冲击载荷作用下舰艇管路系统全局参数灵敏度分析(4)

　　Abstract:　Inordertoanalyzemainfactorsinfluencingdisplacementresponseofashipboardpipingsystemandto

provideadvicesonimprovingitssafetyundershockloads,atwo2dimensionpipingsystemmodelundershockloadsissetupandtheSobolπmethodisusedtoanalyzeglobalsensitivitiesofthefollowingparameters:elasticmodulus,density,

期刊论文

Vol.26No.32007　　　　　　　　　　　　　　　JOURNALOFVIBRATIONANDSHOCK157

thickness,andinnerradiusofthepipematerial,stiffnessesandlocationsofsupports,andtheexertingintervalsofshockloads.Influencesofasingleparameterandcombinationsofseveralparametersonthedisplacementresponseofthepipingsystemareobtainedandthekeyparameterswithstronginfluencesareobtained.

Keywords:dynamicshockresponse,pipingsystem,globalsensitivity,dynamicFEM,Sobolπmethod

STUDYONASEISMICPERFORMANCEOFAMULTI2RIBBED

COMPOSITEWALLUNDERPSEUDO2DYNAMICTEST

HUANGWei,　CHENGuo2xin

1,2

2,3

,　YAOQian2feng

2

(11DepartmentofCivilEngineering,XiπanJiaotongUniversity,Xiπan　710049,China;

21SchoolofCivilEngineering,XiπanUniversityofArchitecture&Technology,Xiπan　710055,China;31SchoolofWaterConservancyandCivilEngineering,XinjiangAgriculturalUniversity,Urumchi　830052,China)

　　Abstract:　Amulti2ribbedcompositewallisthemainmembertobearforcesinMRSS(multi2ribbedslabstruc2

ture),whoseaseismicperformanceanddynamicalcharacteristicsarethekeypointsneededbycomputationaltheoryofMRSS.Basedonthetestofamulti2ribbedcompositewallunderpseudo2dynamicforce,itsmainfailuremodesanditsmainfailureprocessesarestudied;itsdynamicresponse,hystereticcurvesandoutliningcurvesareanalyzed;itsrestoringforcemodeisputforward;atlast,itsdamagelevelunderearthquakewithdifferentacceleratipeakvaluesisevaluated.Accordingtothetheoreticalanalysisandthetestresults,itcanbethattheribbedgridsandouterframesofthewallaredevotedtoresistlateralloadinturnatpandfailurestage,whichmakesittopossessseveralaseismicdefendinglines;therbearingcapacityandbetterenergydissipationabilityaftersmallearthquakeorwallisprovidedwithbetteranti2collapseperformanceafterbigearthquake;a2forcemodelforthemulti2ribcompositewallispres2ented;itsfailureparameterstodamagelevelunderearthquake.

Keywords:multiwall,pseudo2dynamicforce,restoringforcemodel,damageevaluation

ANANALYSISOFMOVEMENTSTRESSWAVEOF

ADIRECTIVEBLASTINGOFACHIMNEY

XIEFei2hong

1,2

,　WANGXu2guang,　YUYa2lun,　LUOGuan2wei

314

(11SchoolofCivilandEnvironmentalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;

21SchoolofCivilEngineering,LanzhouJiaotongUniversity,Gansu,Lanzhou　730070,China;

31BeijingGeneralResearchInstituteofMiningandMetallurgy,Beijing,100044,China;

41CollegeofMechanical2ElectronicsEngineering,LanzhouJiaotongUniversity,Lanzhou　730070,China)

　　Abstract:　Inprocessofachimneydirectiveblastingcontrol,sometimes,aphenomenonthatthechimneybreaksoff

alongitscrosssectionappears.Inordertoclarifythereasonwhyitoccurs,equationofmotionofmovementwaveisusedtofinditsmotionlawundervariousdetonationconditions,aswellasstressbehaviorsandtheiractingpositionsproducedbyblastsatdifferentinstants.Thetimeinstantatwhichthemaximumstretchingstressmayappearanditspositionarefound,anditsdistributionfittingcurveisdrawn.A100mhighconcretestructurechimney,anda80mhighbrickworkstructurechimneyastwoexamplesareanalyzedbyusingnumericalsimulationforcomparison.Itisconcludedthatthedet2onationnetwithleversegmentsandshorttimedelayissuitablefordetonationofachimneydirectiveblasting.

Keywords:blastingengineering,chimneyblastingcontrol,numericalsimulation,stresswave

MONTECARLOSIMULATIONFORFIRSTFAILURETIME

OFSTRUCTURESEXCITEDBYNON2GAUSSIANLOAD

HEJun

(SchoolofNavalArchitecture,Ocean&CivilEngineering,ShanghaiJiaotongUniversity,Shanghai　200240,China)

　　Abstract:　BasedonthefirsttofourthmomentsofstructuralrandomresponsesandWintersteintransformation,

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