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1、西南交《混凝土结构设计原理》在线作业一（Onlineoperationofdesignprinciplesofconcretestructures）SouthwestChina,"principlesofconcretestructuredesign"onlinehomeworkTotalscore:100testtime:-RadioexaminationAmultiple-choicequestionJudgmentquestionRadioexaminationquestions(4questions,2
2、0points)1.,themainreasonfordeflectionofflexuralmembersunderlong-termloadis()CreepandshrinkageofA.concreteB.slipbetweenthesteelbaranditssurroundingconcreteC.crackwidthincreasesNocompressionreinforcementisusedintheD.memberFullmarks:52.,itispossibletoincreaseth
3、estirrupratioofthebeamproperlyA.cansignificantlyincreasethecrackingloadofinclinedcracksB.preventstheoccurrenceofbaroclinicfailureC.significantlyimprovedtheshearcapacityD.transformsthebaroclinicfailureintoshearpressurefailureFullmarks:53.ofthe4groupsofinterna
4、lforcessubjectedtoalargeeccentriccompressioncolumnwithsymmetricalreinforcement,themostunfavorablegroupofinternalforcesare()A.,M=251kN*m,N=900kNB.,M=251kN*m,N=300kNC.,M=260kN*m,N=300kND.,M=-251kN*m,N=505kNFullmarks:5Inthe4.part,thefailureofreinforcedreinforce
5、dconcretemembersundertorsionisclassifiedA.ductilefailureB.compressivebrittlefractureC.tensilebrittlefailureD.hasacertainductilityFullmarks:5SouthwestChina,"principlesofconcretestructuredesign"onlinehomeworkTotalscore:100testtime:-RadioexaminationAmultiple-ch
6、oicequestionJudgmentquestion,(atotalof8multiple-choicequestions,atotalof40points.)Isthe1.eccentriccompressionmemberabrittlefailureandwhatarethefollowingfactors?CalculatedlengthofA.componentB.initialoffsetC.materialstrengthD.longitudinalreinforcementFullmarks
7、:52.comparedwiththeinitialloading,theflexuralmembercontinueswiththedurationoftheexternalloadA.deflectionincreasedB.deflectiondecreasesC.stiffnessB(alsoknownaslong-termstiffnessBL)decreasesD.short-termstiffnessRSdecreasesFullmarks:53.reinforcedconcreteaxialte
8、nsionmember,()WhentheA.crackoccurs,thesteelbarissubjectedtotensilestress,i.e.,theyieldstressisreachedThestressincrementofsteelbarsbeforeandaftercrackingofB.isrelatedtothereinforcementratioTheten
