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1、13春学期《钢结构(一)》在线作业2NortheasternUniversity,14spring,13autumnEast,13springsemester,"steelstructure(1)〃onlinehomework2Totalscore:100testtime:一RadioexaminationRadioexaminationquestions(20questions,100points)About1.oftheboltandrivetconnection,thefollowingstatementiswrong.A.thenumbe
2、rofpermanentboltsshouldnotbelessthantwoateachendofthejointandatoneendofthesplicejointB.inthehighstrengthboltconnectionarea,thecomponentcontactsurfacetreatmentmethodshouldbeexplainedintheconstructiondrawingC.thepullconnectionofordinaryboltsthataredirectlysubjectedtodynamicload
3、sshallbedoublenutsorothereffectivemeasurestopreventlooseningofthenutD.commonboltscanbeusedforshearconnectionsdirectlysubjectedtodynamicloadsFullmarks:52.fixedbeamunderconcentratedload,thecompressivestresscannotmeettherequirements,theisamorereasonablemeasure.A.thickeningflange
4、B.supportstiffenerissetatconcentratedloadC.increasesthenumberoftransversestiffenersD.thickenedWebFullmarks:5ThreeA.AB.BC.CD.DFullmarks:5FourBecauseofbendingnormalstress,A.needslongitudinalstiffenerBecauseofbendingnormalstress,B.needstransversestiffenerBecauseoftheshearstressi
5、nducedbucklingofC.,longitudinalstiffenersshouldbeusedBecauseoftheshearstressinducedbucklingofD・，transversestiffenerisrequiredFullmarks:55.steelcoldhardening,the•A.strengthincreased,plasticityandtoughnessdecreasedThestrength,plasticityandtoughnessofB.increaseThestrength,plasti
6、cityandtoughnessofC.decreaseD.reducesplasticityandincreasesstrengthandtoughnessFullmarks:56.battentypeaxialcompressioncolumnwithlacingbarsaccordingtoaxispressurebardesign,butthestrengthofsteelshouldbemultipliedbythereductionfactortoconsiderEffectofA.shearforceTheinflueneeofwe
7、ldingdefectsonB>rodsTheinfluenceofeccentricityononesideconnectionofC.TheD.nodeconstructsthemisalignment,effectFullmarks:5SevenA.AB.BC.CD.DFullmarks:58.topreventthebeamweblocalbuckling,oftentakestiffeningmeasures,thisisto・A.increasesthemomentofinertiaofthebeamcrosssectionB・inc
8、reasescross-sectionalareaC.changesthestressdistributionofthecomponen
