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,