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中国石油大学(华东)本科毕业设计(论文)1Developmentandanalysisofthelarge-spanFRPwovenwebstructureABSTRACT:Aninnovativelarge-spanstructuralsystem,namelytheFRPwovenwebstructure(FRPWWS),isintroducedinthispaper.InanFRPWWS,thehigh-strengthFRPstripsare“woven”likebamboostripsinaChinesebamboomattoformaplaneweb.Theouteredgeofthewebisanchoredonanouterringbeam,andaninnerringbeamisprovidedtoanchortheFRPstripsatthecenteroftheweb.Thestiffnessofthewebtoresistvariousloadsisderivedfromtheinitialprestressingduringthe“weaving”stageandtheadditionaltensioningasaresultoftheout-of-planemovementoftheinnerringbeam.Asaresultofthehighstrength-toweightratioofFRP,thisnewstructuralformoffersanattractiveoptionfortheconstructionofspatialstructureswithspanslongerthanarepossiblewithconventionalstructuralmaterials.Inthispaper,thebasiclayoutandconstructionprocedureforasimpleFRPWWSisfirstpresented.Threebasicweavingpatternsarenextexplained.Severalvariationsofthebasicstructuralsystemarealsoproposed.AsimplemechanicalmodelispresentedforthedeformationofindividualFRPstrips.Resultsfromafiniteelementanalysisofanexamplestructurearealsogiven.TheresultsoftheseanalysesconfirmthefeasibilityoftheFRPWWS.1INTRODUCTIONFRPisanewkindofstructuralmaterial,whoseuseincivilengineeringhasbeenactivelyexploredinrecentyears.Duetoitsfavorablepropertieslike中国石油大学(华东)本科毕业设计(论文)2corrosionresistance,highstrength,lowweight,goodfatigueperformance,andlowmaintenancecost,itisconsideredtobeanidealmaterialforconstructinglong-spanstructuresinthenewcentury.However,itsmechanicalpropertiesaredistinctlydifferentfromthoseoftraditionalstructuralmaterialsinsomeaspects,suchasitsanisotropy.DuetotheuniquepropertiesofFRP,itisnecessarytoexplorenewformsoflarge-spanstructuresforitsefficientuseandforachievingspanslargerthanarepossiblewithtraditionalmaterials.Forexample,Maedaetal.(2002)haveconceiveda5000meter-spansuspensionbridgeusingFRP.TheFRPwovenwebstructure,anewlarge-spanstructuralsystem,ispresentedinthispaper.ThisnewsystemrepresentsanattemptaimedattheefficientutilizationoftheuniquecharacteristicsofFRPinalarge-spanroof.InanFRPWWS,thehighstrengthFRPstripsarewovenlikebamboostripsinaChinesebamboomattoformaplaneweb.Theouteredgeofthewebisanchoredonanouterringbeam,andaninnerringbeamisprovidedtoanchortheFRPstripsatthecenteroftheweb.Asmall-scalemodelofasimpleFRPWWSisshowninFigure1.TheFRPstripsareinitiallyprestressedtoalimitedextenttokeepthemstraightduring“weaving”.Then,theFRPwebistensionedbyadisplacementoftheinnerringbeamintheout-ofplanedirection,whichiseffectedeitherbyasetofprestressedtendonsorbysuspendingaheavymassfromtheinnerringbeam.Asaresult,atensionedFRPweb,whosegeometricstiffnessisabletoresistavarietyofloads,formsalarge-spanroofsystemwiththetworings.TheFRPWWSresemblesthecablenetstructureandthecable-membranestructure:theirmembersareflexible;andthegeometricstiffnessresultingfrom中国石油大学(华东)本科毕业设计(论文)3tensionisutilizedtoresistloads.However,theFRPWWShasitsuniqueadvantages:(1)theFRPstripsareidealforsuperlarge-spanstructuresduetotheirlowself-weightandtheirsuperiormaterialpropertiesinthelengthwisedirection,whichareefficientlyutilized,whiletheweaknessofinferiorpropertiesinthetransversedirectionsisnotexposed;(2)significantdampingcanbeexpectedtoarisefromfrictionatjointsbetweenFRPstrips,whichcanenhancetheresistanceofthestructuretowindandearthquakeloads;(3)theregularweavingpatternleadstoanaestheticallypleasingsurface;and(4)thecorrosionresistanceofFRPandtheeaseofinstallationbecauseofitslightweighttranslateintolowmaintenancecosts.Inthispaper,thebasiclayoutandconstructionprocedureforasimpleFRPWWSsystemispresentedindetail.Theweavingpatternsinplanearesummarizedintothreetypes.SomespatialFRPWWSformsforpracticalapplicationsarealsoproposed.AsimplemechanicalmodelforindividualFRPstripsinthewebispresented.ResultsfromthefiniteelementanalysisofasimpleFRPWWSarealsodescribed.2LAYOUTOFASIMPLEFRPWWSAsimpleFRPwovenwebstructureiscomposedofaFRPwovenweb,anouterringbeamandaninnerringbeamforanchorage,andanadditionalweightorasetofprestressedtendons,asshowninFigure1.ThewebiswovenwithFRPstrips,andCFRPstripsorotherhigh-performancehybridFRPstripsaresuggested.CFRPstrips,whichhave中国石油大学(华东)本科毕业设计(论文)4beenwidelyusedtostrengthenconcretestructuresinrecentyears,aremanufacturedbypultrusioningeneral,withafibervolumeratioofabout65%.ThepropertiesoftworepresentativeproductsmadeinChinaandSwitzerlandrespectivelyarelistedinTable1.Thestripscanbecurvedandcircumvolutedduetotheirsmallthickness.AtypicalCFRPstripwithpropertiessimilartothoseshowninTable1isabletoresistatensileforceof400kNormore,whiletheweightofa300mlongstripislessthan70kg.Incomparison,theselfweightofa300mlonghighstrengthsteelcablewhichcanresistthesameloadismorethan500kg.Thestripsarearrangedintoaplanesurfaceofasuitablepatternbysomepre-definedrules.Inthesimplestweavingpattern,eachstrippassesoveronecrossingstripandunderthenexttoformaweblikeawovenfabric.ApartofsuchwebisshowninFigure2(Pongetal.2004).Inamoregeneralcase,thenumberofstripsmeetingatajointandtheanglesbetweenthesestripsarethebasicparametersofaweavingpattern:twostripsat90toeachotherareshowninFig.3(a),threestripsat60showninFig.3(b),andfourstripsat45showninFig.3(c).Atthejoints,stripscanbefullyinter-connectedbyadhesivebondingafterc

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