简介:Beam-columnorbeam-wallconnectionsareanimportantprobleminhigh-risebuildings.Inthisstudy,basedontheanalysisofanexamplestructure,ananalyticalmodelfordesignofthesemi-rigidconnectionsbetweensteelbeamsandRCwallsinhigh-risehybridbuildingsisproposed.Also,themechanicalcharacteristicsoftheseconnectionssubjectedtolowreversedcyclicloadingareinvestigatedthroughcomparisonofexperimentalresultsfromthreesemi-rigidconnectionsandtworigidconnections.Moreover,somelatentproblemsfordesignoftheseconnectionsaswellasthecorrespondingsolutionsarediscussed.Theresultsfromtheexperimentsandanalysesindicatethatsemi-rigidconnectionsexhibitsatisfactorycapacityandseismicperformance,andtheproposeddesigncanbeusedinpractice.
简介:Theproblemonthedynamicresponseofarigidembeddedfoundationinthepresenceofanundergroundrigidtunnelandsubjectedtoexcitationofincidentanti-planeSHwavesisanalyzed.Byusingtheexactanalyticalsolutionforthetwo-dimensionalSH-wavepropagationinandaroundboththesurfacerigidfoundationandsubsurfacerigidtunnel,thoseaspectsoftheresultinggroundmotionsthatareofspecialinterestandimportanceforseismicresistantdesigninearthquakeanalyseshavebeenexamined.Thecomputedamplitudesoftheresultingperiodicgroundmotionsdisplayaverycomplicatedwave-interferencebetweenthesurfacefoundationandundergroundtunnelthatleadtoobservedstandingwavepatterns,togetherwithabruptchangesinthewaveamplitudesandlargeamplificationoftheincidentmotions.
简介:Forthedynamicsofarigidbodywithafixedpointbasedonthequaternionandthecorrespondinggeneralizedmomenta,adisplacement-basedsymplecticintegrationschemefordifferential-algebraicequationsisproposedandappliedtotheLagrange’sequa-tionsbasedondependentgeneralizedmomenta.Numericalexperimentsshowthatthealgorithmpossessessuchcharactersashighprecisionandpreservingsysteminvariants.Moreimportantly,thegeneralizedmomentabasedLagrange’sequationsshowuniquead-vantagesoverthetraditionalLagrange’sequationsinsymplecticintegrations.
简介:Accordingtothelower-boundtheoremoflimitanalysistheRigidFiniteElementMeth-od(RFEM)isappliedtostructurallimitanalysisandthelinearprogrammingsforlimitanalysisarededucedinthispaper.Moreover,theThermo-ParameterMethod(TPM)andParametricVariationalprinciples(PVP)areusedtoreducethecomputationaleffortwhilemaintainingtheaccuracyofsolutions.Abettersolutionisalsoobtainedinthispaper.
简介:地球作为triaxial被花僵硬身体,它在欧几里得的空格自由地旋转。开始的方程是Euler动态方程,与比比C的B和esmaller小的A。Euler方程被解决,并且数字结果被提供。在计算,下列参数被使用:(C~B)/A=0.00327353;(B-A)/C=0.00002196;(C-A)/e=0.00329549,并且地球的旋转的吝啬的尖速度,co=0.00007292115rad/s。计算证明除地球和它的旋转的免费Euler行列的自我旋转以外,那在那里存在免费点头:在theEarth的片刻的旋转轴和周期性地随着时间变化的吝啬的轴之间的点头角度,或角度。免费点头被调查。
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简介:Inthepresentpaper,afour-stageperforationmodelthataccuratelypredictstheresidualvelocityisdevelopedbyadoptinganenergymethod.Thefourstagesareplugformation,dishingformation,petalformationandprojectileexit.Inaddition,someimportantexperimentalresultsarepresentedandanalyzedtovalidatethepresentperforationmodel.Intheexperiments,highspeedcamerasystemisusedtorecordtheperforationprocess.Observationsontargetdamageandmeasurementsofinitialvelocitiesandresidualvelocitieswiththeaidofthesystemarepresented.Numericalsimulationsarecarriedoutforprojectilesagainstsingleandlayeredplatesadoptedintheexperiments.Theperforationprocessisstudiedandthedeformationandfailuremodesareobtained.Thepredictionsofnumericalsimulationsandanalyticalmodelarefoundinreasonablygoodagreementwiththoseofexperiments,andcanbeusedtopredicttheballisticlimitandresidualvelocityofstiffenedplatesperforatedbyrigidprojectiles.
简介:LetM(2)bethegroupofrigidmotionsoftheplane.TheFouriertransformandthePiancherelformulaonM(2)canbeexplicitlygivenbythegeneralgrouprepresentationtheory.Usingthisfact.weestablishakindofuncertaintyprincipleonM(2).Theresultcaneasilybegeneralizedtohigherdimensionalcases.AnapplicationoftheresultyieldsanuncertaintyprincipleontheEuclideanspacesobtainedbyR.S.Strichartz.
简介:RigidFiniteElementMethod(RFEM)wasproposedtosimulatethemechanicalbehaviorofdiscontinuousstructuressuchasrockandsoilstructures.Theauthors’workonthetheoryandapplicationsofRFEMissummarizedinthispaper.BasedonthetheoryofRFEM,theElasticBody-SeamsModel(EBSM)isproposedtotakethedeformationanddamageofrockmassesintoaccount.
简介:Basedonanincompressiblemodel,byusingthelargestaintheory,thecontactofarubberwedgewitharigidnotchisanalyzedbytheasymptoticmethod.Theproblemistreatedasasymmetriccase,andthecontactsurfaceissmooth.Thestressandstrainfieldneartheapexoftherubberwedgeisshowntobesingular,andtheangulardistributionsofstressandstrainareobtained.Twoimportantparameterstandtareintroducedtoattaintheconclusions.TheresultshowsthatthesingularexponentorderofstressfieldisInr.
简介:Themotionofaspark-inducedcavitationbubbleandanairbubbleneararigidboundaryisexperimentallystudiedbyusinghigh-speedphotography.Severaldimensionlessparametersareusedtodescribethegeometricalconfigurationofthebubble-bubble-boundaryinteraction.Thebubble-bubbleinteractioncanbeconsideredintwodifferentconditions.Thecavitationbubblewillcollapsetowardstheairbubbleiftheairbubbleisrelativelysmall,andawayfromtheairbubbleiftheairbubbleisrelativelylarge.Thetwozonesareidentifiedinthebubble-boundaryinteraction,andtheyarethedangerzoneandthesafetyzone.Therelativeposition,thebubble-boundarydistanceandthebubble-bubbledistanceplayimportantrolesinthebubble-bubble-boundaryinteraction,whichcanbeconsideredinseveralconditionsaccordingtotheresponsesofthebubbles.Airjetsarefoundtopenetrateintothecavitationbubbles.Thecavitationbubbleandtheairbubble(airjet)moveintheirownwaywithoutmixing.Themotionofacavitationbubblemaybeinfluencedbyanairbubbleand/orarigidboundary.Theinfluenceoftheairbubbleandtheinfluenceoftheboundarymaybecombined,likesomethingofavector.
简介:Asimplifiedfatigue-lifemodelisproposedforassessingtheseismicinelasticrotationalcapacityofsteelconnections.Firstrelationsaredevelopedforrigidsteelconnectionsunderlateralloading.Nextthisisextendedtoaccountfortheeffectsoftheweldedsteelmomentframe(WSMF)connectionsoftheso-calledpre-Northridgetype.Theseismicfatiguetheoryisvalidatedagainstexperimentalresults.Theexperimentswereconductedunderincreasingductilityamplitudcsuntiltheonsetoffracture.Miner'rulewasusedtoconvertthetestresultstogivenanequivalentconstantamplitudecyclicfatiguelife.Satisfactoryagreementisobtainedwhencomparingtheexperimentalobservationswiththetheoreticalpredictions.
简介:基于的一个格子和Green-Ampt(Grid-GA)散布了hydrologic物理模型为洪水模拟被开发并且在半潮湿、半干旱的盆预报。基于从数字举起模型(DEM)和Green-Ampt渗入方法提取的每个格子房间的地形学的信息,Grid-GA模型考虑水内容的再分配,并且由植被和根拦截组成,土壤水分蒸发蒸腾损失总量,经由过量渗入机制的流量产生,流量集中,并且流动路由。土壤潮湿的下坡的再分配明确地在一个格子基础上被计算,并且沿着网络被考虑的河排水在流量路由以内在格子之中浇交换。建议模型和Xinanjiang模型在Luohe河里被用于上面的Lushi盆,黄河的一条支流,与为洪水模拟的4716km2的一个区域。结果证明两个模型在洪水模拟表演很好并且能被用于洪水在半潮湿、半干旱的区域预报。
简介:Themainresultsofthispaperarestatedasfollows.LetRbeanorderringinthesemi-primaryringQ.SupposethatRsatisfiesthemaximalconditionfornilrightidealsofR,Thenwehave(i)ifanidealIofRhasafinitelengthasrightR-module,thenIalsohasafinitelengthasleftR-module;(ii)denotebyA(R)theArtinianradicalofR,andNthenilradicalofR,thenA(R)+N/N=A(R/N),ifRsatisfiesthecommutativecondi-tiononthezeroproductofprimeidealsofB.
简介:Asemi-structureddocumenthasmorestructuredinformationcomparedtoanordinarydocument,andtherelationamongsemi-structureddocumentscanbefullyutilized.Inordertotakeadvantageofthestructureandlinkinformationinasemi-structureddocumentforbettermining,astructuredlinkvectormodel(SLVM)ispresentedinthispaper,whereavectorrepresentsadocument,andvectors'elementsaredeterminedbyterms,documentstructureandneighboringdocuments.TextminingbasedonSLVMisdescribedintheprocedureofK-meansforbriefnessandclarity:calculatingdocumentsimilarityandcalculatingclustercenter.TheclusteringbasedonSLVMperformssignificantlybetterthanthatbasedonaconventionalvectorspacemodelintheexperiments,anditsFvalueincreasesfrom0.65-0.73to0.82-0.86.
简介:ThemethodsforprotectingInPsurfaceagainstdegradationduringannealing,includingencapsulantandencpsulant-freetechniques;rapidthermalan-nealingofInPimplantedlayers;implantedionspeciesandsomeprofilesoftypicaldopants,etc.,theyareallthekeytechniquesconcerningionimplantationintose-mi-insulatingInP,andhavebeenreviewedsyntheticallyaswell.
简介:Hamiltonianstructureofarigidbodyinacircularorbitisestablishedinthispaper.Withthereductiontechnique,theHamiltonianstructureofarigidbodyinacircularorbitisderivedfromLie-Poissonstructureofsemidirectproduct,andHamiltonianisderivedfromJacobi’sintegral.TheabovemethodcanbegeneralizedtoestablishtheHamiltonianstructureofarigidbodywithaflexibleattachmentinacircularor-bit.Atlast,anexampleofstabilityanalysisisgiven.