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1、OptimalPlanningandSchedulingforRepetitiveConstructionProjects12KhaliedHyariandKhaledEl-Rayes,M.ASCEAbstract:Thispaperpresentsamultiobjectiveoptimizationmodelfortheplanningandschedulingofrepetitiveconstructionprojects.Themodelenablesconstructionplannerstogenerateandevaluateoptimalc
2、onstructionplansthatminimizeprojectdurationandmaximizecrewworkcontinuity,simultaneously.Thecomputationsinthepresentmodelareorganizedinthreemajormodules:scheduling,optimi-zation,andrankingmodules.First,theschedulingmoduleusesaresource-drivenschedulingalgorithmtodeveloppracticalsche
3、dulesforrepetitiveconstructionprojects.Second,theoptimizationmoduleutilizesmultiobjectivegeneticalgorithmstosearchforandidentifyfeasibleconstructionplansthatestablishoptimaltradeoffsbetweenprojectdurationandcrewworkcontinuity.Third,therankingmoduleusesmultiattributeutilitytheoryto
4、rankthegeneratedplansinordertofacilitatetheselectionandexecutionofthebestoverallplanfortheprojectbeingconsidered.Anapplicationexampleisanalyzedtoillustratetheuseofthemodeldemonstrateitsnewcapabilitiesinoptimizingtheplanningandschedulingofrepetitiveconstructionprojects.DOI:10.1061/
5、ASCE0742-597X200622:111CEDatabasesubjectheadings:Roadconstruction;Highwayconstruction;Scheduling;Resourcemanagement;Optimization;Evolutionarycomputation;Computermodels;Constructionmanagement.IntroductionAvailableplanningandschedulingmodelsthatfocusedonminimizingthedurationof
6、repetitiveconstructionprojectscanbeExamplesofrepetitiveconstructionprojectsincludehighways,groupedintotwomaincategories:1modelsthatprovidestricttunnels,bridges,railways,pipelinenetworks,sewermains,high-compliancewithcrewworkcontinuitySelinger1980;and2risebuildings,andhousing
7、developmentprojects.InthisclassofmodelsthatallowinterruptionstocrewworkcontinuityRussellprojects,constructioncrewsareoftenrequiredtorepeatthesameandCaselton1988;El-Rayes2001.Allthesemodelsarecapableworkinvariouslocationsoftheproject,movingfromoneloca-ofgeneratingasingleoptimalso
8、lutionthatminimizesthedura-tionto
