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1、兰大《结构力学》13春在线作业4（Lanzhoustructuralmechanics,spring13onlinehomework4）14spring13autumnbigorchid"structuralmechanics"13springonlinehomework4Totalscore:100testtime:-RadioexaminationJudgmentquestionRadioexaminationquestions(20questions,60points)1..Thesystemwiththesameinternalforceand
2、displacementdynamiccoefficientiscalculatedwhenthesystem(excludingthedistributionmassofbeam)iscalculatedinFigure117A.homeworkanswerdidnotupload,firstforeveryonetoreviewtheuse,ifyouneedtoanswerthespecificseemyregistrationnametofindB.C.D.Fullmarks:32..Figure44.Reciprocaltheoremofre
3、ciprocalreactionfortwostatesofstructurer12=r21,R12andR21aredimensionsA.forceB.dimensionlessC.force/dimensionD.length/forceFullmarks:33.commonlyusedstructuraltypesofbarsinclude()A.beam,arch,bentandsoonB.beam,arch,rigidframe,etc.C.beam,arch,suspensionstructure,etc.D.beam,rigidfram
4、e,suspensionstructure,etc.Fullmarks:34.figure104structureABrodaxialforceis()excludingaxialdeformation,EI=constantA.B.C.D.Fullmarks:35..Fig.57theinfluencelineofthesupportreactionforceRinthebeamis()A.B.C.D.Fullmarks:36.,figure43,theanswerisnotuploaded,firstforeveryonetoreviewtheus
5、e,andifyouneedtoanswerthespecific,lookatmyregistrationname,tofindthecantileverbeam,thecrosssectionoftheimpactofthebendingmoment,thelineshapeis()A.B.C.D.Fullmarks:37.figure51thebendingmomentofthesectionDintheframeis()A.B.C.D.Fullmarks:3Thetheoreticalbasisofthe8.displacementmethod
6、is()A.forcemethodB.Hooke'slawTheC.determinesthedisplacementanddeterminesthecorrespondencebetweentheinternalforcesD.displacementreciprocaltheoremFullmarks:39.figure56truss,whenthemovingloadPinthelowerchordmoves,axialforcerod54isconstant()A.-PB.0C.P/2D.PFullmarks:310.,figure124,wh
7、ichcannotapplythedynamiccoefficientmethodtocalculatethedynamicdisplacementamplitudeA.B.C.D.Fullmarks:311.,thephysicalmeaningofTis()A.vibrationpersecondB.thenumberofsecondsneededtochangetheforceofaweekThenumberofvibrationsinC.2secsecD.thenumberofsecondsrequiredforaweekofvibration
8、Fullmarks:312.figure83frame,EI=constant,thevert
