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1、Chapter4ShearCapacityofFlexuralMember4.1Introduction4.2Diagonalcracks（斜裂縫）,Shearspanratio（剪跨比）andfailuremodesofinclinedsection（斜截面的破壞形態(tài)）4.3Inclined-sectionshearmechanismofsimplebeam4.4Calculationofshearcapacity4.5Detailingrequirementssatisfyinginclined-sectionalflexu
2、ralcapacity(保證斜截面受彎承載力的構(gòu)造措施)4.6Somedetailingrequirementsforbeamsandslabs5.1IntroductionFFaM圖V圖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（廣義剪跨比）：Calculatedshearspan-to-effectivedepthratio：4.2.3Threemainfailuremodesofinclinedsection?<1（1）Diagonalcompressionfailure：1.Failuremodesofinclinedsectionofbeamwithoutwebreinforcements(無腹筋梁的斜截面破壞形態(tài))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壞形態(tài))AvoiditbystipulatetheminimumamountofshearreinforcementDiagonalcompressionA
