简介：AccordingtotheChineseGB50011-2001codeandtherecommendedprovisionsofFEMANEHRPandEUROCODE8,byusingshearwavevelocityandboreholedata,thesiteclassificationisevaluatedforatypicalsoftsoilsiteontheYantaiseacoast.Thesiteseismicgroundmotioneffectisanalyzedandtheinfluenceofthecoastalsoilondesigngroundmotionparametersisdiscussed.Theresultsshowthatthebriefsiteclassificationcannotrepresenttherealconditionsofasoftsoilsite;thesoftsoilonthecoasthasaremarkableimpactonthemagnitudeandspectrumofgroundmotionacceleration.Themagnificationonpeakaccelerationisbigger,however,duetothenonlineardeformationofthesoil.Themagnificationisreducednonlinearlywiththeincreaseofinputgroundmotion;thespectrumisbroadenedandthecharacteristicperiodelongatedonthesoftsoilsite.

简介：在这份报纸，扩大因素ks偷看有在在山东省上的班和地点上的不同exceedance概率的地面运动被分析从班地点的358地上凿穿和班的140地上凿穿收集的土壤层的地震反应数据估计地点。从结果，一个人能结束那1ks的scatter阴谋通常服从正常分布；有输入地面的力量的增加的2ks减少打手势，它比在班lI地点在班地点是更明显的；3随磨擦运动输入的基岩接口的深度的增加，为类地点，ks逐渐地增加直到到稳定的值深度什么时候到达直到约20米或更大。然而为班地点，ks对深度感觉迟钝；4为班地点的ks的一般水准是1.47，比在中国GB18306-2001的地震地面运动参数带状配列地图使用了那稍微大。另外，在在在山东省上的山峰地面加速的不同层次的班和地点上的kspreliminarily在纸被讨论。

简介：在这研究，有在从不同方向的地震刺激下面的连续甲板的扭曲的桥的可能的地震行为被调查。45？？

简介：在这研究，简化了数字模型被开发分析框架结构上的效果基于堆积组基础与粘弹性的dampers(VED)装备了的土壤结构相互作用(SSI)。首先，一个单个degree-of-freedom(SDOF)振荡器成功地被利用代替精力驱散结构考虑的SDOFSSI效果。相等的时期和系统的抑制比率随形式的紧张精力(MSE)的采纳用频率转移函数通过相似分析被获得技术。参量的分析被执行在VED的表演上学习SSI效果。然后平衡方程多，有就SSI效果而言的VED的degree-of-freedom(MDOF)结构在频率领域被建立。把古典正常模式基于联合系统的上层建筑拥有的假设，MDOF上层建筑是到通过公式推导由MSE技术的采纳承担在一个僵硬基础上的一套单个SDOF系统的decoupled。数字结果证明建议方法有的优点然而，减少计算费用保留令人满意的精确性。此处建议的数字方法能就SSI效果而言提供VED的效率的快评估。

简介：在结构性质的无常能在混合模拟导致不同回答。这些无常的效果的Quantification将使研究人员能估计从实验观察的结构的回答的变化。这由于致动器延期的存在为即时混合模拟(RTHS)提出挑战。模型在直角的随机的多项式的一个基础上输出说明模型无常的影响的多项式混乱扩大(PCE)工程。在这份报纸，PCE被利用从自由(SDOF)的单个度的即时混合模拟在最大的排水量上评估致动器延期的效果结构什么时候为在结构的性质的无常的财务。PCE是没有延期，首先申请了RTHS为系数决定PCE，样品点的数字以及方法的顺序计算。PCE然后与致动器延期被用于RTHS。平均数，变化和Sobol索引被比较并且讨论了为RTHS在无常quantification上评估致动器延期的效果。结果证明平均数和最大的排水量的变化分别地关于致动器延期线性地并且指数地增加。通过Sobol索引的敏感分析也显示当联合效果随致动器延期的增加增加时，单个随机的变量的影响减少。

简介：过去常在在当前的地震代码采用的基于力量的设计过程决定力量减小因素的最重要的参数是结构的韧性。为在一个灵活基础上支持的结构，韧性因素能被基础依从影响。在当前的代码给的韧性因素主要被分配忽略这研究的目的是在像栈的结构的韧性因素上估计SSI现象的意义的SSI并且因此的效果。像栈的结构的使变形的配置就非线性的时刻弯曲关系而言作为横梁元素的一个集合被理想化，当一个线性摇摇摆的模型被实现为支持的土壤建模时。用一套人工的记录，重复了线性、非线性的分析被逐渐地在非线性的分析增加加速的紧张到首先在线性、非线性的分析钢让步被观察的水平和相应于栈倒塌的水平执行。无弹性、有弹性的电阻之间的差别以排水量韧性因素被确定了。结果显示基础灵活性能减少系统的韧性并且忽视这现象可以在灵活地支持的R/C像栈的结构的地震表演的预言导致错误的结论。

简介：近差错的地面运动，潜在地与大振幅和典型速度搏动，可以显著地影响大量结构的表演。当前的学习针对在根据中国代码设计的核电厂设备上评估近差错的效果的安全含意。到这个目的，在有典型前面择向性的效果的岩石地点的一套nearfault地面运动在几个关键参数和反应系列上与特殊强调被检验。光谱与汉语和另外的代码设计系列一起的选择记录的比较被进行。使双性人正常化的反应系列以不同角落时期被利用导出原子设计系列。地点从典型破裂择向性记录导出的岩石上的原子设计系列被地震大小和破裂距离显著地两个都影响，这被结束。在要适应的代码需要指定的原子设计系列反映大地震的近差错的择向性效果。关键词近差错的地面运动-择向性-反应光谱-岩石地点-原子设计旁边支持了：不到资助号码50808168的中国的国家自然科学基础；不到资助号码2008087的Weihai的科技的部；不到资助号码8092029的北京自然科学基础

简介：TheWenchuanMS8.0earthquakeoccurredontheLongmenshanfaultwhichinclinesatadipangleexceeding60degrees.Sincemostthrustearthquakesoccuronfaultswithdipanglesofabout30degrees,itisenigmaticwhytheWenchuanearthquakeoccurredonsuchasteepfault.InthisstudyweuseasimplefiniteelementmodeltoinvestigatehowthestressstateinthefaultchangeswiththevariationofPoisson’sratio.Theresultsshowthat,withthePoisson’sratiointhefaultincreasing,themagnitudesoftheprincipalstressesincreaseandthemaximumshearstressdecrease,and,especially,theanglebetweenthemaximumprincipalstressandthefaultplanedecreases,whichwillenhancethedrivingforcetoovercomethefrictionalresistanceonthefault.TheincreaseofPoisson’sratiointhefaultmaybeanimportantfactortoaffecttheoccurrenceofthefaultearthquakeswithlargeanglesbetweenmaximumprincipalstressandfaultplane.

简介：Duetothelargescaleandcomplexityofcivilinfrastructures,structuralhealthmonitoringtypicallyrequiresasubstantialnumberofsensors,whichconsequentlygeneratehugevolumesofsensordata.Innovativesensordatacompressiontechniquesarehighlydesiredtofacilitateefficientdatastorageandremoteretrievalofsensordata.ThispaperpresentsavibrationsensordatacompressionalgorithmbasedontheDifferentialPulseCodeModulation(DPCM)methodandtheconsiderationofeffectsofsignaldistortionduetolossydatacompressiononstructuralsystemidentification.TheDPCMsystemconcernedconsistsoftwoprimarycomponents:linearpredictorandquantizer.FortheDPCMsystemconsideredinthisstudy,theLeastSquaremethodisusedtoderivethelinearpredictorcoefficientsandJayantquantizerisusedforscalarquantization.A5-DOFmodelstructureisusedastheprototypestructureinnumericalstudy.NumericalsimulationwascarriedouttostudytheperformanceoftheproposedDPCM-baseddatacompressionalgorithmaswellasitseffectontheaccuracyofstructuralidentificationincludingmodalparametersandsecondorderstructuralparameterssuchasstiffnessanddampingcoefficients.ItisfoundthattheDPCM-basedsensordatacompressionmethodiscapableofreducingtherawsensordatasizetoasignificantextentwhilehavingaminoreffectonthemodalparametersaswellassecondorderstructuralparametersidentifiedfromreconstructedsensordata.

简介：ThecouplingnumericalmodelbetweenastronomicaltideandtsunamiswasbuiltbasedonthedataoftheCOMCOTmodel,whichwasverifiedbytheJapan“3·11”tsunami.ThetsunamisourceoftheManilaseismictsunamiwasdesignedandcomputedtoanalyzetheriskoftsunamiwhichwillhappenintheGuangdongcoast.Accordingtotheresults,themaximumquantityofwaterincreasingandthetimeofthetsunamiarrivingattheGuangdongseacoastwerecalculated.Thecouplingsimulationbetweenastronomicaltideandtsunamishassignificantmeaningforevaluatingtheriskandearly-warningoftsunamisintheGuangdongcoastalarea.

简介：Experimentalevaluationofreinforcedconcretebeamspecimenswithdifferentcharacteristicsofreinforcementsubjectedtopushoverandcyclicloadingispresented.Plastichingerotationparametersaredeterminedbasedontheidealizationofpushoverandhysteresiscurvesofreinforcedconcretebeamspecimensconstructedintwopercentageofreinforcement(0.471%and0.71%)withdifferentductilecharacteristics.Theexperimentaltestresultsprovideacleardemarcationoftheeffectoftypesofloadingandthetypesofreinforcementonthenonlinearperformancecharacteristicsofbeamspecimens.Theseresultsarehelpfultoupdatethenonlinearmodelingparametersofbeamcomponentsforthespecifictypeofreinforcementusedintheconstructionofastructure.Theupdatednon-linearmodelingparametersofbeamcomponentsinlumpedplasticitymodelarecomparedwiththevaluesofASCE/SEI41-06(2007)usedfortheperformancebaseddesignofstructures.

简介：PastresearchershaveanticipatedtheoccurrenceofagreatearthquakeinthecentralHimalayasinthenearfuture.ThismaycauseseriousdamageintheKathmanduValley,whichsitsonanancientlakebedzone,withlacustrinesedimentsofmorethan500mdepth.Inthisstudy,thepredominantfrequencyofgroundmotionisevaluatedusingtheHorizontal-to-Vertical(H/V)spectralratiotechniqueandrecordingsofambientnoise.TheresultsoftheH/Vratioshowtwopeaksinabout20percentofthelocations,whicharedistributedmainlyinandaroundthecenterandnorthernpartoftheKathmanduValley.Thepredominantfrequenciesvaryfrom0.5Hzto8.9Hzinthestudyarea,whereasthesecondresonancefrequencyvariesfrom4Hzto6Hzinthecenterandnorthernpartofthevalley.Thisindicatesthatthecenterandnorthernpartofthevalleyhaveawiderangeofresonancefrequencyduetotwolevelsofimpedancecontrastonemaybefromthesurfacelayerandtheothermaybefromthelayerunderneath.ThesetwolevelsofresonanceindicatetheimportanceofconsideringtheeffectsofsurfaceandlowerlayersduringtheplanninganddesigningofinfrastructuresintheKathmanduValley.

简介：基于中国数字地震网络在最近的年里报导的地震目录，我们与表面波浪大小和本地大小选择地震并且适合他们进在二大小之间的一种关系。系统的差别从被用于30年的公式被发现。因为一个大动态范围和当前的数字观察系统的宽频率范围，除了与以前相比被使用的很多车站和地震，在这份报纸获得的关系似乎更可靠。我们的计算证明在大小变换前后没有重要差别因此我们建议大小变换的放弃。一个车站的地点反应在不同频率由扩大组成。扩大等于大约1并且在位于地下室的车站与频率改变很少岩石，和它在低频率范围比1大，不到1在位于沉积层的车站在高频率变化。来自位于沉积层的单个车站的大小和从整个网络的平均大小之间的差别增加从对否定与时期积极。看起来没有固定车站修正因素，车站修正方法不工作改进精确性和大小估计。

简介：Ｔｈｅｅｆｆｅｃｔｏｆｍａｇｎｅｔｉｃｆｉｅｌｄ－ｆｒｅｅｓｐａｃｅｏｎｔｈｅａｃｏｕｓｔｉｃｂｅｈａｖｉｏｒｏｆｂｕｄｇｅｒｉｇａｒｓ（Ｍｅ－ｌｏｐｓｉｔｔａｃｕｓｕｎｄｕｌａｆｕｓ）ＪＩＮ－ＣＨＡＮＧＪＩＡＮＧ１）（蒋锦昌），ＨＡＩ－ＱＩＡＮＧＪ...

简介：

简介：Twoaspectsofanewmethod,whichcanbeusedforseismiczoning,areintroducedinthispaper.Ontheonehand,theapproachtoestimatebvalueandannualactivityrateproposedbyKijkoandSellevollneedstousetheearthquakecatalogue.Theexistingearthquakecataloguecontainsbothhistoricalandrecentinstrumentaldatasetsanditisinadequatetouseonlyonepart.Combiningthelargenumberofhistoricaleventswithrecentcompleterecordsandtakingthemagnitudeuncertaintyintoaccount,Kijko’smethodgivesthemaximumlikelihoodestimationofbvalueandannualactivityrate,whichmightbemorerealistic.Ontheotherhand,thismethodconsidersthesourcezoneboundaryuncertaintyinseismichazardanalysis,whichmeanstheearthquakeactivityrateacrossaboundaryofasourcezonechangessmoothlyinsteadofabruptlyandavoidstoolargeagradientinthecalculatedresults.

简介：Itisknownthatstructuralstiffnessandstrengthdistributionshaveanimportantroleintheseismicresponseofbuildings.Theeffectofusingdifferentcode-specifiedlateralloadpatternsontheseismicperformanceoffixed-basebuildingshasbeeninvestigatedbyresearchersduringthepasttwodecades.However,noinvestigationhasyetbeencarriedoutforthecaseofsoil-structuresystems.Inthepresentstudy,throughintensiveparametricanalysesof21,600linearandnonlinearMDOFsystemsandconsideringfivedifferentshearstrengthandstiffnessdistributionpatterns,includingthreecode-specifiedpatternsaswellasuniformandconcentricpatternssubjectedtoagroupofearthquakesrecordedonalluviumandsoftsoils,theeffectofstructuralcharacteristicsdistributiononthestrengthdemandandductilityreductionfactorofMDOFfixed-baseandsoil-structuresystemsareparametricallyinvestigated.Theresultsofthisstudyshowthatdependingonthelevelofinelasticity,soilflexibilityandnumberofdegrees-of-freedoms(DOFs),structuralcharacteristicsdistributioncansignificantlyaffectthestrengthdemandandductilityreductionfactorofMDOFsystems.Itisalsofoundthatathighlevelsofinelasticity,theductilityreductionfactoroflow-riseMDOFsoil-structuresystemscouldbesignificantlylessthanthatoffixed-basestructuresandthereductionislesspronouncedasthenumberofstoriesincreases.

简介：Incorporatingrateandstatefrictionlaws,stabilityoflinearlystable(i.e.,withstiffnessgreaterthanthecriticalvalue)spring-slidersystemssubjectedtotriggeringperturbationswasanalyzedundervariablenormalstresscondition,andcomparisonwasmadebetweenourresultsandthatoffixednormalstresscasesrevealedinpreviousstudies.Forsystemsassociatedwiththesliplaw,thecriticalmagnitudeofratestepsfortriggeringunstableslipsarefoundtohaveasimilarpatterntothefixednormalstresscase,andthecriticalvelocitystepsscalewitha/(b-a)whenk=kcrforbothcases.Therate-stepboundariesforthevariablenormalstresscasesarerevealedtobelowerthanthefixednormalstresscaseby7%–16%forarelativelylargea=0.56with(b-a)/arangingfrom0.25to1,indicatingeasiertriggeringunderthevariablenormalstressconditionwithratesteps.Thedifferencebetweenfixedandvariablenormalstresscasesdecreaseswhentheavalueissmaller.Inthesamesliplaw-typesystems,criticaldisplacementstotriggerinstabilityarerevealedtobelittleaffectedbythevariablenormalstresscondition.WhenkCkcr(V*),aspring-slidersystemwiththeslownesslawismuchmorestablethanwiththesliplaw,suggestingthattheslownesslawfitsexperimentaldatabetterwhenasinglestatevariableisadopted.Instick-slipmotions,thevariablenormalstresscasehaslargerstressdropsthantheconstantnormalstresscase.Thevariablenormalstresshaslittleeffectontherangeofslipvelocityinsystemsassociatedwiththeslownesslaw,whereassystemsassociatedwiththesliplawhaveaslowestslipvelocityimmenselysmallerthanthefixednormalstresscase,by*10ordersofmagnitude.

简介：把压成薄片的弹性体的轴承广泛地在中国为small-to-medium-span高速公路桥被使用了，在哪个水泥砍钥匙横着被设置禁止大girder排水量。为了评估，更精确地衔接地震回答，轴承的合适的分析模型并且砍钥匙应该被开发。基于一系列周期的装载实验和分析，把压成薄片的弹性体的轴承的清醒的分析模型并且砍钥匙，能考虑机械降级，被开发。机械降级的效果被在大量山峰地面加速(针网阵列)下面在横向的方向检验一座small-to-medium-span桥的地震反应调查。为small-to-medium-span高速公路桥的损坏机制被决定，它能在最近的年里在地震期间解释地震损坏调查。把压成薄片的弹性体的轴承的机械性质将由于磨擦降级滑动的试验性的结果表演，而是减少的度依赖于影响参数。这能被结束把压成薄片的弹性体的轴承的机械降级并且砍钥匙在桥的地震反应起一个重要作用。把压成薄片的弹性体的轴承的机械性质的降级并且砍钥匙应该被包括评估更精确的桥牌地震性能。

简介：Theseismotectonicmethodisusedtostudytheseismogenicstructuresandthemaximumpotentialearthquakearoundanengineeringsiteinordertodeterminetheseismicriskatthesite.Analysisofseismicriskfromsiteeffectseismicintensitydata,incombinationwithregionalseismo-geologicaldata,usingtheseismotectonicmethodcanprovideamorereliableresult.Inthispaper,takingtheareaofsixreservoirdamsitesinwesternAnhuiasanexample,weanalyzetheseismicriskfromsiteeffectseismicintensitydataincombinationwiththeseismotectonicconditionsandfindthatP(I≥i)=10%over50years.Theresultshowsthattheseismogenicstructureandthemaximumpotentialearthquakehaveacontrollingeffectonseismicriskfromfutureearthquakesintheareaaroundthesite.