资源描述：
《Chapter F Concrete Nuclear Shelters》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、FConcreteNuclearSheltersF.1IntroductionThissectionisdevotedtotheanalysisanddesignofreinforcedconcretenuclearshelters.CalculationsaregivenforaparticularstudyusingboththeBritishandAmericancodes.DetailsarealsogiveninthissectionregardingtheSwedishCivilDefenceAdmin
2、istrationCode[6.79].F.1.1USCodeUltimateStrengthTheory:GeneralFormulaeFigureF.1showscracking,crushinganddisengagementcasesrecommendedinsuccessiveACIbuildingcodes.GeneralEquation:UltimateStaticMomentCapacityCross-SectionTypeI(1)TheultimateunitresistingmomentMuof
3、arectangularsectionofwidthb,withtensionreinforcementonly,isgivenbyMu=(Asfs/b)(d−a/2),(F.1)whereAs=areaoftensionreinforcementwithinthewidthb,fs=staticdesignstressforreinforcement,d=distancefromtheextremecom-pressionfibretothecentroidoftensionreinforcement,a=dept
4、hofequivalentrectangularblock=Af/0.85bf,b=widthofcompressionsscface,f=staticultimatecompressivestrengthofconcrete.cThereinforcementratiopisdefinedasp=As/bd(F.2)1020FConcreteNuclearShelterstypeIA¢sd¢nocrushingorspallingdTcAsA¢s=Asd¢typeIIcrushingdcTcAstypeIIIA
5、¢s=Asd¢spallingdcTcAscrackingcrushingdisengagementFig.F.1.Reinforcedconcretecross-sections(2)Toensureagainstsuddencompressionfailures,pmustnotexceed0.75oftheratiopb,whichproducesbalancedconditionsatultimatestrengthandisgivenbyp=(0.85Kf/f)[87,000/(87,000+f)],(
6、F.3)b1csswhereK=0.85forfupto4,000psiandisreducedby0.05foreach1c1,000psiinexcessof4,000psi.(3)Forarectangularsectionofwidthbwithcompressionreinforcement,theultimateunitresistingmomentisMu=[(As−As)fs/b](d−a/2)+[(Asfs/b)(d−d)],(F.4)F.1Introduction1021TableF.1
7、.ReinforcementforoneandtwowayelementsPressureReinforcementTwo-wayOne-waydesignrangeelementselementsIntermediateMainAs=0.0025bdAs=0.0025bdandlowOtherAs=0.0018bdAs+As=0.0020bTcHighMainAs=AsAs=As=0.0025bdc=0.0025bdcOtherAs=AsAs=Asaa=0.0018bdc=0.0018bdcaButno
8、tlessthanAs/4usedinthemaindirection(seeFig.F.2forcoefficients)whereA=areaofcompressionreinforcementwithinthewidthb,d=sdistancefromtheextremecompressionfibretothecentroidofcompressio
