Life-cycle cost optimization of steel structures

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1、INTERNATIONALJOURNALFORNUMERICALMETHODSINENGINEERINGInt.J.Numer.Meth.Engng2002;55:1451–1462(DOI:10.1002/nme.549)Life-cyclecostoptimizationofsteelstructuresKamalC.Sarma1;2andHojjatAdeli2;∗;†1QwestCommunicationsInternationalInc.;Dublin;OH43016;U.S.A.2Depar

2、tmentofCivilandEnvironmentalEngineeringandGeodeticScience;TheOhioStateUniversity;470HitchcockHall;2070NeilAvenue;Columbus;OH43210;U.S.A.SUMMARYThisarticleaddressesthelife-cyclecostoptimizationofsteelstructures.Themainfactorsin
uencingthelife-cyclecostofa

3、structurearedelineatedandtheireectsonvariouscostfunctionsarediscussed.Afour-criteriaoptimizationmodelispresentedforthelife-cyclecostoptimizationofsteelstructures.Thesecriteriaare(i)selectdiscretecommerciallyavailablesectionswiththelowestcost,(ii)selectc

4、ommerciallyavailablesectionswiththelightestweight,(iii)selecttheminimumnumberofdierenttypesofcommerciallyavailablesections,and(iv)selectcommerciallyavailablesectionswiththemin-imumtotalperimeterlength.Thelastcriterionmodelsarepresentativetypeofcostincur

5、redoverthelifeofthestructure,thatis,preventativemaintenanceintheformofperiodicpaintingofanexposedsteelstructuretoavoidcorrosion.Thelife-cyclecostoptimizationmodelisbasedonfuzzylogicwiththegoalofformalizingthelife-cycledesignprocessbutwithsomeinputfromthe

6、designengineerthroughintroductionofweightingcoecientsre
ectingtherelativeimportanceofvariouscriteria.Themodelisappliedtoalargesteelstructurewithover3300members.Copyright?2002JohnWiley&Sons,Ltd.KEYWORDS:costoptimization;fuzzylogic;life-cycledesign;multi-

7、criteriaoptimization;optimization;steelstructures;structuraloptimizationINTRODUCTIONLife-cyclecostisthetotalcostofastructureduringitslifetime.Thelife-cyclecostofastructureincludestheinitialcosts,includingcostsofdesignandconstruction,pluscostsofoperation(

8、utilities),maintenance(includingrepair),andeventuallydismantlingordemolishingthestructureoverthelifetimeofthestructure.Iftheinitialcostofastructureislow,buttheutilitiesandmaintenancecostsarehighthestructuremaynotbeconsider