鋼筋混凝土斷裂參數(shù)的試驗研究

1、大連理工大學(xué)碩士學(xué)位論文鋼筋混凝土斷裂參數(shù)的試驗研究姓名：何連立申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：吳智敏20050601鋼筋混凝土斷裂參數(shù)的實驗研究AbstractAsoneheterogeneouscompositethefracturemechanismofconcreteisverycomplicatedanddifficulttostudybecauseofthephysicalcharacteristicscombin

2、ationaspectsandstateofstressofthecomponentofthecomponentofconcrete.Butconcreteisinthemassiveusewitharchitecturalprojectwhichneedstheresearchersmusttostrengthentheresearchoftheconcretewiththedevelopmentofnationaleconomyit

3、isdecidedtostudythecharacteristicsoftheconcrete.Inordertostudytheinfluencesofconcretespecimensizesandreinforcementrequirementondoublekfractureparameterthefracturetestwascarriedoninthispaperrespectivelyusingnotchedthreepo

4、intbendbeamswiththedifferentsize(800X150X200mm)anddifferentinitialratioofthenotchdepthtothebeamdepth(0.20.30.40.5).ThisparametercanbeusedtodeterminetheconcretematerialconstantItalsoshowsthatfractureenergyincreaseswiththe

5、increaseofspecimenheightandtendstobeaconstam.Withthepresentmodelyieldingorslippageofreinforcementcanprecedeorfollowcrackpropagationinconcreteremovingtheassumptionofsteelyieldingatincipientfracture.Suchatheoreticalapproac

6、happearstobeveryusefulforestimatingtheminimumamountofreinforcementformembersinflexureassumingsimultaneousconcretecrackingandsteelyielding(transitionalcondition).Aphysicallysimilarflexuralbehaviorisobtainedincaseswherethe

7、brittlenessnumberisthesame.Thefailuremechanismchangescompletelywhenthebeamdepthisvariedthesteelpercentageremainingthesame.Onlywhenthesteelpercentageisinverselyproportionaltothesquarerootofthebeamdepthisthemechanicalbehav