简介：基于表演的地震工程是由于它写实地模仿结构的反应特征的能力导致了广泛地发达的设计方法论的研究的一个最近的焦点。地震要求的精确预言是基于表演的设计方法论的一个关键部件。这篇论文与中等韧性论述增强的具体时刻框架的地震需求评估。利用简化非线性的静态的分析的精确性被比较在很多个框架上对时间历史分析的结果估计。排水量侧面，飘移需求和最大的塑料旋转被计算估计地震要求。估计的地震要求与在FEMA356的接受标准相比。结果显示这些框架有足够的能力抵抗比限制价值大的interstory飘移。

简介：AnindexingmethodforrapidevaluationoftheseismicvulnerabilityofinfilledRCframebuildingsinJordanisproposed.Themethodaimsatidentifyinglowandmediumriseresidentialbuildingsassafeorinneedoffurtherdetailedevaluation.Followingarapidvisualscreening,thebuildingisassignedaBasicCapacityIndex(BCI);fiveperformancemodifiersareidentifiedandmultipliedbytheBCItoarriveattheCapacityIndex(CI)ofthebuilding.ACapacityIndexlowerthanalimitCIvalueindicatesthatthescreenedbuildingcouldexperiencemoderateearthquakedamagewhereasahighervalueimpliesthatminordamage,ifany,wouldtakeplace.Toestablishthebasicevaluationparameters;fortyRCframebuildingswereselected,designedandanalyzedusingstaticnonlinearanalysisandincorporatingtheeffectofinfillwalls.Effectsofseismicity,localsiteconditions,horizontalirregularities(setbacksandre-entrantcorners),verticalirregularities(softstoryatgroundfloorlevel)andoverhangsontheseismicperformanceoflocalbuildingswereexamined.Assessmentformsweredesignedandusedtoevaluateandrank112samplebuildings.About40%ofthesurveyedbuildingswerefoundtobeinneedofdetailedevaluationtobetterdefinetheirseismicvulnerabilities.

简介：13earthquakeswithM≥5.0havebeenrecordedinthenortheastregionofChinasince1970,amongwhicheightmedium-strongearthquakesareindependentinspaceandtime.Studiesofseismicitybeforetheseeightmedium-strongearthquakesshowthatsmallearthquakeactivitywasenhancedbeforetheoccurrences.ThoughseismicityincreaseisacommonphenomenoninthenortheastChinaregion,wehavedifficultyinpredictingthemedium-strongearthquakesbythisphenomenonalone.Inordertopredictmedium-strongearthquakesthroughseismicityincrease,thispapertriestoproposeanewmethodthatcalculatessmallearthquakefrequencythroughthechangingpatternofsmallearthquakeactivitiesbasedonthecharacteristicsofsmallearthquakeactivityinthenortheastChinaregion.Theresultsshowthatwecangettheobviousanomalyfrequencyofsmallearthquakesbeforemedium-strongearthquakesthroughthenewmethod,andcanobtainamediumtoshorttermanomalyindexforthenortheastChinaregion.

简介：Anovelhybridapproachforearthquakelocationisproposedwhichusesacombinedcoarseglobalsearchandfinelocalinversionwithaminimumsearchroutine,plusanexaminationoftherootmeansquares(RMS)errordistribution.ThemethodexploitstheadvantagesofnetworkraytracingandrobustformulationoftheFréchetderivativestosimultaneouslyupdateallpossibleinitialsourceparametersaroundmostlocalminima(includingtheglobalminimum)inthesolutionspace,andfinallytodeterminethelikelyglobalsolution.Severalsyntheticexamplesinvolvinga3-Dcomplexvelocitymodelandachallengingsource-receiverlayoutareusedtodemonstratethecapabilityofthenewly-developedmethod.Thisnewglobal-localhybridsolutiontechniquenotonlyincorporatesthesignificantbenefitsofourrecentlypublishedhypocenterdeterminationprocedureformultipleearthquakeparameters,butalsoofferstheattractivefeaturesofglobaloptimalsearchingintheRMStraveltimeerrordistribution.Unlikethetraditionalglobalsearchmethod,forexample,theMonteCarloapproach,wheremillionsoftestshavetobedonetofindthefinalglobalsolution,thenewmethodonlyconductsamatrixinversiontypelocalsearchbutdoesitmultipletimessimultaneouslythroughoutthemodelvolumetoseekaglobalsolution.ThesearchisaidedbyinspectionoftheRMSerrordistribution.Benchmarktestsagainsttwopopularapproaches,thedirectgridsearchmethodandtheoct-treeimportantsamplingmethod,indicatethatthehybridglobal-localinversionyieldscomparablelocationaccuracyandisnotsensitivetomodestlevelofnoisedata,butmoreimportantlyitofferstwo-orderofmagnitudespeed-upincomputationaleffort.Suchanimprovement,combinedwithhighaccuracy,makeitapromisinghypocenterdeterminationschemeinearthquakeearlywarning,tsunamiearlywarning,rapidhazardassessmentandemergencyresponseafterstrongearthquakeoccurrence.

简介：BasedonthesolutionsoftheGreen'sfunctionforasaturatedporousmediumobtainedbytheauthors,andusingtransformationofaxisymmetriccoordinates,Sommerfeldintegralsandsuperpositionoftheinfluencefieldonafreesurface,theauthorshaveobtaineddisplacementsolutionsofasaturatedporousmediumsubjectedtoatorsionalforceinahalf-space.Therelationshipcurvesofthedisplacementsolutionsandvariousparameters(permeability,frequency,etc.)underactionofaunitoftorquearealsogiveninthispaper.TheresultsareconsistentwithpreviousReissner'ssolutions,whereatwo-phasemediumdecaystoasingle-phasemedium.Thesolutionisusefulinsolvingrelevantdynamicproblemsofatwophasesaturatedmediuminengineering.

简介：Amodelofdoublemediumaquiferisbrieflyintroducedinthispaper,apartialdifferentialequationaboutseepagemotionderivedbythetidalstressinthemodellayerisdeduced.ComparedthisequationwithBoultonequationusedintheunconfinedaquifer,anewlaggingsupplywatertermisobtained,whichestablishthephysicalbasisforinterpretingthephasedelayphenomenaofwellwaterlevelcausedbythesolidtide.Byanalyzingthepartialdif-ferentialequation,itisfoundthatthislaggingsupplytermisrelatedwiththefluctuationoftideoccurredinthedeepaquifer.

简介：UsingGPSobservationsofhorizontalmovementfrom2001to2003andthecross-faultmobileshort-levellingdataof1988～2003,andwiththeaidoftheimprovednegativedislocationmodelandthetime-varyingcurveofstrainintensityratiooffaultdeformation,theregionaltectonicdeformationbackgroundandmedium-andshort-termprecursorsrelatedtothepreparationoftheMinle-ShandanearthquakesofMs6.1andMs5.8onOctober25,2003areinvestigated.Theresultsrevealthat,underthebackgroundofthewide-rangedeformationadjustment,short-termrelaxationandrecoverycausedbytheKuulunMountainsearthquakeofMsS.1,thehypocentersoftheearthquakesarelocatedonthenorthedgeoftheshearstressenhancementzonebetweenthecompressionallockedsegmentsofblockboundaryfault,aplacewhichmayrepresentanacceleratedstrainaccumulation.Anobviousanomalyofstrainintensityratioappearedinshort-levellingmeasurementscrossingoverthefaultattheShihuiyaokousite,theclosesttotheepicenters,3monthsbeforetheoccurrenceoftheearthquakes.Inaddition,thevariationinnumberofanomaliesfrom10-odddaystomonthsbeforetheearthquakesintheentiremonitoringareaandtheanomalyconcentrationandlocalenhancementrelativetonearsourceinthe3monthsbeforetheearthquakesareregardedtobeprecursorstothetwoevents.

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。