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ID:27640399
大小:1.55 MB
页数:110页
时间:2018-12-01
《受弯构件正截面承载力计算2》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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