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1、西南交《混凝土结构设计原理》在线作业一（SouthwestChina,principlesofconcretestructuredesignonlinehomework）SouthwestChina,"principlesofconcretestructuredesign"onlinehomeworkTotalscore:100testtime:-RadioexaminationAmultiple-choicequestionJudgmentquestionRadioexaminationquestions(4questions,20
2、points)1.,themainreasonfordeflectionofflexuralmembersunderlong-termloadis()CreepandshrinkageofA.concreteB.slipbetweenthesteelbaranditssurroundingconcreteC.crackwidthincreasesNocompressionreinforcementisusedintheD.memberFullmarks:52.,itispossibletoincreasethestirrupratio
3、ofthebeamproperlyA.cansignificantlyincreasethecrackingloadofinclinedcracksB.preventstheoccurrenceofbaroclinicfailureC.significantlyimprovedtheshearcapacityD.transformsthebaroclinicfailureintoshearpressurefailureFullmarks:53.ofthe4groupsofinternalforcessubjectedtoalargee
4、ccentriccompressioncolumnwithsymmetricalreinforcement,themostunfavorablegroupofinternalforcesare()A.,M=251kN*m,N=900kNB.,M=251kN*m,N=300kNC.,M=260kN*m,N=300kND.,M=-251kN*m,N=505kNFullmarks:5Inthe4.part,thefailureofreinforcedreinforcedconcretemembersundertorsionisclassif
5、iedA.ductilefailureB.compressivebrittlefractureC.tensilebrittlefailureD.hasacertainductilityFullmarks:5SouthwestChina,"principlesofconcretestructuredesign"onlinehomeworkTotalscore:100testtime:-RadioexaminationAmultiple-choicequestionJudgmentquestion,(atotalof8multiple-c
6、hoicequestions,atotalof40points.)Isthe1.eccentriccompressionmemberabrittlefailureandwhatarethefollowingfactors?CalculatedlengthofA.componentB.initialoffsetC.materialstrengthD.longitudinalreinforcementFullmarks:52.comparedwiththeinitialloading,theflexuralmembercontinuesw
7、iththedurationoftheexternalloadA.deflectionincreasedB.deflectiondecreasesC.stiffnessB(alsoknownaslong-termstiffnessBL)decreasesD.short-termstiffnessRSdecreasesFullmarks:53.reinforcedconcreteaxialtensionmember,()WhentheA.crackoccurs,thesteelbarissubjectedtotensilestress,
8、i.e.,theyieldstressisreachedThestressincrementofsteelbarsbeforeandaftercrackingofB.isrelatedtothereinforcement
