简介：Thispaperpresentsin-situseismicperformancetestsofabridgebeforeitsdemolitionduetoaccumulatedscouringproblem.Thetestswereconductedonthreesinglecolumnsandonecaisson-typefoundation.Thethreesinglecolumnswere1.8mindiameter,reinforcedby30-D32longitudinalreinforcementsandlaterallyhoopedbyD16reinforcementswithspacingof20cm.Thecolumnheightis9.54m,10.59mand10.37mforColumnP2,P3,andP4,respectively.ColumnP2hadnoexposedfoundationandwassubjectedtopseudo-dynamictestswithpeakgroundaccelerationof0.32gfirst,followedbyonecyclicloadingtest.ColumnP3wasthebenchmarkspecimenwithexposedlengthof1.2monitsfoundation.TheexposedlengthforColumnP4wasexcavatedto4m,approximately1/3ofthefoundationlength,tostudytheeffectofthescouringproblemtothecolumnperformance.BothColumnP3andColumnP4weresubjectedtocyclicloadingtests.Basedonthetestresults,duetothelargedimensionofthecaissonfoundationandthewellgradedgravelsoiltypethatprovidedlargelateralresistance,theseismicperformanceamongthethreecolumnshadonlyminordifferences.LateralpushtestswerealsoconductedonthecaissonfoundationatColumnP5.Thecaissonwas12mlongandhadcircularcross-sectionswhosediameterswere5mintheupperportionand4minthelowerportion.AnanalyticalmodeltosimulatethetestresultswasdevelopedintheOpenSeesplatform.Theanalyticalmodelcomprisednonlinearflexuralelementsaswellasnonlinearsoilsprings.Theanalyticalresultscloselyfollowedtheexperimentaltestresults.Aparametricstudytopredictthebehaviorofthebridgecolumnwithdifferentgroundmotionsanddifferentlevelsofscouringonthefoundationarealsodiscussed.

简介：意外怪癖是为高大楼的地震设计的一个非标准的假设。考虑它要求地震抵抗的分析，它要求怪癖的结构的自然颤动的也耗时的计算或由为各怪癖的大小写使用一接近的相等的扭力的时刻发现一个静态的排水量答案。这研究建议一条其他的形式的反应光谱分析(MRSA)途径与意外怪癖计算地震回答。建议途径，把瑞利夸耀称为Projection-MRSA(RRP-MRSA)，基于MRSA和二策略被开发：获得怪人的近似模式的快计算的一个RRP方法组织的(a)；并且(b)装配怪人的集体矩阵的一条途径组织。RRP-MRSA的效率经由设计例子并且与标准MRSA(ST-MRSA)和一个近似方法相比被测试，即，相等的扭力的时刻混血儿MRSA(ETM-MRSA)。数字结果显示出那RRP-MRSA不仅几乎完成象ST-MRSA的一样的精确，并且比ETM-MRSA好一些，但是也是更节俭的。因此，RRP-MRSA能代替在地震设计的当前的意外怪癖计算。

简介：这研究的目的是在岩石地点在50年里为exceedance的2%和10%概率包括鈥楶eak地面加速鈥?价值为Yangon和它的包围区域开发概率的地震危险地图。现在的学习区域在N13掳3的纬度之间是位于的7鈥?和N20掳2鈥?和E93掳3的经度5鈥?和E99掳5鈥吗？学习区域集中于与大约200km的半径在Yangon附近集中的九个来源地区。概率的地震危险地图被ArcGIS-9.3软件创造。

简介：TheseismotectonicenvironmentandseismicactivityinSouthwestChinaregionwerestudiedbasedonnewdataandnewresultsobtainedduringtheEighthandNinthFive-YearPlans,theseismicareasandzonesandpotentialseismicsourcezonesweredetermined.andtherelationbetweenseismicactivityparametersandgroundmotionattenuationwasdetermined.FinallytheseismicgoundmotionzoningmapsofthePangxiregionwascompiledbyusingthemulti-parameterandmulti-schememethod.

简介：TheprimarygoalofthedemonstrationprojectendorsedbytheScientificandTechnicalCommitteeforIDNDRin1992istoensurethatnationalagenciesareabletoassessseismichazardinaregionallycoordinatedfashionbyusingadvancedmethods.China,asaRegionalCenterofCentralSouthernAsia,hascontactedwithcountriesoftheregiontorealisticallypracticeseismichazardassessmentsofContinentalAsia.AtestarealocatedinthecollisionboundarybetweentheIndianandEurasianplateswaschosentoexaminetheseismichazardassessmentapproachintheregionalcoordinates.TheseismotectonicsandthreeversionsofseismicsourcesofthetestareaaredescribedinthispaperandundertheGlobalSeismicHazardAssessmentProgram(GSHAP),guidelinesanearthquakecatalogueofthetestareawasassembled.Becauseoftheincompletenessofearthquakedataindifferentcountries,weadoptdifferenttimewindowsfordifferentmagnitudeintervalsinordertoobtaintheseismicityparametersofsources.Byu

简介：许多高速公路桥严重地在2008Wenchuan地震期间被损坏或完全崩溃了。领域调查在强烈影响的区域被执行，超过320座桥被检验。一些代表性的高速公路桥的损坏简短被描述，损坏的可能的原因的初步的分析在这篇论文被介绍。最普通的损坏包括了墩列的砍曲折的失败，扩大关节失败，砍关键失败，并且girder由于在girder和轴承之间的弱连接在横过或纵的方向滑动。从这地震接受的教训被描述并且与弄弯并且扭曲的桥的设计有关的建议，轴承和设备的设计被介绍阻止桥墩的girder倒塌，和韧性。为未来的建议为桥在的地震设计和翻新的技术对严重地震区域中等也被建议。

简介：地震当(SWD)钻是新兴的地上凿穿时把downhole练习小点颤动用作地震的地震成像技术采购原料。没有打断钻，SWD技术能在小点前做岩石形成的在即时附近的图象并且优化钻操作，与费用的减小和钻的风险。然而，到表面SWD数据的噪音比率(SNR)的信号为SWD数据的表面获得是严重地低的。这里，我们建议一个新方法从一连串的宽带测震表记录的表面数据检索练习小点信号。利用wavefield分析，噪音的不同类型被识别并且从表面SWD数据搬迁了，导致SNR的重要改进。我们最佳地也综合位来源的地震反应，用统计跨连贯的分析指导然后被用来证实一个反向的垂直地震侧面(RVSP)数据为连续的钻深度设定的到达和思考进一步改进SNR并且两个都检索练习小点。从这些数据导出的表面下的图象与三尺寸的表面的相应图象作比较很好地震调查十字很好。

简介：Thenoisedatainverticalcomponentrecordsof85seismicstationsinFujianProvinceduring2012isusedastheresearchobjectinthispaper.Thenoisedataisdividedintofiveminutesegmentstocalculatethepowerspectra.Thehighreferencelineandlowreferencelineofstationarethenidentifiedbydrawingaprobabilitydensityfunctiongraph(PDF)usingthepowerspectralprobabilitydensityfunction.Moreover,accordingtotheanomaliesofPDFgraphsin85seismicstations,theabnormalnoiseisdividedintofourcategories:droppedpacket,lownoise,highnoise,andmediannoiseanomalies.Afterwards,fourselectionmethodsarefoundbythehighorlownoisereferencelineofthestations,andthesystemofreal-timemonitoringofseismicnoiseisformedbycombiningthefourselectionmethods.Noiserecordsof85seismicstationsinFujianProvinceinJuly2013areselectedforverification,andtheresultsshowthattheanomalousnoise-recognitionsystemcouldreacha90%successrateatmoststationsandtheeffectofselectionareverygood.Therefore,itcouldbeappliedtotheseismicnoisereal-timemonitoringinstations.

简介：钢的地震行为增强了高力量，高效水泥(SRHC)框架列通过16框架列的伪静电干扰实验被调查与各种各样砍跨度比率，轴的压缩比率，具体力量，钢比率和马镫比率。三种失败机制被介绍，有不同设计参数的试验性的hysteretic曲线和骨骼曲线的特征被讨论。列韧性和精力驱散是基于地震抵抗评估的份量上。研究结果显示SRHC框架列能承受韧性的极端适用的能力，而是能力，因为SRHC自然易碎物，精力驱散是劣等的。作为结果，轴的负担比率应该被限制，一些构造措施采用了，例如增加马镫比率。这研究在SPHC列的适用的能力上建立了效果因素。最后，为用曲折失败模式获得最终的适用的能力的一个算法基于一个修改飞机节假设被建立。作者也证实决定砍的baroclinic失败并且砍的方程结合失败基于轴的负担力量分发比率的累积。计算结果砍忍受能力因为不同失败模式在对试验性的结果的好同意。

简介：Thispaperquantitativelyanalyzedgroundwatertablefluctuationscausedbygroundwateroverdraft,andprobedintothepossibilityofdrawingearthquakeprecursoryinformationfromgroundwatertablevariationsonthebackgroundofgroundwateroverdraft.MaineffectfactorsofgroundwaterregimeinBeijingregionincludegroundwaterextractionandrainfall.Thedeclineofgroundwatertablewasdirectlyrelatedtoregionalgroundwateroverdraft.Usingthemethodofcorrelationanalysis,thepaperanalyzedtherelationbetweengroundwateroverdraftandgroundwaterlevelvariations,withtheaimofevaluatingtheeffectofgroundwateroverdraftonwaterlevelsinobservationwellsandprovidingscientificbasisforidentifyingseismicprecursoryinformation.Theresultsindicatethatthevariationsofgroundwaterlevelinslightly-affectedzonesofgroundwateroverdraftcancontainsomeseismicprecursoryinformation,anditispossibletoextractseismicprecursoryanomaliesifpropermathematicalmethodsareadoptedtoremovethetrendcomponentandannualperiodchanges.

简介：一个沉积地质的模型被建立以便学习隧道沙身体的地震思考特征。合成地震射击集合用声学的波浪方程被模仿然后prestack时间被移植。在想象的数据上，思考特征和即时属性被分析，抑制木头的阻抗倒置被测试。因为波浪领域干扰，试验性的结果证明地震事件毫无疑问不对应于隧道沙身体并且出现的地震模式不代表实际的。波浪干扰形成的地震事件可以在沙身体解释导致错误和陷井。在即时地震属性和沉积的沙之间的相应关系很好没被建立。抑制木头的阻抗倒置改进隧道沙的决定。然而，如果转换分辨率被强迫太高，与起始的模型有关的人工制品可以发生。

简介：Steel-concretecompositestructuresthatsharetheadvantagesofbothsteelstructureandconcretestructurehavebeendevelopedrapidlyandusedwidely.Ithasbeenapopularstructureinhigh-risebuildingsinrecentyears.Althoughmoreandmorecompositestructureshavebeenusedinearthquakearea,onlyafewliteraturesaboutfragilityanalysisofthistypeofstructureareavailable.Inthispaper,afragilityanalysismethodbasedonperformanceisproposed,inwhichboththeuncertaintyduetovariabilityinstructuresandgroundmotionareconsidered.Seismicfragilityanalysisisperformedfora15-storycompositebeam-concrete-filledsquaresteeltubecolumnframebytheproposedmethod.Thetop-drift-angleandthestory-drift-angleareusedasquantitativeindexestodefinethefourdifferentperformancelevels.Thenseismicdemandprobabilityanalysisiscarriedoutandfragilitycurvesarederivedtoassesstheseismicperformanceofthistypeofstructure.

简介：Intheestimationofseismictendency,usingGutenberg-Richter￠sb-valueandusingHurstexponentaretwocom-monlyusedmethods.Basedonthefractalgeometryofearthquaketimeseries,wepointoutthatthesetwomethodscorrelatetoeachother.IntheperspectiveoffractionalBrownianmotion(FBM),anearthquakesequencewithb>3/4andthatwithb<3/4havedifferentdynamicproperties.

简介：Thispaperintroducesthecomponentsandfunctionsofsoftwareofseismicreservoirinversionsandhydrocarbondetection.

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

简介：

简介：Basedonthesitehistoricalearthquakedata,amethodofseismicriskanalysisispresented.Oncethefrequencyofearthquakeresponseintensityandtherelativevalueshowedalogarithmiclinear,themaximumsimilaritymethodwouldbeusedtoobtainβ,λ,andImax,andalsoachievetheresultsofriskanalysisoneachsite.Atthesametime,the"logictree"methodcanbeusedtocalibratetheuncertaintyoftheriskoneachsite.Thenthefinalresultsofriskanalysisindicatethatthismethodisfeasible,particularlyforthesitesshowingintensityanomaly.

简介：Aseismicstabilityassessmentofarchdam-foundationsystemsispresentedusingacomprehensiveapproach,inwhichthemainfactorsthatsignificantlyinfluencetheseismicresponseofanarchdam-foundationsystemareconsidered.Alargescalefiniteelementmodelwithover1milliondegreesoffreedomisconstructedfortheBaihetanarchdam(289mhigh),whichisunderconstructionintheSouthwestofChina.Inparticular,thecomplicatedgeologicalconditionswithfaultsintersectinginterlayershearweaknesszonesatthedambaseandthedamabutmentresistingforcebodyismodeledintheanalysis.Threeperformanceindicesareadoptedtoassesstheseismicstabilityofthearchdam.TheresultsdemonstratethattheopeningofthejointsoftheBaihetanarchdamissmallandthewaterstopinstalledbetweenthejointswouldnotbetornduringadesignearthquake.Theyieldingformedintheinterfacebetweenthedamandfoundationdoesnotreachthegroutingcurtainthatwouldremaininanelasticstateafteranearthquake.Theyieldingzonesoccurringontheupperportionofthedamfacesextend1/8thicknessofblocksectionintothedambodyandthuscantileverblocksneednotbeconcernedwithslidingstability.Thefaultsandinterlayershearweaknesszonesinthenearfieldfoundationexhibitsevereyielding,andapotentialslidingsurfaceispenetrated.Althoughthefactorofsafetyagainstslidingofthesurfacefluctuateswithadecreasedtrendduringanearthquake,theminimuminstantaneousvaluereaches1.02andisstilllargerthan1.0.Therefore,aconclusionisdrawnthattheBaihetanarchdam-foundationsystemwillremainstableunderthedesignearthquake.

简介：Seismicsafetyassessmentofgravitydamshasbecomeamajorconcerninmanyregionsoftheworldwhiletheeffectsofverticalseismicaccelerationsontheresponseofstructuresremainpoorlyunderstood.Thispaperfirstinvestigatestheeffectofincludingverticalaccelerationsintheslidingresponseanalysisofgravitydamssubjectedtoarangeofhistoricalgroundmotionrecordsseparatedintwogroupsaccordingtotheirsource-to-sitedistance.Analysesshowedthattheincidenceofverticalaccelerationsontheslidingresponseofgravitydamsissignificantlyhigherfornear-sourcerecordsthanforfarsourcerecords.Thepseudo-static30%loadcombinationrule,commonlyusedinpracticetoaccountforthenon-simultaneousoccurrenceofthepeakhorizontalandverticalaccelerations,yieldedgoodapproximationsoftheminimumsafetyfactorsagainstslidingcomputedfromtime-historyanalyses.Amethodforempiricallyestimatingtheverticalresponsespectrabasedonhorizontalspectra,accountingforthedifferenceinfrequencycontentandamplitudesbetweenthetwocomponentsisinvestigated.Resultsfromanalysesusingspectrumcompatiblehorizontalandverticalsyntheticrecordsalsoapproximatedwelltheslidingresponseofagravitydamsubjectedtoseriesofsimultaneoushorizontalandverticalhistoricalearthquakerecords.

简介：有在兴趣的一个区域的类似的特征的不同seismo构造的事件的鉴定和分类是在地震危险研究的最重要的题目之一。在这研究，线性、非线性的判别式分析被使用了在伊斯坦布尔的附近分类地震事件。数字速度震动图的垂直部件与发生在2001和2004之间的在1.8和3.0之间的大小(Md)被用于地震事件。二，时间依赖者参数，复杂性和S/P山峰振幅比率作为predictands被选择。线性，二次，diaglinear和diagquadratic判别式功能被调查。方法与的精确性一另外的调整二次的模型是96.6%，96.6%，95.5%，96.6%，和97.6%，分别地与为每个班的各种各样的分类的率。模型的表演与生气确认和替换错误被认为正当。尽管所有模型很好显著地表演了，调整二次的功能从179与就4个分类事件完成了最好的成功率，与复杂方法例如相比甚至更好，自我组织方法，k工具，在文学适用于一样的数据集的Gaussion混合模型。