precast concrete beams -...
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New StandardsNew Standards
Presented by:Presented by:
Amy Eskridge, Amy Eskridge, P.E.P.E.
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OverviewOverview
Prestressed IPrestressed I--GirdersGirdersDecked Slab BeamsDecked Slab Beams
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Prestressed IPrestressed I--GirderGirder
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Tx28 Tx34 Tx40 Tx46
Tx54 Tx62 Tx70
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NewNew II--GGirderirderIIGGD, ID, IGGEB, IEB, IGGMS, IMS, IGGND, AIND, AIGG
OldOld II--BBeameamIIBBD, ID, IBBEB, IEB, IBBMS, IMS, IBBND, AIND, AIBB
NomenclatureNomenclature
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Prestressed IPrestressed I--GirderGirder
Benefits of the new sectionsBenefits of the new sectionsImproved L/D ratiosImproved L/D ratiosWider girder spacingWider girder spacingBetter stabilityBetter stabilityBetter durabilityBetter durability
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New Standard DrawingsNew Standard Drawings
2424’’, 28, 28’’, 30, 30’’, 38, 38’’, and 44, and 44’’ RdwyRdwy00°°, 15, 15°°, 30, 30°°, and 45, and 45°° skewsskewsSpans 40Spans 40’’ to 125to 125’’Tx28 through Tx54Tx28 through Tx54
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Implementation ScheduleImplementation Schedule
Girder TypeGirder Type Initial LettingInitial Letting
Tx46 and Tx62Tx46 and Tx62 Dec 2007Dec 2007
Tx28, Tx34, and Tx28, Tx34, and Tx70Tx70 Sept 2008Sept 2008
Tx40 and Tx54Tx40 and Tx54 Sept 2010Sept 2010
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Standard Standard ““RetirementRetirement””
StandardStandard Proposed DateProposed Date New New StandardStandard
2424’’ RdwyRdwy, , TyTy IVIV
Jan 2009Jan 2009
Oct 2009Oct 2009
Oct 2011Oct 2011
Tx46Tx46
all all TyTy A, B, CA, B, C Tx28 and Tx28 and Tx34Tx34
other other TyTy IVIV Tx54Tx54
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Design with PSTRS14Design with PSTRS14
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IGD IGD -- Girder DetailsGirder Details
No No blockoutblockout for thickened slabfor thickened slab
ShearShear
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IGTS IGTS –– Thickened Slab DetailsThickened Slab Details
Min 2Min 2”” haunch at CL bearinghaunch at CL bearing
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IGTS IGTS –– Thickened Thickened Slab DetailsSlab Details
Tightened Tightened spacing of #5 spacing of #5 barsbars
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IGEB IGEB -- Bearing DetailsBearing Details
Nominal CL 12Nominal CL 12””everywhereeverywhereEnd offset 3End offset 3””everywhereeverywhere
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IGEB IGEB -- Bearing DetailsBearing Details
Min substructure widths increasedMin substructure widths increased
NewNew
OldOld
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IGMS IGMS –– MiscMisc Slab DetailsSlab Details
Overhang bracket noteOverhang bracket note
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4000 lb
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IGND IGND –– NonNon--Standard SpansStandard SpansIGCS IGCS –– Continuous SlabContinuous SlabMEBR(C) MEBR(C) –– added added TxGirdersTxGirders, , added horizontal bracing detailadded horizontal bracing detail
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Abutments/BentsAbutments/Bents
Max. abut foundation spacing 11Max. abut foundation spacing 11’’Bearing seat 3Bearing seat 3’’--00””Column Column diadia. 6. 6”” less than capless than cap
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SpansSpans
Standard 8Standard 8”” slabslabOverhangOverhang
Deck drainsDeck drains
Girder TypeGirder Type UsualUsual MinimumMinimumTx28 Tx28 -- Tx54Tx54 33’’
3.53.5’’22’’
Tx62 Tx62 --Tx70Tx70 22’’
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WideningsWidenings
Use Use TxGirdersTxGirders for allfor allNo diaphragm hole details No diaphragm hole details includedincluded
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Decked Slab BeamDecked Slab Beam
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2006 PCI Design Award
Battleground Creek
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Decked Slab Decked Slab BeamBeam
2 depths2 depths3 widths3 widths
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Decked Slab BeamDecked Slab Beam
Benefits of the new sectionsBenefits of the new sectionsReduce number of beamsReduce number of beamsEliminate CIP concreteEliminate CIP concreteRapid installationRapid installationShallow superstructureShallow superstructureOnOn--system/offsystem/off--systemsystem
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Decked Slab BeamDecked Slab Beam
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New Standard DrawingsNew Standard Drawings
2424’’ RdwyRdwy00°°, 15, 15°°, and 30, and 30°° skewsskewsSpans 30Spans 30’’ to 60to 60’’6DS20 and 6DS236DS20 and 6DS23
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BDSB BDSB –– Bent DetailsBent Details
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ADSB ADSB –– Abut Abut DetailsDetails
BackwallBackwallheight not height not based on based on ““yy””Always fixed Always fixed dimensiondimension
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SDSB SDSB –– Span DetailsSpan Details
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SDSB SDSB –– Span DetailsSpan Details
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DSBRA DSBRA –– Rail Rail
DetailsDetails
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DSBRA DSBRA –– Rail DetailsRail Details
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Horizontal curveHorizontal curveChange in crossChange in cross--slopeslopeSkew w/ vertical curveSkew w/ vertical curve
““Things to AVOIDThings to AVOID””
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““Things to AVOIDThings to AVOID””
Skipping ACP toppingSkipping ACP topping
Simple GeometrySimple Geometry
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WrapWrap--upup
Begin using NOWBegin using NOW
Improved span, spacingImproved span, spacing
New design parametersNew design parameters
Coming soonComing soon
Great for short, simple Great for short, simple crossingscrossings
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Questions ? ?Questions ? ?
Amy Eskridge, P.E.Amy Eskridge, [email protected]@dot.state.tx.us(512) 416(512) 416--22612261