简介:一、地震基本参数表1 地震基本参数表发震时间年月日时分秒震 中 位 置微 观宏 观东经北纬东经北纬参考地名震级(ML)震源深度(Km)震中烈度 地震类型 198810310612119°29′25°39′1194°257°福清县城西南409Ⅴ孤立型 微观震中与宏观震中基本吻合,如图1所示,仅有4公里左右的偏离。二、地震烈度分布图12-1为根据现场调查所勾划出的地震等震线图。划分出Ⅴ、Ⅳ、Ⅲ三个烈度区。图12-1 1988年10月31日福建福清地震等震线图Ⅴ度区:为极震区。Ⅴ度等震线经过福清的龙溪,宏路,油圹,安民,柏渡等地,呈长轴北北东向的椭圆形,长轴长约17公里,短轴12公里,面积150平
简介:六个增强的具体框架与或没有石工技术填入在水平周期的负担下面被构造并且测试。所有六个框架有在列的横向的加强被没为可锻的框架遇见currentACI说明的矩形的箍在提供的相同细节。为比较目的,在三个这些框架的列是由carbon-fiber-reinforced-polymer(CFRP)的jacketed避免的表可能砍失败。Anonlinear闲差事分析,单个元素的力量变丑关系基于ACI318,FEMA356,和陈在被形成“s模型,为这些框架并且与测试结果相比被执行。这些框架的行为上的填入的失败机制和影响在学习被检验。从现在的分析的结论为infilled水泥框架大楼结构的评估和设计向结构的工程师提供珍贵信息。
简介:Theconceptofstatevectorstemsfromstatisticalphysics,whereitisusuallyusedtodescribetheevolutionofacontinuumfieldinitswayofcoarse-graining.Inthispaper,thestatevectorisemployedtodepicttheevolutionofseismieityquantitatively,andsomeinterestingresultsarepresented.Theauthorsinvestigatedsomefamousearthquakecases(e.g.,theHaiehengearthquake,theTangshanearthquake,thewestKuulunMountainsearthquake,etc.)andfoundthatthestatevectorsevidentlychangepriortotheoccurrenceoflargeearthquakes.Thusitisbelievedthatthestatevectorcanbeusedasakindofprecursortopredictlargeearthquakes.
简介:一、地震基本参数表1 地震基本参数表发震时间年月日时分秒震 中 位 置微 观宏 观东经北纬东经北纬参考地名震级(MS)震源深度(Km)震中烈度 地震类型 199705311451117°11′25°35′117°11′25°34′永安西南526Ⅵ前主余震型 宏观震中与微观震中基本吻合,稍偏南1分。二、地震烈度分布本次地震震中位于永安市小陶镇张家山一带,震中烈度Ⅵ度强。Ⅵ度区:为极震区。Ⅵ度等震线北起永安市小陶镇大陶村,东至漳平市的赤水镇,南经龙岩市新罗区万安镇的安前村,西到连城县曲溪镇的古白石村,呈长轴北东走向的准椭圆形。长轴长38公里,短轴宽24公里,面积约700平方公里(见图23-1)。
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:Macroscopicanomaliesfrom"EarthquakeCasesinChina"arestatisticallyanalyzedinthispaper.Theconclusionisasfollows:Theprobabilityofoccurrenceofmacroscopicanomaliesbeforeearthquakesincreaseswithmagnitude.Thelargertheearthquakemagnitude,themoremacroscopicanomaliesappear.Thetemporaldistributionofmacroscopicanomaliesisasfollows:Therearefewmacroscopicanomaliesatbeginning;astimegoeson,thenumberofmacroscopicanomaliesincreases;theincreaseofmacroscopicanomalyquantityaccelerateswiththeimpendingearthquakeandreachesaclimaxwhentheearthquakebreaksout.Thespatialdistributionpatternofmacroscopicanomaliesisasfollows:macroscopicanomaliesappearattheepicenteratthebeginning,thenspreadout,andfinallyariseexplosivelyattheepicenterarea.
简介:Afrequencyandspatialdomaindecompositionmethod(FSDD)foroperationalmodalanalysis(OMA)ispresentedinthispaper,whichisanextensionofthecomplexmodeindicatorfunction(CMIF)methodforexperimentalmodalanalysis(EMA).ThetheoreticalbackgroundoftheFSDDmethodisclarified.Singularvaluedecompositionisadoptedtoseparatethesignalspacefromthenoisespace.Finally,anenhancedpowerspectrumdensity(PSD)isproposedtoobtainmoreaccuratemodalparametersbycurvefittinginthefrequencydomain.Moreover,asimulationcaseandanapplicationcaseareusedtovalidatethismethod.
简介:越过在为印度尼西亚地震的印度尼西亚下面的地球结构的S波浪速度通过震动图分析被调查了,同时在时间领域和三个笛卡儿的部件。数据在DAV观察车站被记录,菲律宾。主要数据集合是震动图比较在之间测量并且合成震动图而不是旅行时间数据,当通常在另外的地震学上的研究使用了。合成震动图用GEMINI方法被计算,它在一种古灵长类动物的全球地球披风给背离合成震动图并且更早有的震动图比较表演上面等价于模式Summation.The到达时间比那些测量。在上面的披风层的h的坡度被改变进在一种古灵长类动物模型说了的一个积极,而非否定的斜坡,并且否定修正在所有地球披风层被强加到多项式的系数的零份订单。优秀试穿,以及旅行时间或波形,从爱和瑞利,的表面波浪被获得表面象核心一样向S和SS披风波浪招手地球披风分开的反映的waves.This结果快车,由于在印度和亚洲之间的碰撞构造释放地区,地球披风层在所有在S波浪速度和垂直anisotropy有一个否定异例。
简介:一种技术到的二重要延期为一个明确的假动态算法执行非线性的错误繁殖分析(Chang,2003)被介绍。一个人从给定的时间步扩大稳定性学习到一个完全的一步一步的集成过程。它是证明的经分解那条保证稳定性条件在每次,步导致全部一步一步的集成过程的稳定的计算。非线性的错误繁殖结果的另外的延期表演,它为自由(SDOF)的非线性的单个度被导出系统,能被用于自由(MDOF)的非线性的多重度系统。这个应用程序依赖于系统在的自然频率的决心每次走,自从所有数字性质和错误繁殖,在时间步的性质是仔细与这些频率有关。结果从非线性的步度被导出。非线性的即时度被介绍代替非线性的步度并且被显示在实践易用。延期能也被用于基于非线性,和因此步力量适当地被选择在测试以前执行假动态测试的一时间的即时度从一个SDOF系统导出的结果。
简介:Steel-concretecompositestructuresthatsharetheadvantagesofbothsteelstructureandconcretestructurehavebeendevelopedrapidlyandusedwidely.Ithasbeenapopularstructureinhigh-risebuildingsinrecentyears.Althoughmoreandmorecompositestructureshavebeenusedinearthquakearea,onlyafewliteraturesaboutfragilityanalysisofthistypeofstructureareavailable.Inthispaper,afragilityanalysismethodbasedonperformanceisproposed,inwhichboththeuncertaintyduetovariabilityinstructuresandgroundmotionareconsidered.Seismicfragilityanalysisisperformedfora15-storycompositebeam-concrete-filledsquaresteeltubecolumnframebytheproposedmethod.Thetop-drift-angleandthestory-drift-angleareusedasquantitativeindexestodefinethefourdifferentperformancelevels.Thenseismicdemandprobabilityanalysisiscarriedoutandfragilitycurvesarederivedtoassesstheseismicperformanceofthistypeofstructure.
简介:Basedonthesitehistoricalearthquakedata,amethodofseismicriskanalysisispresented.Oncethefrequencyofearthquakeresponseintensityandtherelativevalueshowedalogarithmiclinear,themaximumsimilaritymethodwouldbeusedtoobtainβ,λ,andImax,andalsoachievetheresultsofriskanalysisoneachsite.Atthesametime,the"logictree"methodcanbeusedtocalibratetheuncertaintyoftheriskoneachsite.Thenthefinalresultsofriskanalysisindicatethatthismethodisfeasible,particularlyforthesitesshowingintensityanomaly.
简介:Analysisofforeshocksequenceofthe1975HaichengearthquakeofMs7.3Zhao-RongZUO(左兆荣);Jian-PingWU(吴建平)andZhi-LingWU(巫志玲)(Instituteof...
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:Digitaldataofprecursorsisnotedforitshighaccuracy.Therefore,itisimportanttoextractthehighfrequencyinformationfromthelowonesinthedigitaldataofprecursorsandtodiscriminatebetweenthetrendanomaliesandtheshort-termanomalies.Thispaperpresentsamethodtoseparatethehighfrequencyinformationfromthelowonesbyusingthewavelettransformtoanalyzethedigitaldataofprecursors,andillustrateswithexamplesthetrainofthoughtsofdiscriminatingtheshort-termanomaliesfromtrendanomaliesbyusingthewavelettransform,thusprovideaneweffectiveapproachforextractingtheshort-termandtrendanomaliesfromthedigitaldataofprecursors.