folded plate bridge: steel alternative for short span bridges maury tayarani accelerated bridge...
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Folded Plate Bridge: Steel Folded Plate Bridge: Steel Alternative for Short Span BridgesAlternative for Short Span Bridges
Maury TayaraniMaury TayaraniAccelerated Bridge Program Accelerated Bridge Program
MassDOTMassDOT
Folded Plate Girder System is Folded Plate Girder System is currently applicable to simple span currently applicable to simple span
bridges with lengths up to 60 ft.bridges with lengths up to 60 ft.
Folded Plate Girders are fabricated Folded Plate Girders are fabricated using press breaksusing press breaks
The bend locations are very precisely determinedThe bend locations are very precisely determined
The fabrication process requires rotating the The fabrication process requires rotating the girdergirder
Fabrication Steps are MinimalFabrication Steps are Minimal
1- Bending girders1- Bending girders2- End Plates2- End Plates3- Minimal Tie Plates3- Minimal Tie Plates4- Shear Studs4- Shear Studs
11
33
22 44
To Resolve Availability and To Resolve Availability and Rapid DeliveryRapid Delivery
1- 1- Plate thicknesses are limited to ½ or 3/8 inchesPlate thicknesses are limited to ½ or 3/8 inches
2- Total plate width is limited to 118 inches2- Total plate width is limited to 118 inches
Stable Shape During Casting DeckStable Shape During Casting Deck
No need for internal cross framesNo need for internal cross framesNo need for external cross framesNo need for external cross frames
Design is conservatively based on girders being Design is conservatively based on girders being supported at two ends, when casting deck. The supported at two ends, when casting deck. The actual production is based on girder sitting on actual production is based on girder sitting on prestress bed and supported continuously. prestress bed and supported continuously.
Open bottom allows easy inspectionOpen bottom allows easy inspection
Experimental workExperimental work
Concept has been Concept has been extensively tested extensively tested
7,500,000 Cycles 7,500,000 Cycles
Shear TestShear Test
Uxbridge Project – Boston MassUxbridge Project – Boston Mass
Opened to Traffic on Nov 2011Opened to Traffic on Nov 2011
Folded bending – KansasFolded bending – KansasGalvanizing – Valmont, KansasGalvanizing – Valmont, KansasCasting deck- Carrara- VermontCasting deck- Carrara- VermontContractor – John RocchioContractor – John RocchioDesign – Highway Bridge ServicesDesign – Highway Bridge ServicesIndependent design check- G.F.Independent design check- G.F.Owner – MassDOTOwner – MassDOTBridge instrumentation – University of MassBridge instrumentation – University of Mass
Four Folded plate with partial Four Folded plate with partial Depth deck delivered to siteDepth deck delivered to site
Edge girders will have the curbsEdge girders will have the curbscastcast
Anchor bolts are provided to boltAnchor bolts are provided to boltThe railing onsiteThe railing onsite
FabricationFabrication
Delivery of girders to precast Delivery of girders to precast Plan for casting sub-deckPlan for casting sub-deck
Girder DeliveryGirder Delivery
Deck FormsDeck Forms
Steel ReinforcementSteel Reinforcement
Casting DeckCasting Deck
Unit Ready for DeliveryUnit Ready for Delivery
Rigging for LiftRigging for Lift
Placing Girder UnitPlacing Girder Unit
Placing Girder UnitPlacing Girder Unit
Girder EndsGirder Ends
From BelowFrom Below
Finished StructureFinished Structure
Finished RoadwayFinished Roadway
