简介：监视任何结构的表演要求批评的点的位置的变化的即时大小。不同技术能被用于这个目的，一个出现优点和劣势。这种技术基于放系统(GPS，GLONASS和未来伽利略)的卫星似乎为长时期结构至少很有希望。GPS特别地提供能与高精确性追踪动态排水量的采样率。它的服务能力独立于大气的条件，温度变化和监视目标的可见性。这篇论文调查双频率GPS接收装置的大小的可靠性和精确性。一台线性电磁的马达沿着一个给定的方向移动一个目标。位置的变化与他们由GPS接收装置记录了的估计相比，其天线位于参考书目标。比较基于足够地长的记录。

简介：Basedontheseismicresponsecharacteristicsofspaceframestructures,anewtypeofseismicisolationbearingdefinedasathree-dimensionalseismicisolationbearing(3DSIB)isdevelopedinthispaper.Thebearingoffersexcellentpropertiessuchasmulti-dimensionalseismicisolation,reasonablerotationcapability,goodabilitytoresistliftingload,uncoupledstiffnessinhorizontalandverticaldirections,etc.Inthe3DSIB,thehorizontaldimensionisdesignedbycombiningtheTeflonslidingdeviceandhelicalspring,whiletheverticaldimensionisdevelopedbyintroducingdiskspringsorhelicalsprings.Themathematicalmodelofthe3DSIBwasestablishedanditsperformancewiththecriticalparameterswastestedonashakingtable.Furthermore,the3DSIBwasappliedina120mspanhangarstructureandsimulatedusingSAP2000softwaretoevaluateitsperformanceinpracticalstructures.Theperformanceofthestructureswithandwithout3DSIBwascompared.Itisshownthatthehangarstructurewith3Dbearingsachievesabetterperformance.Theaxialforceandaccelerationresponseofthestructureswith3DSIBareeffectivelyreduced,whilethedisplacementresponseofthebearingiswithinthepredeterminedrange.

简介：广泛的试验性、理论的研究研究被承担学习在一个主要机场的休息室要过去常的一个长跨度的对的具体地板系统的颤动有用性。明确地，跳影响测试被执行获得地板形式的参数，由山峰加速的分发的分析列在后面。跑的测试也被执行捕获加速回答。对的具体地板被发现有低基本自然频率(8.86Hz)相应于2.17%的平均形式的抑制比率。系数rp为跑为最大的root-mean-square加速的方便计算被建议。在理论分析，在运用刺激下面的对的具体地板与简单地支持的边被当作一个二跨度的连续各向异性的矩形的盘子。计算分析结果(自然频率和root-mean-square加速)与试验性的同意很好。分析途径因此被验证。

简介：Ｉｎｆｌｕｅｎｃｅｏｆｌｏｎｇｐｅｒｉｏｄｓｅｉｓｍｉｃｗａｖｅｓｉｎ┐ｄｕｃｅｄｂｙｔｈｅＴａｉｗａｎｌａｒｇｅｅａｒｔｈｑｕａｋｅｏｎＳｈａｎｇｈａｉａｒｅａＫＵＮ－ＹＵＡＮＺＨＵＡＮＧ（庄昆元）ＹＯＮＧ－ＬＩＮＸＵ（徐永林）ＪＩＡＮ－ＷＥＮＳ...

简介：Thelong-spanbridgeresponsetononstationarymultipleseismicrandomexcitationsisinvestigatedusingthePEM(pseudoexcitationmethod).Thismethodtransformsthenonstationaryrandomresponseanalysisintoordinarydirectdynamicanalysis,andtherefore,theanalysiscanbesolvedconvenientlyusingtheNewmark,Wilson-θschemesorthepreciseintegrationmethod.Numericalresultsoftheseismicresponseforanactuallong-spanbridgeusingtheproposedPEMaregivenandcomparedwiththeresultsbasedontheconventionalstationaryanalysis.Fromthenumericalcomparisons,itwasfoundthatboththeseismicspatialeffectandthenonstationaryeffectarequiteimportant,andthatbothstationaryandnonstationaryseismicanalysisshouldpayspecialattentiontothewavepassageeffect.

简介：新结构的材料的增加的力量和新结构的跨度，为更大的苗条由美学要求伴随了，正在导致长跨度的结构的更多的应用。在这份报纸，有用性控制技术和它的设计理论被学习。首先，一篇小说调节了质量更潮湿(TMD)与可控制的僵硬被开发。第二，为为导致人的负担建模的方法被建议，包括站起来，走，跳并且跑，并且为长跨度的地板反应的一个分析方法基于一个有限元素模型被建议。第三，为就人的舒适而言与一个多重TMD(MTMD)系统安装的长跨度的地板的一个设计方法被介绍，主要基于存在的研究文学。最后，一个图案，分析和领域测试包括北京奥林匹克派克公民会议中心，长沙新火车站和Xian在中国用几座大规模大楼被进行北火车站。分析并且MTMD系统用建议方法设计了的领域测试结果表演能够有效地减轻长跨度的地板结构的垂直颤动。在这份报纸介绍的学习为这些结构为类似的长跨度的地板的颤动有用性和控制系统的设计的分析提供重要引用。

简介：TherigidcentralbuckleemployedintheRunyangSuspensionBridge(RSB)wasthefirsttimeitwasusedinasuspensionbridgeinChina.ByusingaspectralrepresentationmethodandFFTtechniquecombinedwithmeasureddata,a3Dfluctuatingwindfieldconsideringthetowerwindeffectissimulated.AnovelFEmodelforbuffetinganalysisisthenpresented,inwhichaspecificuser-definedMatrix27elementinANSYSisemployedtosimulatetheaeroelasticforcesanditsstiffnessordampingmatricesareparameterizedbywindvelocityandvibrationfrequency.Anonlineartimehistoryanalysisiscarriedouttostudytheinfluenceoftherigidcentralbuckleonthewind-inducedbuffetingresponseofalong-spansuspensionbridge.Theresultscanbeusedasareferenceforwindresistancedesignoflong-spansuspensionbridgeswitharigidcentralbuckleinthefuture.

简介：在决定与形状记忆合金(SMA)使用结构的隔离的有效性考虑的关键点是组成的模型，SMA隔离设备和分析方法。在这份报纸，一个简化组成的模型基于粘性的经典理论被建议模仿SMA，马氏体体积部分在被看作州的变量之一的superelasticity的行为。在模拟结果和试验性的结果之间的比较被做并且显示建议组成的模型产出在对试验性的好同意的压力紧张曲线。因此，建议模型能正确地模仿收益机制和SMA的精力驱散能力。下次，以便充分利用SMA的superelasticity，由pre-tensionedSMA酒吧组成的新SMA隔离乾被介绍。然后，一个有限元素分析模型被建立根据它的配置模仿SMA隔离乾的行为并且简化了组成的模型。最后，为与SMA隔离乾安装的长跨度的结构的一个简化设计方法被建议，它进一步被用来调查空间格子结构的隔离效果。结果证明SMA隔离乾能有效地减少结构的地震回答，它显示建议SMA隔离方法的有效性。

简介：Becauseseismicactivitywithinmid-continentsisusuallymuchlowerthanthatalongplateboundaryzones,evensmallearthquakescancausewidespreadconcerns,especiallywhentheseeventsoccurinthesourceregionsofpreviouslargeearthquakes.However,thesesmallearthquakesmaybejustaftershocksthatcontinuefordecadesorevenlonger.TherecentseismicityintheTangshanregioninNorthChinaislikelyaftershocksofthe1976GreatTangshanearthquake.ThecurrentearthquakesequenceintheNewMadridseismiczoneincentralUnitedStates,whichincludesaclusterofM*7.0eventsin1811–1812andanumberofsimilareventsinthepastmillennium,isbelievedtoresultfromrecentfaultreactivationthatreleasespre-storedstrainenergyinthecrust.Ifso,thisearthquakesequenceissimilartoaftershocksinthattheratesofenergyreleaseshoulddecaywithtimeandthesequenceofearthquakeswilleventuallyend.WeusesimplephysicalanalysisandnumericalsimulationstoshowthatthecurrentsequenceoflargeearthquakesintheNewMadridfaultzoneislikelyendingorhasended.Recognizingthatmid-continentalearthquakeshavelongaftershocksequencesandcomplexspatiotemporaloccurrencesarecriticaltoimprovehazardassessments.

简介：Cable-membranestructureshavesmallrigidityandarehighlysensitivetowind.Structuralhealthmonitoringisnecessarytoensuretheserviceabilityandsafetyofthestructure.Inthisresearch,thedesignmethodofastructuralhealthmonitoringsystemisusingthecharacteristicsofacable-membranestructure.TakingtheYueyangSanheAirportTerminalasanexample,afiniteelementmodelisestablishedtodeterminethecriticalstructuralcomponents.Next,theengineeringrequirementsandtheframeworkofthemonitoringsystemarestudiedbasedontheresultsofnumericalanalysis.Thespecificimplementationofthestructuralhealthmonitoringisthencarriedout,whichincludessensorselection,installationandwiring.TheproposedframeworkissuccessfullyappliedtothemonitoringsystemfortheYueyangAirportterminalbuilding,andthesynchronousacquisitionoffiberBragggratingandaccelerationsensorsignalsisimplementedinaninnovativeway.Thesuccessfulimplementationandoperationofstructuralhealthmonitoringwillhelptoguaranteethesafetyofthecablemembranestructureduringitsservicelife.

简介：Basedonpreviousresearchresults,present-daycrustaldeformationandgravityfieldsintheChinesemainlandareanalyzedusingtheGPSdata,leveling,gravityandcross-faultdeformations.Weanalyzedstrainaccumulationofthemajorfaults,andidentifiedlockedorhighstrainaccumulationsegments.Combiningtheeffectsoflargeearthquakesinthestudyarea,thelong-term(decade)probabilityoflargeearthquakesintheChinesemainlandisestimated.

简介：Inthispaperwepresentacomparativeanalysisofglobalfrequencyandlocaldeformationdataforalargeconcretebridge.Theasymptoticprobabilitydistributionsofthecentralstatisticsarepresented,andcomparedwithempiricalbootstrapestimates.Bootstrappeddistributionsarecalculatedfromreferencedataobtainedduring1999-2000andusedtodevelopchange-pointalarmcriteriaforthestructure,usingreasonablesensitivitymeasuresdevelopedfromFEMsimulationsandstructuralanalysis.Theimplicationsofthefrequencydataarediscussedinconjunctionwiththestrainanddisplacementmeasurementsinordertodiscerniftheloadcarryingcapacityofthebridgehasbeenaffected.Thecriticalneedformoreadvancedtemperaturecompensationmodelsforlargestructurescontinuallyinthermaldisequilibriumisdiscussed.

简介：当前的实践使用预兆的模型外推长时期的反应系列基于在中等、弱的地震的远地的记录。然而，系列不足够长，数据经常不是可靠的，它意味着地震设计代码不能精确地为长时期的结构定义地震设计要求。近地的记录罪恶假装聪明的地震主要吃惊有大signal-to-noise比率(SNR)，它为学习长时期的加速反应光谱直到20秒使他们合适。来自在原因的差错的120km以内的246个车站的Theacceleration反应系列统计上在这篇论文被分析。long-periodresponse光谱上的距离和地点条件的影响被讨论，并且扩大系列的形状与在中国的地震设计代码指定的标准系列相比。最后，为到代码的未来修订的建议被建议。

简介：为了解决在控制设备存在的不同时间延期，在空间结构上安装了，在这研究，用2N的分离分析精确算法被选择基于基于市场的控制(MBC)为长跨度的结构解决multi-time-delay问题方法。间隔的概念混合了精力从计算结构的力学和最佳的控制研究区域被介绍，并且它把MBCmulti-time-delay控制器的设计翻译成片断矩阵的一个解决方案。这条途径在空间及时转变连续算法到并行计算，极大地改进解决的效率和数字稳定性。设计控制器能与线性控制力量联合考虑时间延期的问题并且为大时间延期条件是特别有效的。长跨度的结构的一个数字例子被选择表明介绍控制器的有效性，并且时间延期被发现在结果上有重要影响。

简介：ThecycleprocessofthetidalforcenichefortheLudianMs6.5earthquakeoccurringinLudianCounty,YunnanProvince,ChinaonAugust3,2014wascalculated.Theearthquakeoccurrednearthemiddlepointphase.Itindicatesthatthetypeofseismogenicfaultthatthetideforceactedonbelongstothethrustfault.Accordingtothetidalnichecycle,theabnormalOLR(OutgoingLong-waveRadiation)changewasanalyzedbasedonNOAAsatellitedataaroundthewholelandareaofChinabeforeandaftertheearthquake.TheresultshowsthattheOLRchangedevidentlywithtideforcechange.Temporally,thechangewentthroughtheevolutionprocessofinitialOLRrise→strengthening→abnormalpeaking→attenuation→returningtonormal；andspatially,theabnormalareawounditswayalongtheZhaotong-Ludianfaultandwentthroughascattered→conversion→scatteredprocess.Thisprocessissimilartothechangeprocessofrockbreakingunderstressloading.TheresultsindicatethatthetidalforceofacelestialbodycouldtriggeranearthquakewhenthetectonicstressreachesitscriticalbreakingpointandtheOLRanomalyisproportionaltotheseismictectonicstresschange.ItisofgreatusetocombineOLRandtidalforceinearthquakeprecursoryobservation.

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：Thispaperstudiesthree-dimensionaldiffractionofobliquelyincidentplaneSHwavesbytwininfinitelylongcylindricalcavitiesinlayeredporoelastichalf-spaceusingindirectboundaryelementmethod.Theapproachisvalidatedbycomparisonwiththeliterature,andtheeffectsofcavityinterval,incidentfrequency,andboundarydrainageconditiononthediffractionarestudiedthroughnumericalexamples.Itisshownthat,theinteractionbetweentwocavitiesissignificantandsurfacedisplacementpeaksbecomelargewhentwocavitiesareclose,andthesurfacedisplacementmaybesignificantlyamplifiedbytwincavities,andtheinfluencerangewithlargeamplificationcanbeaswideas40timesofthecavityradius.Surfacedisplacementsindryporoelasticcaseandsaturatedporoelasticcaseswithdrainedandundrainedboundariesareevidentlydifferentundercertaincircumstances,andthedifferencesmaybemuchlargerthanthoseinthefree-fieldresponse.

简介：TemporalchangesinsiteeffectsareobtainedusingtheHVSR(horizontal-to-verticalspectralratio)methodandstrongmotionrecordsaftertheMw7.6Chi-Chiearthquake,Taiwan.Seismicdatarecordedbetween1995and2010areused,comprising3,708datafrom15stationsadjacenttotheChelungpufault.Temporalfluctuationsaredeterminedbyanalyzingthesiteeffectvariationusingatime–frequencyvariation(TFV)diagrambasedontheseseismicdata.Stationsadjacenttothefaultshowsignificantdisturbancesintheresonancefrequencyat16–26Hz.StationTCU129showsa40%dropinfundamentalfrequencyafterthemainshock,andagradualreturntotheoriginalstateovernineyears.Forstationslocatedfartherfromthefaultzone,suddenchangesintectonicstressplayadominantroleintemporalchangestotheHVSR.Animpactanalysisofthedirectionalfactorconfirmsourfindingthattheproximityofthefaulttoseismicstationshasthemostinfluenceondata.

简介：Alargeearthquake(MW=7.6)occurredinJiji(Chi-Chi),Taiwan,ChinaonSeptember20,1999,andwasfollowedbymanymoderate-sizeshocksinthefollowingdays.TwoofthelargestaftershockswiththemagnitudesofMW=6.1andMW=6.2,respectively,wereusedasempiricalGreen(sfunctions(EGFs)toobtainthesourcetimefunctions(STFs)ofthemainshockfromlong-periodwaveformdataoftheGlobalDigitalSeismographNetwork(GDSN)includingIRIS,GEOSCOPEandCDSN.FortheMW=6.1aftershockofSeptember22,therewere97pairsofphasesclearenoughfrom78recordingsof26stations;fortheMW=6.2aftershockofSeptember25,therewere81pairsofphasesclearenoughfrom72recordingsof24stations.Foreachstation,2typesofSTFswereretrieved,whicharecalledP-STFandS-STFduetobeingfromPandSphases,respectively.Totally,178STFindividualswereobtainedforsource-processanalysisofthemainshock.Itwasnoticedthat,ingeneral,STFsfrommostofthestationshadsimilaritiesexceptthatthoseinspecialazimuthslookeddifferentoroddduetothemechanismdifferencebetweenthemainshockandtheaftershocks;andindetail,theshapesoftheSTFsvariedwithazimuth.BothofthemreflectedthestabilityandreliabilityoftheretrievedSTFs.ThecomprehensiveanalysisofthoseSTFssuggestedthatthiseventconsistedoftwosub-events,thetotaldurationtimewasabout26s,andontheaverage,thesecondeventwasabout7slaterthanthefirstone,andthemoment-rateamplitudeofthefirsteventwasabout15%largerthanthatofthesecondone.