintenancerequirements.However,RCstructuresaresusceptibletocrackingandcorrosion,whichcanleadtosignificantreductionintheirload-carryingcapacityandservicelife.Inrecentyears,fiber-reinforcedpolymer(FRP)compositeshaveemergedasaneffectiveretrofittingmaterialforstrengtheningandrepairofexistingRCstructures.FRPcompositeshavehighstrength-to-weightratio,corrosionresistance,andeaseofapplication,makingthemapopularchoiceforstrengtheningRCstructures.OneofthemainadvantagesofFRPcompositesistheirabilitytoenhancethecrackperformanceofRCstructuresunderbendingload.CracksinRCstructurescanleadtoreducedstiffness,increaseddeflection,andreducedload-carryingcapacity.FRPreinforcementcanhelptopreventcrackpropagationandenhancetheflexuralperformanceofRCstructures.However,theeffectivenessofFRPreinforcementinenhancingthecrackperformanceofRCstructuresdependsonvariousfactors,includingthetype,amount,andorientationoftheFRPreinforcement,aswellasthetypeandseverityofthecrack.Objectives:ThemainobjectivesofthisstudyaretoinvestigatethecrackbehaviorofRCbeamsbeforeandafterstrengtheningwi