简介：Thispaperstudiesthetemporalandspatialdistributionofgreatglobalearthquakes(MW≥8.0)since1900.Wecomparethetwoperiodsofupsurgesofgreatearthquakesoccurringinthemiddleoflastcenturyandbeginningofthiscentury.Theformerperiodtookplacebetween1950and1965duringwhich13greatearthquakes(MW≥8.0)occurred,includingthreeeventswithmomentmagnitudegreaterthan9.0.Thelargestmagnitudeinthisperiodreached9.6.Thelatterperiodstartsfromthebeginningofthiscentury.Inlessthan12years,15greatearthquakeshaveattackedtheworldwiththelargestmagnitudebeingMW9.1.Onthebasisofcomparisonbetweenthesetwoupsurgesofglobalearthquakeactivity,weinferthattheongoinghighlevelofearthquakeactivitymaycontinueforanotherfiveyearsorso.Numerousgreatearthquakes(MW≥8.0)andmanylargeearthquakes(MW6.0~7.0)willoccurgloballyinthesefiveyears.Inaddition,thispaperalsodiscussestherelationshipsbetweenearthquakeactivityalongtheSumatrasegmentoftheIndian-AustraliaplateboundaryandthatintheBayankalablockinthemiddleofQinghai-Tibetanplateauaswellasintheblocksofthesouthernplateau.TheresultsindicatethattheQinghai-Tibetanplateau,inparticularitsmiddleandsouthernparts,isalikelyplaceforfutureearthquakesofmagnitudeover7.0.

简介：Thephysicalmeasuresofmacroscopicseismicintensityhavebeenextensivelystudiedbasedonthenewunderstandingofseismicintensityandthenewanalyticalmethodandnewdatabaseofstronggroundmotion.Newphysicalmeasuresofseismicintensityhavebeenproposed.

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简介：InthispapertheshortagesofexplanationsonthecauseofTangshanearthquakesin1976arepointedout.Earth-quakephenomenaaroundTangshanearthquakesareanalyzedsynthetically,itisnoticedthatthemostprominentseismicphenomenonareseismicdensenessofML=4,butML=3andML=2isnotactiveinthesametemporal-spatialinterval,whichoccurredfrom1973to1975.Wethinkthatthephenomenonshouldcorrespondtorelativeintegrityofthecrustmediumunderhigherregionalstress.AssumingthattheseismicityincircumjacentregioncouldreflectthejostlingextentofsurroundingplatestowardtheChinesemainland,itisinferredthattherearemulti-dynamicalprocessesinNorthChinaregionin1970s,whichsupplythebasicdynamicalsourcetoTangshanearthquakes.Amodelofmulti-dynamicalprocessesandlocalweakeningofthecrustisproposedtoexplainthecauseofTangshanearthquakes.ThismodelcouldunpuzzlemanyseismicphenomenarelatedtoTangshanearthquakes.

简介：Theconceptofstatevectorstemsfromstatisticalphysics,whereitisusuallyusedtodescribetheevolutionofacontinuumfieldinitswayofcoarse-graining.Inthispaper,thestatevectorisemployedtodepicttheevolutionofseismieityquantitatively,andsomeinterestingresultsarepresented.Theauthorsinvestigatedsomefamousearthquakecases(e.g.,theHaiehengearthquake,theTangshanearthquake,thewestKuulunMountainsearthquake,etc.)andfoundthatthestatevectorsevidentlychangepriortotheoccurrenceoflargeearthquakes.Thusitisbelievedthatthestatevectorcanbeusedasakindofprecursortopredictlargeearthquakes.

简介：一个新人工的边界模型基于多方向性的播送和粘滞春天的人工的边界理论被建议在动态分析专心于压力波浪一个浸透的土壤基础。后来砍波浪(S波浪)是在一个浸透的土壤基础和一个单相的中等基础的一样，为一个单相的中等基础的一个正切的粘弹性的边界条件能也被用于浸透的土壤基础。因此，人工的边界的目的在这建议纸主要是专心于P波浪的二种类型一个浸透的土壤基础。主要想法是在浸透的土壤基础的P波浪的压力被分解成二种类型。应力的第一种类型，ra，被第一条人工的边界吸收。应力的第二种类型，rb，被第二条人工的边界产生的压力平衡。最终，P波浪(fast-P-waves和slow-P-waves)的两种类型被在这份报纸建议的人工的边界模型吸收。特别地，注意fast-P-waves和slow-P-waves在第一条边界的位置被吸收。因此，此处建议的人工的边界模型能同时吸收P快的波浪，P慢的波浪并且砍波浪。最后，一个数字例子被给检查建议人工的边界模特儿，并且结果证明它是很精确的。

简介：混合模拟是为评估结构的系统的地震性能的一个强大的测试方法。这个方法使，结构的仅仅批评的部件试验性地被测试，可行。这份报纸为被瞄准扩大它的能力到存在方法遇到一些限制的大量系统的地震混合模拟论述一个最新建议的集成算法。在建议方法，它被称为可变时间步(vt)集成方法，一个含蓄的计划被在试验性的元素上消除反复的阶段为混合模拟采用，在常规含蓄的应用必要的阶段。以便学习VTS方法的有效性，一系列数字调查被进行它在获得精确、稳定、收敛的回答显示出VTS方法的成功。在一条比较途径，然后，在通常使用的集成方法上的VTS方法的改进精确性被表明。VTS方法的稳定性也被学习，结果证明它提供有条件的稳定性；然而，它的稳定性限制在精确性限制以外好。VTS方法结果上的时间延期的效果也被调查，VTS方法在处理这个试验性的错误是相当成功的，这被显示出。

简介：Sandwichmasonrywallsarewidelyusedasenergy-savingpanelssincetheinterlayerbetweentheouterleavescanactasaninsulationlayer.Newtypesofsandwichwallsarecontinuallybeingintroducedinresearchandapplications,andduetotheiruniquebondpatterns,experimentalstudieshavebeenperformedtoinvestigatetheirmechanicalproperties,especiallywithregardtotheirseismicperformance.Inthisstudy,threenewtypesofsandwichmasonrywallhavebeendesigned,andcycliclateralloadingtestswerecarriedoutonfivespecimens.Theresultsshowedthatthespecimensfailedmainlyduetoslippagealongthebottomcracksorthedevelopmentofdiagonalcracks,andthefailurepatternswereconsiderablyinfluencedbytheaspectratio.Analysiswasundertakenontheseismicresponseofthenewwalls,whichincludedductility,stiffnessdegradationandenergydissipationcapacity,andnoobviousdifferencewasobservedbetweentheseismicperformanceofthenewwallsandtraditionalwalls.Comparisonsweremadebetweentheexperimentalresultsandthecalculatedresultsoftheshearcapacity.ItisconcludedthattheformulasinthetwoChinesecodes(GB50011andGB50003)aresuitableforthecalculationoftheshearcapacityforthenewtypesofwalls,andtheformulainGB50011tendstobemoreconservative.

简介：Inthispaper,anewhybridcontroltechnique,basedonacombinationofbase-isolationandsemi-activevariablestiffness/dampinginasuperstructure,ispresented.Toillustratetheefficiencyoftheproposedcontrolsystem,modeltestsonamini-electromagneticshakingtableandanumericalsimulationwereperformed.Thetestandnumericalcalculationresultsindicatethatthisnewhybridcontrolmodewithadditionaldampingandsmalleradditionalstiffnesscanachieveabettercontrolefficiency.

简介：在这篇论文，评估along-wind-induced的一个分析框架一个传播塔的动态回答被介绍。二个分析模型和一个新方法被开发：(1)一个更高的模式概括了力量光谱(GFS)传播塔的模型被推出；(2)包括更高的模式的贡献的一个分析模型进一步作为一个合理代数学的公式被导出估计结构的排水量反应；并且(3)一条新途径，与排水量(ALD)使用负担而不是力量，塔被给解决传播的内部力量。不同于常规方法，ALD方法能避免计算相等的静态的风负担(ESWL)。最后，传播塔结构被用作一个数字例子验证ALD方法的可行性和精确性。

简介：工业化大楼系统(IBS)最近被介绍最小化工程建设的时间和费用。因此，在IBS结构保证预制部件的连接的集成是保证从地震，车辆，和机械受到动态负担的大楼的稳定性的一个重要因素。然而，结构的工程师仍然在合适的连接上缺乏知识，IBS的详细关节组织建设。因此，这研究建议为抵抗multidirectional的动态负担的一个特殊预制具体铺满地板的连接系统强加了负担和还原剂颤动效果(PI2014701723)。这个系统被设计由使用二钢连接二块邻近的预制的墙面板U字形的隧道(即，男、女的关节)。在扔期间，每个关节在考虑下列条件以后为加入被改编进一块各自的墙面板：钢隧道的一个方面通向面板的厚度脸；U字形的橡胶在二条隧道之间被实现驱散颤动效果；并且螺栓和坚果被用来创造在二条U字形的男、女的钢隧道之间的延期。预制的墙的发达有限元素模型受到周期的负担在强加的动态负担期间评估建议连接的表演。连接性能当时基于在塑料范围的能量驱散，压力，变丑，和具体损坏与常规连接相比。建议预制连接能够超过受到动态负担的预制的墙的能量吸收，从而在所有主要方向改进它的抵抗行为。

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简介：一个过程被建议输入和hysteretic精力系列由此开发了钢时刻抵抗因为single-degree-of-freedom(SDOF)系统被用于multi-degree-of-freedom(MDOF)，装裱。建议过程用四个框架被验证，viz，有三的框架--，五--，seven-stories,并且其各个受到差错正常和三实际地震的差错平行部件九故事。为三故事、五故事的框架的很好的估计，和相当可接受的估计为七--，并且九故事的框架，被获得了。为在框架高度上散布hysteretic精力的一个方法也被建议。这个分发计划允许一个建议基于精力的地震图案(EBSD)的精力需求部件的决心为每个故事的过程。探讨EBSD的能力部件，一个故事明智的优化设计过程被利用为这些时刻框架从塑料绞链形成/旋转驱散能力的精力开发。建议EBSD过程在一个三故事的一个海湾钢时刻框架的设计被表明。

简介：Buildingcodeshavewidelyconsideredtheshearwavevelocitytomakeareliablesubsoilseismicclassification,basedontheknowledgeofthemechanicalpropertiesofmaterialdepositsdowntobedrock.Thisapproachhaslimitationsbecausegeophysicaldataareoftenveryexpensivetoobtain.Recently,otheralternativeshavebeenproposedbasedonmeasurementsofbackgroundnoiseandestimationoftheH/Vamplificationcurve.However,theuseofthistechniqueneedsaregulatoryframeworkbeforeitcanbecomearealisticsiteclassificationprocedure.ThispaperproposesanewformulationforcharacterizingdesignsitesinaccordancewiththeAlgerianseismicbuildingcode(RPA99/ver.2003),throughtransferfunctions,byfollowingastochasticapproachcombinedtoastatisticalstudy.Foreachsoiltype,thedeterministiccalculationoftheaveragetransferfunctionisperformedoverawidesampleof1-Dsoilprofiles,wheretheaverageshearwave(S-W)velocity,Vs,insoillayersissimulatedusingrandomfieldtheory.Averagetransferfunctionsarealsousedtocalculateaveragesitefactorsandnormalizedaccelerationresponsespectratohighlighttheamplificationpotentialofeachsitetype,sincefrequencycontentofthetransferfunctionissignificantlysimilartothatoftheH/Vamplificationcurve.ComparisonisdonewiththeRPA99/ver.2003andEurocode8(EC8)designresponsespectra,respectively.Intheabsenceofgeophysicaldata,theproposedclassificationapproachtogetherwithmicro-tremormeasurescanbeusedtowardabettersoilclassification.

简介：Thispaperpresentsastep-by-stepprocedureusingthethree-dimensionalboundaryelementapproachtostudythebehaviorofsemi-circularcanyonsunderseismicshearwaves.TheboundaryelementcodeTDASCallowsutilizationforvariouscanyongeometries,evaluationofconcurrentseismicwavesandcalculationofthegroundmotionsoncanyonsduetoanexcitationatanyarbitrarypointoftheincidentfield.Consideringthewideningratioofthecanyon(includingprismatic,semi-prismaticandnon-prismaticcanyons),wavecharacteristics(wavelength,dimensionlessperiod,direction)andmaximumamplificationpattern,thesolutionwasappliedtocarryoutaseriesofparametricstudies.Itwasshownthatcanyonformcansignificantlyaffectthedisplacementamplification,especiallyatthepointslocatedonitsedges.Byincreasingthewavedimensionlessfrequency(η>1),theamplificationpatternbecomesmorecomplex.Onthebasisoftheresultsfromavarietyofconsideredcases,anewexpressionhasbeenpresentedforthelimitingwavelengthbeyondwhichthewideningofthecanyonwillnothaveamajoreffectonthedisplacementamplification.Toverifythereliabilityoftheproposedapproach,theobtainedresults,expressedintermsofdisplacementamplitude,werecomparedwiththosefromtheavailablepublishedliteratureandareasonablygoodagreementwasobserved.

简介：TakingtheHuaihetotheNvshanhusegmentoftheTanlu(Tancheng-Lujiang)faultzoneasthemainresearchtargettoexplorewhethertherehasbeennewactivitysincethelateQuaternary,andbasedontheinterpretationofremotesensingimagesandrepeatedsurfaceinvestigations,weexcavatedtrenchesatthesectionswherethetectoniclandformissignificant,identifiedandrecordedthedeformationpatternsofthefaultandanalyzedtheactivitybehavior.Samplesofnewactivityanddeformationwerecollectedandorientedslicesweregroundbasedonthesamples'originalstatetomakethemicrostructuralanalysisanddemonstration.Alloftheaboveresearchshowsveryclearlineartectonicgeomorphologyalongthefault,threetrenchesacrossthefaultzoneallrevealednewdeformationtracessincelateQuaternary.ThelateststratumdislocatedbythefaultisthelateQuaternaryandHolocene.Themainslipmodeisstickslip,asrepresentedtypicallybyfaultscarps,wedgeaccumulation,thefaultsandthefilledcracksandsoon.Ingeneral,itshowsthecharacteristicsofbrittlehigh-speeddeformationandbelongstotheprehistoricearthquakeruins.Theaboveunderstandingwasconfirmedpartiallybymicroscopicanalysis.Inaddition,thesimilaritiesanddifferencesandthepossiblereasonsforthecharacteristicsofthelatestactivitiesoftheTancheng-LujiangfaultzoneinthenorthandsouthoftheHuaiheRiverregionsarealsodiscussedinthispaper.

简介：Thepost-earthquakerapidaccurateassessmentofmacroinfluenceofseismicgroundmotionisofsignificanceforearthquakeemergencyrelief,post-earthquakereconstructionandscientificresearch.TheseismicintensitydistributionmapreleasedbytheLushanearthquakefieldteamoftheChinaEarthquakeAdministration(CEA)fivedaysafterthestrongearthquake(M7.0)occurredinLushanCountyofSichuanYa’anCityat8:02onApril20,2013providesascientificbasisforemergencyrelief,economiclossassessmentandpost-earthquakereconstruction.Inthispaper,themeansforblindestimationofmacroscopicintensity,fieldestimationofmacrointensity,andreviewofintensity,aswellascorrespondingproblemsarediscussedindetail,andtheintensitydistributioncharacteristicsoftheLushan'4.20'M7.0earthquakeanditsinfluentialfactorsareanalyzed,providingareferenceforfutureseismicintensityassessments.

简介：TheFederalHighwayAdministration(FHWA)sponsoredalarge,multi-yearprojectconductedbytheMultidisciplinaryCenterforEarthquakeEngineeringResearch(MCEER)titled"SeismicVulnerabilityofNewHighwayConstruction"(MCEERProject112),whichwascompletedin1998.MCEERcoordinatedtheworkofmanyresearchers,whoperformedstudiesontheseismicdesignandvulnerabilityanalysisofhighwaybridges,tunnels,andretainingstructures.Extensiveresearchwasconductedtoproviderevisionsandimprovementstocurrentdesignanddetailingapproachesandnationaldesignspecificationsforhighwaybridges.Theprogramincludedbothanalyticalandexperimentalstudies,andaddressedseismichazardexposureandgroundmotioninputfortheU.S.highwaysystem;foundationdesignandsoilbehavior;structuralimportance,analysis,andresponse;structuraldesignissuesanddetails;andstructuraldesigncriteria.

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：在这研究，一个新lumped-mass-stick模型(LMSM)基于象特征值和特徵向量那样的结构的形式的特征被开发。简化模型，把频率称为适应lumped-massstick模型，hasonly棍子元素和节点到的一个小数字提供结构的一样的自然频率并且被用于一座原子抑制大楼。调查LMSM的数字表演，时间历史分析在LMSM和有限元素模型上被执行(女性)为一座原子抑制大楼。结果的比较证明LMSM的动态回答与FEM的那些以排水量和加速几乎相同。另外，结果也以在某些举起的floor反应系列在好同意。