Resilience and Sustainability of the Civil Infrastructure Towards a Unified Approach.docx
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Resilience and Sustainability of the Civil Infrastructure Towards a Unified Approach.docx
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ResilienceandSustainabilityoftheCivilInfrastructureTowardsaUnifiedApproach
ResilienceandSustainabilityoftheCivilInfrastructure:
TowardsaUnifiedApproach
PaoloBocchini∗,M.ASCEDanM.Frangopol†,Dist.M.ASCE
ThomasUmmenhofer‡TimZinke
Abstract
Inrecentyearstheconceptsofresilienceandsustainabilitybecameverytopicalandpopular.Theconceptofsustainabilityroseinthelate1980sandbecameacentralissueinworldpolitics,whentheconstructionindustrybegantogeneratethefirstsustainablebuildingassessmentsystemswithmoreorlessequallyweightedenvironmental,economic,andsocialaspectsforofficebuildingsovertheirlife-cycle.Ontheotherhand,resilienceisusuallyconnectedwiththeoccurrenceofextremeeventsduringthelifecycleofstructuresandinfrastructures.Inthelastdecadeithasbeenusedtominimizespecificallydirectandindirectlossesincaseofhazards,throughenhancedresistanceandrobustnesstoextremeevents,andmoreeffectiverecoverystrategies.Adetailedcomparisonofthestudiesdealingwitheitherinfrastructuresustainabilityorresiliencepresentedinthispaperleadstotheconclusionthattheyhaveavastnumberofsimilaritiesandcommoncharacteristics.Forinstance,theybothcombinestructuralanalyseswithsocialandeconomicaspects;theybothrelyontechniquesforthelife-cycleanalysisanddecisionmaking;theybothareinanearlystagewheretheacademicworldistryingtofindthebestwaytopromotetheapplicationofthescientificresultsamongprofessionalengineersandtheindustry.Indeed,bothapproachestrytooptimizeasystem,suchasacivilinfrastructuresystem,withrespecttostructuraldesign,utilizedmaterial,maintenanceplans,managementstrategies,andimpactsonthesociety.However,forthemostpart,researchersandpractitionersfocusingoneitherresilienceorsustainabilityoperatewithoutamutualconsiderationofthefindings,whichleadstoasevereinefficiency.Therefore,thispapersuggeststhatresilienceandsustainabilityarecomplementaryandshouldbeusedinanintegratedperspective.Inparticular,theproposedapproachisrootedinthewell-establishedframeworkofriskassessment.Theimpactoftheinfrastructureanditsservicestatesonthesocietyinnormaloperationalconditions(assessedbysustainabilityanalysis)andafterexceptionalevents(assessedbyresilienceanalysis)shouldbeweightedbytheassociatedprobabilitiesofoccurrenceandcombinedinaglobalimpactassessment.Theproposedperspectiveandassessmenttechniqueisapplicabletovarioustypesofcivilinfrastructuresystems,butthecaseoftransportationnetworksandbridgesystemsisemphasizedherein.Anumericalapplicationdealingwiththecomparativeanalysisoftwopossiblebridgelayoutsispresentedtoexemplifytheapproach.Theresultsshowthatbothresilienceandsustainabilityanalysesassessarelevantamountoftheimpactofthebridgeonthecommunitywhereitisbuilt,thusneitheronecanbeneglected.
Keywords:
Resilience,Sustainability,Life-Cycle,Assessment,Risk,Infrastructure,Bridges,TransportationNetworks.
Introduction
Thewords“resilience”and“sustainability”arecurrentlydominatingthesceneofresearchtrendsandpracticalinterestsinthefieldofcivilinfrastructure.Fromthedescriptionsoftheopeningfacultypositionsinthetopuniversitiestothetitlesofthemostattendedscientificsymposia;fromthetopicsofthenewresearchprojectssponsoredbysciencefoundationsaroundtheworldtothemostrecentrequirementsoflocaladministrationsfornewconstructions,“resilience”and“sustainability”arekeywordsthattogetherseemtocovermorethan50%ofthecases.Nevertheless,tothebestoftheauthors’knowledge,thereareveryfewinvestigationsonhowtocombineresilienceandsustainabilityinanunifiedmethodologyfordesign,assessment,andmaintenancemanagementofcivilinfrastructuresystems.
Asevereinefficiencycanbeidentifiedbecausethetheoreticalandpracticaldevelopmentofresilienceandsustainabilityhastakenplaceseparatelyandforthemostpartwithoutamutualconsiderationofthefindings.Themaincauseofthisissuecanprobablybefoundinthedifferenthistoricalorigins.Thispaperpresentsanefforttodevelopaunifiedperspectiveforbothresilienceandsustainability.
Resilienceisametricthatmeasurestheabilityofasystemtowithstandanunusualperturbation,andtorecoverefficientlyfromthedamageinducedbysuchperturbation.Inthecaseofcivilinfrastructure,resilienceisusuallyassociatedwiththeabilitytodeliveracertainservicelevelevenaftertheoccurrenceofanextremeevent,suchasanearthquake,andtorecoverthedesiredfunctionalityasfastaspossible.
Sustainabilityisamodelwhichaddressessimultaneouslytoday’sneedsandtheimpactsonfuturegenerations.Itischaracterizedbyaholisticviewandbringstogetherthreedimensions:
ecology,economyandsociety.Withinthepast25yearsithasbecomeimportantforpoliticalstrategies,forgoalsofnations,cities,andcommunitiesaswellasforbusinessstrategyofcompanies.Along-termsustainabledevelopmentcanonlybeachievediftheideaofsustainabilityisimplementedatdifferentlevels,fromnationalguidelinestothepracticalapplicationonsite.Thedifferentlevelsshouldexchangeinformationandknowledgetoguaranteeanefficientadvancement.
Theoriginalcontributionofthispaperconsistsinaunifiedapproachthatusestheconceptsofprobabilityofoccurrenceandriskinordertoaddresssimultaneouslyandquantitativelyresilienceandsustainabilityofthecivilinfrastructure.
Thefirstpartofthispaperprovidesahistoricalintroductiontobothsustainabilityandresilience,forthebenefitofthosereaderswhomightbeunfamiliarwithatleastoneofthetwoconcepts.Secondly,similaritiesanddifferencesareanalyzedconsideringtheprobabilityofoccurrenceduringthelife-cycle.Afterwards,issuessuchasintegrationofresilienceandsustainabilityforinfrastructures,mid-termstrategies,andlong-termnecessitiesareaddressed.Next,theassessmentoftheimpactonresilienceandsustainabilityofsomepracticaldesigndecisionsisexemplified.Finally,themostrelevantconclusionsaredrawn.
Historyofdiscussioninthefieldofsustainability
Sustainabilityhasrunthroughanintensivelydiscussedprocessofdevelopmentduringthepasttwentyyears.Asaresultabroadarrayofdifferentapproachesandperspectivesexist.Dependingonthefieldofapplication(sustainability-policiesofcountries,sustainability-reportsofcompanies,sustainability-indicesofstockmarkets)theterm“sustainability”isuseddifferentlyandtheindicatorsusedforitsdescriptionaremanifold.Onthebasisofpoliticaldecisionsandstrategies,theimplementationofsustainabledevelopmenthastobeperformedbypracticalactions.Overall,bothpoliticaldecisionsandpracticalimplementationsareimportanttopromotesustainabledevelopment.Tocreateabasicunderstandingofsustainabilityandtoprovideacommonbasisforfurtherdiscussions,abriefoverviewofthehistoryofsustainabilityisprovided.
Macro-leveldevelopmentdrivenbyworldpolitics
Theoriginsofcontentsdiscussedinconnectionwiththeterm“sustainability”gobacktothebeginningofthe20thCenturyandarerootedinthehistoricdevelopmentofenvironmentalism(Pepper2005).Duringthe1970sand1980s,problemscausedbyenvironmentalpollutionandconsumptionofresourcesbecameincreasinglyimportant.Themostsignificantreportofthattimedealingwiththistopicis“LimitstoGrowth”,publishedbytheClubofRome(Meadowsetal.1972).Thisreportanalyzesthegrowthofworldpopulationandtheresultingconsumptionofresourcesoverthefollowing100years.Theresultspredictafailureoftheworldeconomyincasetheeconomicsystemandthetreatmentoftheenvironmentwerenotchanged.
TheBrundtlandReport“OurCommonFuture”canbeidentifiedasamilestone(Brundtland1987).Itdealswiththerelationshipbetweendevelopmentandenvironmentalpoliciesanddefinesthemodelofsustainabledevelopmentforthefirsttime:
“Sustainabledevelopmentisdevelopmentthatmeetstheneedsofthepresentwithoutcompromisingtheabilityoffuturegenerationstomeettheirownneeds”(Brundtland1987).ThisreportprovidedtheimpetusfortheconventionofthefirstUnitedNationsConferenceonEnvironmentandDevelopment,alsoknownas“EarthSummit”(RiodeJaneiro,1992).ThemostimportantresulthasbeentheadoptionoftheAgenda21whichisanactionprogramcontainingspecifications,interalia,tofightagainstpoverty,energypolicyaswellasfinancialandtechnologicalcooperationofindustrializedanddevelopingcountries(UNCED1993).Inaddition,theresultshavebeenextendedandstrengthenedduringJohannesburgSummitin2002(UN2002).ForthefirsttimethetranscriptionintospecificpolicygoalshasbeenrealizedattheUnitedNationsFrameworkConventiononClimateChangeinKyotoin1997(UN1998)bydeterminingobligatorytargetsforthelimitationofenvironmentalimpacts,suchasthereductionofCO2emissions.
Onthebasisoftheconventionsandreportsmentionedabove,abroaddiscussiondealingwithsustainabilityandsustainabledevelopmenttookplace.Asaresult,anunderstandingofthreedifferentdimensionsorpillarswasdevelopedwhichspecifiedtheconceptualmodelofsustainability.Thethreedimensionsofsustainability—economic,ecologic,andsocial—areinternationallyacceptedasawell-establishedframeworkthesedays(Otto2007).Severalothercategoriesfororganizingsustainabilityindicatorsandcriteria(suchastechnicalaspects,impactsonlandandwater,hea
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