受弯构件斜截面承载力计算(III)

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1、Chapter4ShearCapacityofFlexuralMember4.1Introduction4.2Diagonalcracks（斜裂缝）,Shearspanratio（剪跨比）andfailuremodesofinclinedsection（斜截面的破坏形态）4.3Inclined-sectionshearmechanismofsimplebeam4.4Calculationofshearcapacity4.5Detailingrequirementssatisfyinginclined-sectionalflexu

2、ralcapacity(保证斜截面受弯承载力的构造措施)4.6Somedetailingrequirementsforbeamsandslabs5.1IntroductionFFaM图V图WebreinforcementsStirrupsBent-upbars4.2Diagonalcrack,shearspanratioandfailuremodesofinclinedsection4.2.1Web-shearcracksandflexural-shearcracks4.2.2Shearspanratio4.2.3Threefa

3、iluremodesofinclinedsection1.Stressanalysisofflexuralmember12345234123454.2.1Flexural-shearcracksandweb-shearcracksPrincipaltensilestressPrinciplestresstrajectoryFlexural-shearcracksWeb-shearcracks2、Typesofcracks4.2.2Shearspanratio(shearspan-to-effectivedepthrati

4、o)FFaMVGeneralizedshearspanratio（广义剪跨比）：Calculatedshearspan-to-effectivedepthratio：4.2.3Threemainfailuremodesofinclinedsection<1（1）Diagonalcompressionfailure：1.Failuremodesofinclinedsectionofbeamwithoutwebreinforcements(无腹筋梁的斜截面破坏形态)Shearforceishighandbendingmomenti

5、ssmallWed-shearcrackscutthebeamintodiagonalshortcolumnsTheprincipalcompressivestressexceedsthecompressivestrength.1≤≤3（2）Shearcompressionfailure：Severaldiagonalcracksformbetweentheconcentratedloadandsupport.Oneofthemdevelopsintocriticaldiagonalcracks.Concreteinshear

6、-compressionzonecrushesonthetopofthecriticaldiagonalcracks.（3）Diagonaltensionfailure：>3Thediagonaloccursanddevelopsintocriticalcrack.Thecriticaldiagonalcracksplitbeamintotwo.Theshearcapacityforthethreefailuremodes：Diagonalcompression>shearcompression>diagonaltension

7、，TheyareallbrittlefailureDiagonalcompressionShearcompressionDiagonaltensionTheamountofwebreinforcementisappropriate>3andtheamountofreinforcementisinadequateTheamountofwebreinforcementistoomuchShearcompressionDiagonaltensionAvoiditbyshearcapacitydesign2.Failuremodeso

8、finclinedsectionofbeamwithwebreinforcements(有腹筋梁的斜截面破坏形态)AvoiditbystipulatetheminimumamountofshearreinforcementDiagonalcompressionA