Performance-based multiobjective optimum design of steel structures considering life-cycle cost

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1、StructMultidiscOptim(2006)32:1–11DOI10.1007/s00158-006-0009-yRESEARCHPAPERMichalisFragiadakis·NikosD.Lagaros·ManolisPapadrakakisPerformance-basedmultiobjectiveoptimumdesignofsteelstructuresconsideringlife-cyclecostReceived:18May2005/Revisedmanuscriptreceived:7October2005/Publishedonline:2

2、7April2006©Springer-Verlag2006AbstractAnewmethodologyfortheperformance-basedwasintroduced.Theprogressthattookplaceinthelasttwooptimumdesignofsteelstructuressubjectedtoseismicload-decadesinthefieldsofcomputationalmechanicsandhard-ingconsideringinelasticbehaviorisproposed.Theimpor-waretechno

3、logymadepossibletoemploymorerealistictanceofconsideringlife-cyclecostasanadditionalobjectivedesignproceduresbasedonnonlinearanalysisinplaceoftotheinitialstructuralcostobjectivefunctioninthecontextproceduresbasedonlinearanalysis.Theuseofstructuralofmultiobjectiveoptimizationisalsoinvestiga

4、ted.Life-cycleoptimizationmethodsprovidesthecomputationalenviron-costisconsideredtotakeintoaccountduringthedesignphasementtoreplacethetraditional“trialanderror”processwiththeimpactoffutureearthquakes.Forthesolutionofthemul-anautomaticprocedure.Therefore,moreelaborate,nonlineartiobjectiveo

5、ptimizationproblem,EvolutionaryAlgorithmsanalysismethodscanbeeasilyintroducedforthedesignofandinparticularanalgorithmbasedonEvolutionStrategies,newstructureswhenastructuraloptimizationenvironmentspecificallytailoredtomeetthecharacteristicsoftheproblemispresent,asopposedtothecurrentpractice

6、wheretheseathand,areimplemented.Theconstraintsoftheoptimiza-methodsareusedprimarilyfortheassessmentofexistingtionproblemarebasedontheprovisionsofEuropeandesignstructures.codes,whileadditionalconstraintsareimposedbymeansofPerformance-baseddesignconceptshavebeenintro-pushoveranalysistocontr

7、oltheloadanddeformationcapac-ducedoverthelast10yearsbyvariousguidelines[ATC-40ityofthestructure.(1996);FEMA-356(2000);SEAOCVision2000(1995)]fortheassessmentandrehabilitationofexistingstructuresandtheanalysisanddesignofnewones.ThemainobjectiveisKeywordsStructuralopti