受弯构件正截面承载力计算2

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1、第四章受弯构件5.1概述Chapter5FlexuralStrengthofRCMembers受弯构件正截面承载力计算第五章受弯构件5.1概述Questions1WhytherearedifferenttypesofRCmembers?2Whataboutthefunctionsofreinforcementdetailing?3Howtosimplifythecalculationofflexurestrength?4HowtodeterminethemaximumandminimumreinforcementratioforRCbeams?5HowtodesignRCbeam

2、whenthemaximumorminimumreinforcementratioarenotsatisfied?6HowtodesignT-sectionRCbeam?第五章受弯构件5.1概述5.1概述Introduction◆BeamsandslabsareallBendingMembers.◆Generally,typesofbeamsectionincluderectangular,T-section,I-section,boxsection,Γ-sectionandΠsection.◆Sectionofcast-in-siteone-wayslabisrectangul

3、ar,whosedepthhisslabthicknessandwidthisunitwidth（b=1000mm）.5.1概述第五章受弯构件◆PrecastslabincludehollowslabandΠsectionslab.◆Consideringofrequirementoftheconstructionandtheentiretyofthestructure,itissometimesselectedtocombinetheprecastmethodwiththecast-in-sitemethodintheapplication,andthisiscalledcom

4、binedbeamsorslabs.5.1概述第五章受弯构件◆结构中常用的梁、板是典型的受弯构件(BendingMember)◆梁的截面形式常见的有矩形、T形、工形、箱形、Γ形、Π形◆现浇单向板为矩形截面，高度h取板厚，宽度b取单位宽度（b=1000mm）◆预制板(PrecastSlab)常见的有空心板、槽型板等◆考虑到施工方便和结构整体性要求，工程中也有采用预制和现浇结合的方法，形成叠合梁和叠合板5.1概述第五章受弯构件第五章受弯构件5.1概述d=10~32mm(usually)h0=h-as单排a=35mm双排a=55~60mmConstructionalDetailsofB

5、eams：1ToensurethedurabilityandfireresistanceofRCstructures,andthebondperformancebetweentherebarandconcrete,thethicknessoftheconcretecovershouldnotlessthan25mm;2Toensurethetheconsolidationofthecasting,theclearspacingbetweentherebarsatthebottomofthebeamshouldnotlessthan25mmorthediameterdofthere

6、bar.Andfortherebarsatthetop,itshouldnolessthan30mmor1.5timesoftherebardiameterd;SingleRowDoubleRows第五章受弯构件5.1概述d=10~32mm(usually)h0=h-as单排a=35mm双排a=55~60mmConstructionalDetailsofBeams：3Generally,thenumberofthelongitudinalrodatthebeambottomisnotlessthan2,andtheordinarydiameteris10~32mm。Whenthe

7、rearemanyrods,theycanbeplacedindifferentrows;SingleRowDoubleRows第五章受弯构件5.1概述d=10~32mm(常用)h0=h-as单排a=35mm双排a=55~60mm梁的构造要求：1为保证RC结构的耐久性、防火性以及钢筋与混凝土的粘结性能(BondBehavior)，钢筋的混凝土保护层(Cover)厚度一般不小于25mm；2为保证混凝土浇注的密实性(Consolidation)，梁底部钢筋的净距(ClearSpaci