FAILURE LOAD PREDICTION OF CASTELLATED BEAMS USING ARTIFICIAL NEURAL NETWORKS

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1、ASIANJOURNALOFCIVILENGINEERING(BUILDINGANDHOUSING)VOL.6,NOS.1-2(2005)PAGES35-54FAILURELOADPREDICTIONOFCASTELLATEDBEAMSUSINGARTIFICIALNEURALNETWORKS∗L.AmayrehandM.P.SakaDepartmentofCivilEngineering,UniversityofBahrain,BahrainABSTRACTThispaperexploresthe

2、useofartificialneuralnetworksinpredictingthefailureloadofcastellatedbeams.47experimentaldatacollectedfromtheliteraturecoverthesimplysupportedbeamswithvariousmodesoffailure,undertheactionofeithercentralsingleload,uniformlydistributedloadortwo-pointloads

3、actingsymmetricallywithrespecttothecenterlineofthespan.Thedataarearrangedinaformatsuchthat8inputparameterscoverthegeometricalandloadingpropertiesofcastellatedbeamsandthecorrespondingoutputistheultimatefailureload.Aback-propagationartificialneuralnetwor

4、kisdevelopedusingNeuro-shellpredictorsoftware,andusedtopredicttheultimateloadcapacityofcastellatedbeams.Themainbenefitinusingneuralnetworkapproachisthatthenetworkisbuiltdirectlyfromtheexperimentalortheoreticaldatausingtheself-organizingcapabilitiesofth

5、eneuralnetwork.ResultsarecomparedwithavailablemethodsintheliteraturesuchtheBlodgett’sMethodandtheBSCode.Itisfoundthattheaverageratioofactualtopredictedfailureloadsofcastellatedwas0.99forneuralnetwork,2.2forBlodgett’sMethod,and1.33forBSCode.Itiscleartha

6、tneuralnetworkprovidesanefficientalternativemethodinpredictingthefailureloadofcastellatedbeams.Keywords:castellatedbeam,failureload,neuralnetwork,back-propagation,BScode1.INTRODUCTIONCastellationistheprocessofcuttingthewebofarolledsectioninazigzagpatte

7、rn.Oneofthehalvesisthenturnedforendandweldedtotheother;thisincreasesthedepth(h)oftheoriginalbeambythedepthofthecut(d),Ref.[1].TheshapeofthecastellatedbeamisshowninFigure1.Thisshapefitsthedictionarydefinitionofcastellatedas“castle-like”orbattlemented.Hi

8、storicalDevelopmentCastellatedbeamsappeartohavebeenfirstusedin1910,Ref.[2].Knowninitiallyasthe∗Email-addressofthecorrespondingauthor:msaka@eng.uob.bh36L.AmayrehandM.P.Saka“Boydbeam”,theseproductswerefirstmarketedintheUnitedKingdominthee