简介:Becauseofitsexcellentseismicperformance,reinforcedsoilretainingwallsareincreasinglyusedincivilengineering.Althoughmanycountrieshavepublishedcorrespondingdesigncodes,thedifferencesbetweenthemarestillrelativelylarge.UsingtheFHWACodeandtheCodeforSeismicDesignofRailwayEngineering(CSDRE),stabilitycalculationsofreinforcedsoilretainingwallswerecarriedoutandthesimilaritiesanddifferencesbetweenthesetwodesigncodeswereanalyzed.Accordingtothecomparativeanalysis,thefollowingconclusionsaredrawn:theinertiaforce,theearthpressureandthetensileforceofreinforcementscalculatedfromtheCSDREarelessthanthosefromtheFHWACode,andthesafetyfactorcalculatedfromtheformerislarger.AlthoughtheM-Omethodisrecommendedtocalculatethedynamicearthpressure,theFHWACodesuggestsahigheractionpointascomparedtotheCSDRE.
简介:Performance-basedseismicdesign(PBSD)aimstoassessstructuresatdifferentdamagestates.Sincedamagecanbedirectlyassociatedtodisplacements,seismicdesignwithconsiderationofdisplacementseemstobelogical.Inthisstudy,simpleformulaetoestimatethepeakfloordisplacementpatternsofeccentricallybracedframes(EBFs)atdifferentperformancelevelssubjectedtoearthquakegroundmotionsareproposed.TheseformulaeareapplicableinaPBSDandespeciallyindirectdisplacement-baseddesign(DDBD).Parametricstudyisconductedonagroupof30EBFsunderasetof15farfieldandnearfieldaccelerogramswhichtheyscaledtodifferentamplitudestoadaptvariousperformancelevels.TheresultsofthousandsofnonlineardynamicanalysesofEBFshavebeenpost-processedbynonlinearregressionanalysisinordertorecognizethemajorparametersthatinfluencethepeakdisplacementpatternoftheseframes.Resultsshowthatsuggesteddisplacementpatternshaverelativelygoodagreementwiththoseacquiredbyanexactnonlineardynamicanalysis.
简介:Cable-membranestructureshavesmallrigidityandarehighlysensitivetowind.Structuralhealthmonitoringisnecessarytoensuretheserviceabilityandsafetyofthestructure.Inthisresearch,thedesignmethodofastructuralhealthmonitoringsystemisusingthecharacteristicsofacable-membranestructure.TakingtheYueyangSanheAirportTerminalasanexample,afiniteelementmodelisestablishedtodeterminethecriticalstructuralcomponents.Next,theengineeringrequirementsandtheframeworkofthemonitoringsystemarestudiedbasedontheresultsofnumericalanalysis.Thespecificimplementationofthestructuralhealthmonitoringisthencarriedout,whichincludessensorselection,installationandwiring.TheproposedframeworkissuccessfullyappliedtothemonitoringsystemfortheYueyangAirportterminalbuilding,andthesynchronousacquisitionoffiberBragggratingandaccelerationsensorsignalsisimplementedinaninnovativeway.Thesuccessfulimplementationandoperationofstructuralhealthmonitoringwillhelptoguaranteethesafetyofthecablemembranestructureduringitsservicelife.