简介：

简介：Inordertoresolvethetrafficcongestionproblem,manycable-stayedbridgesaredesignedwithalargewidthtospanratio.Thisresultsinsignificantshearlageffecttocausenonuniformstressdistributionalongtheflangesofthebeamofbridge.ThispaperreportsstudyontheshearlageffectoftheLanzhouXiaoxihuYellowRiverBridge.A3Dfiniteelementmodelofthebridgewasdevelopedandfiniteelementanalysis(FEA)wasdonetoobtainthetheoreticalresults.Toevaluatethetheoreticalresults,ascaledmodelwasmadetoconductstatictestinlaboratory.TheexperimentresultsaccordedwiththeresultsobtainedbyFEA.ItisprovedthatFEAisaneffectivemethodtopredictshearlageffectofbridgesofthistype.

简介：Staycables,theprimaryloadcarryingcomponentsofcable-stayedbridges(CSBs),arecharacterisedbyhighflexi-bilitywhichincreaseswiththespanofthebridge.Thismakesstaycablesvulnerabletolocalvibrationswhichmayhavesignificanteffectsonthedynamicresponsesoflong-spanCSBs.Hence,itisessentialtoaccountfortheseeffectsintheassessmentofthedynamicsCSBs.Inthispaper,thedynamicresponsesofCSBsundervehicularloadsarestudiedusingthefiniteelementmethod(FEM),whilethelocalvibrationofstaycablesisanalyzedusingthesubstructuremethod.Acasestudyofacable-stayedsteelbridgewithacenterspanof448mdemonstratesthatstaycablesundergolargedisplacementsintheprimarymodeofthewholebridgealthough,ingeneral,acable’slocalvibrationsarenotobvious.Theroadsurfaceroughnesshassignificanteffectsontheinteractionforcebetweenthedeckandvehiclebutlittleeffectontheglobalresponseofthebridge.Loadimpactfactorsofthemaingirderandtoweraresmall,andtheimpactfactorsofthetensionofcablesarelargerthanthoseofthedisplacementsofgirdersandtowers.

简介：桥为工作的及时估价的缘故调节，测量桥结构的动态特征很重要、必要。监视测试的GPSdynamic在武汉Baishazhou桥被执行，它是最长的跨度之一留下来电缆线的桥在中国被造了。这篇论文介绍试验性的实现计划和数据处理方法。中间的跨度的颤动特征留下来ofcable的桥牌被使用有效地获得光谱分析途径。测量结果与理论设计价值很相同。研究表明那，高采样率的withGPS接收装置和合适的数据处理方法，桥结构的颤动特征能与高精确性被决定。

简介：使用一个多级式的摆钟团的可能性更潮湿(MSPMD)部分地理论上被学习在建设期间控制一座留下来电缆线的桥的一个单个列塔的导致风的颤动我这个工作。在这篇论文，为减少桥塔颤动的MSPMD的表演试验性地被学习。一个MSPMD模型和有几何学可伸缩1:100的桥的一个塔模型被设计并且生产。有不同电线长度的MSPMD模型的刻度被进行验证分析模型更潮湿。为不受管束的独立的塔，有电报的塔，和与MSPMD模型一起的塔的一系列测试然后在泛音和白噪音刺激下面被执行。试验性的结果证明塔模型的回答显著地与MSPMD模型的安装减少，它表明MSPMD的有效性减轻桥塔的颤动。

简介：A3D为Sutong留下来电缆线的桥(SCB)的有限元素(FE)模型基于ANSYS被建立。桥的动态特征用一个subspace重复方法被分析。基于记录的风数据，测量系列表达式用非线性的最少平方的回归方法被介绍。在桥地点的狂暴的风被模仿基于光谱表示方法和快速傅里叶变换技术。桥的动态特征上的一些关键结构的参数和措施的影响被调查。这些参数包括死了的负担紧张，以及钢盒子girder的垂直、侧面、扭力的僵硬。另外，在钢盒子girder的颤动模式上在塔和girder之间采用的连接设备的有弹性的僵硬的影响被调查。分析证明垂直、侧面、扭力的buffeting排水量，回答作为死者逐渐地减少的所有装载紧张增加。动态特征和SCB的结构的buffeting排水量反应被钢盒子girder的垂直、扭力的僵硬仅仅稍微影响，并且当侧面的僵硬增加，侧面、扭力的buffeting排水量回答逐渐地减少。这些结果为动态分析提供一本参考书并且super-long-span设计留下来电缆线的桥。

简介：AsimplifiedfragilityanalysisoffantypecablestayedbridgesusingProbabilisticRiskAnalysis(PRA)procedureispresentedfordeterminingtheirfailureprobabilityunderrandomgroundmotion.Seismicinputtothebridgesupportisconsideredtobeariskconsistentresponsespectrumwhichisobtainedfromaseparateanalysis.Fortheresponseanalysis,thebridgedeckismodeledasabeamsupportedonspringsatdifferentpoints.Thestiffnessesofthespringsaredeterminedbyaseparate2Dstaticanalysisofcable-tower-decksystem.Theanalysisprovidesacoupledstiffnessmatrixforthespringsystem.Acontinuummethodofanalysisusingdynamicstiffnessisusedtodeterminethedynamicpropertiesofthebridges.Theresponseofthebridgedeckisobtainedbytheresponsespectrummethodofanalysisasappliedtomultidegreeoffreedomsystemwhichdulytakesintoaccountthequasi-staticcomponentofbridgedeckvibration.Thefragilityanalysisincludesuncertaintiesarisingduetothevariationingroundmotion,materialproperty,modeling,methodofanalysis,ductilityfactoranddamageconcentrationeffect.ProbabilityoffailureofthebridgedeckisdeterminedbytheFirstOrderSecondMoment(FOSM)methodofreliability.Athreespandoubleplanesymmetricalfantypecablestayedbridgeoftotalspan689m,isusedasanillustrativeexample.Thefragilitycurvesforthebridgedeckfailureareobtainedunderanumberofparametricvariations.Someoftheimportantconclusionsofthestudyindicatethat(i)notonlyverticalcomponentbutalsothehorizontalcomponentofgroundmotionhasconsiderableeffectontheprobabilityoffailure;(ii)groundmotionwithnotimelagbetweensupportexcitationsprovidesasmallerprobabilityoffailureascomparedtogroundmotionwithverylargetimelagbetweensupportexcitation;and(iii)probabilityoffailuremayconsiderablyincreaseforsoftsoilcondition.

简介：Three-dimensionalnonlinearaerodynamicstabilityanalysiswasappliedtostudytheaerodynamicstabilityofacable-stayed-suspension(CSS)hybridbridgewithmainspanof1400meters,andtheeffectsofsomedesignparameters(suchasthecablesag,lengthofsuspensionportion,cableplanearrangement,subsidiarypiersinsidespans,thedeckform,etc.)ontheaerodynamicstabilityofthebridgeareanalyticallyinvestigated.Thekeydesignparameters,whichsignificantlyinfluencetheaerodynamicstabilityofCSShybridbridges,arepointedout,andbasedonthewindstabilitythefavorablestructuralsystemofCSShybridbridgesisdiscussed.

简介：

简介：本文详细论述了高速接入技术的热点---CableModem技术的概念、特点、工作方式、技术标准及实际应用,着重从Internet高速接入方面作了介绍,并指出该技术蕴含的巨大发展潜力。

简介：

简介：

简介：

简介：

简介：本文较为详细地介绍了如何通过wingate代理软件,来共享cablemodem宽带上网的安装与配置操作.因它源于实践中摸索出的经验,因此具有较好的实用价值.

简介：Theapproximateeigenfrequenciesforthein-planevibrationsofacablestruc-tureconsistingofinclinedcables,togetherwithpointmassesatvariouspointswerecom-puted.Itwasdiscoveredthattheclassicaltransfermatrixmethodwasinadequateforthistask,andhencethelargerexteriormatriceswereusedtodeterminetheeigenfrequencyequation.Thenpredictionsofthedynamicsofthegeneralcablestructurebasedontheasymptoticestimatesoftheexteriormatricesweremade.

简介：TheREapplicationinaluminumbasealloy,auniquebranchofREapplicationinmetallurgyinChi-na,hasdevelopedrapidly.Boththeoutputandtech-niqueareinaleadingpositionintheworld.Particular-ly,theREapplicationinpowertransmissioncablehasmadeaconsiderableprogress.UptonowChinacanfabricatethreekindsofRE-containingconductors.Oneisahighconductivitycon-ductor;theothertwoarehighstrengthandheat-re-

简介：Boththeinplaneandout-of-planetransversevibrationsofaviscoelasticcablesubjectedtoaninitialstressdistributinguniformonthecrosssectionarestudied.Theconstitutionofthecablematerialisas-sumedtobeofthehereditaryintegraltype.Thepartialdifferential-integralequationsofmotionarederivedfirst.ThenbyapplyingGalerkin’smethod,thegoverningequationsarereducedtoasetofsecond-ordernon-lineardifferential-integralequationswhicharesolvedbyfinitedifferencenumericalintegrationprocedures.Finally,theeffectsoftheviscosityparameterandtheelaslicparameteronthetransientamplitudesofthefirstmodeareinvestigatedbynumericalsimulation.

简介：在过去的地震基于海底的电报的表演，在海床差错运动下面决定电报性能的一个分析方法在这篇论文被建议。首先，海底的电报的地震损坏的普通类型被总结，它包括差错运动，海底的山崩和海床土壤液化导致的海床排水量，等等。损坏类似于观察到跟随陆地地震的埋葬的管道的损坏。2006年12月26日的Hengchun地震被用作案例研究。M7.2地震在20:26北京时间在华南海发生了，并且引起了14国际海底的电报切断并且碎。结果证明建议方法预言类似于在Hengchun地震观察了那的损坏。基于水深度和海底的地震的大小的影响的参量的研究，阻止损坏到海底的电报的反措施被建议。

简介：