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AlMashaaerAlMugaddassahMetroProjectMashaaerMugaddassahMMMP-DD-CWK-SYSTRA-L-00014Page1/5SYSTRA5avenueduCoq–75009Paris–France–S.Aaucapitalde15596350€RCSParisB387949530–SIRET38794953000019–CodeAPE742C–TVAFR19387949530TEL:+33(0)140166100–FAX:+33(0)140166104–Email:systra@sytra.comDATEMrch4th2009REFERENCEMMMP-DD-CWK-SYSTRA-L-00014FROMM.KashaniTOMrSamHAOCCMrMak,MrMazhangOBJECTHandrailandViaductinterfaceDearMrSam,Inordertocompletethedetaileddesignofthestructures,weneedyoutochooseoneofthefollowingHandrailsandViaductinterfaceoptions.Twodifferentstructuraloptionsarepossible:•Curvedmetalplatefixedtotheconcretesurface•MetalplatefixedincastrecesstotheconcretesurfaceBothoptionsaredefinedhereafter.ARCHITECTURALCONCEPTToachieveaharmonybetweenthetwoforms,theguardrailfollowsthecurvatureoftheviaduct.Thedesignofthetwoelementsincorporatesorganicformstosoftentheirimpactonthesurroundingcountryside.Option1Constructionmethod:Theplatefollowstheshapeoftheviaduct.Theguardrailisweldedtotheplateandbothareboltedtotheconcrete.AlMashaaerAlMugaddassahMetroProjectMashaaerMugaddassahMMMP-DD-CWK-SYSTRA-L-00014Page2/5SYSTRA5avenueduCoq–75009Paris–France–S.Aaucapitalde15596350€RCSParisB387949530–SIRET38794953000019–CodeAPE742C–TVAFR19387949530TEL:+33(0)140166100–FAX:+33(0)140166104–Email:systra@sytra.comOption1,Fig.1Option1,Fig.2AlMashaaerAlMugaddassahMetroProjectMashaaerMugaddassahMMMP-DD-CWK-SYSTRA-L-00014Page3/5SYSTRA5avenueduCoq–75009Paris–France–S.Aaucapitalde15596350€RCSParisB387949530–SIRET38794953000019–CodeAPE742C–TVAFR19387949530TEL:+33(0)140166100–FAX:+33(0)140166104–Email:systra@sytra.comOption1,Fig.3Option1,Fig.4Option2Constructionmethod:Theviaductispreparedwithcastrecessestoaccommodatethefixingofthemetalplate.Theguardrailisweldedtotheplateandbothareboltedtotheconcrete.ConflictwithreinforcementisaimportantissuethatsuchberesolvedifwegowiththisoptionAlMashaaerAlMugaddassahMetroProjectMashaaerMugaddassahMMMP-DD-CWK-SYSTRA-L-00014Page4/5SYSTRA5avenueduCoq–75009Paris–France–S.Aaucapitalde15596350€RCSParisB387949530–SIRET38794953000019–CodeAPE742C–TVAFR19387949530TEL:+33(0)140166100–FAX:+33(0)140166104–Email:systra@sytra.comOption2,Fig.1Option2,Fig.2AlMashaaerAlMugaddassahMetroProjectMashaaerMugaddassahMMMP-DD-CWK-SYSTRA-L-00014Page5/5SYSTRA5avenueduCoq–75009Paris–France–S.Aaucapitalde15596350€RCSParisB387949530–SIRET38794953000019–CodeAPE742C–TVAFR19387949530TEL:+33(0)140166100–FAX:+33(0)140166104–Email:systra@sytra.comOption2,Fig.3Option2,Fig.4Toconclude,wepreferthefirstoptionasitallowsforasimplerandmoreflexibleconstruction.Bothoftheproposedoptionshavetobeconsideredwithapre-castelement(anchor)withintheUstructuretofacilitatetheassemblyprocedureatsite.Materialcharacteristics•StructuralsteeltoconformtoS235:fy=235MPa•Anchorrod(5/8”)shallbestraightandshallbeaccordingtoAASHTOM314orASTMF1554,grade105andgalvanizedaccordingtoArticle1006.09Anchorrodswillbeinstalledduringthemanufacturingoperationoftheconcretesegment.Thegapbetweentheconcreteandthesteelplatewillbefilledbyagrout.Largeholeswillbeprovidedtoallowaproperpositioningoftherailing.Wewelcomeanycommentsorsuggestionsyoumayhave.Pleasegetbacktousatyoursoonestpossibleconveniencesothatwemayadvancewiththedesign.Bestregards,M.Kashani