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SuggestedReinforcementDetailingPracticesBasedoncommentsfromR&DandESESSCommittees

General

1. Whendetailingsubstructures,itispreferablenottouseseriesbarsunlessnecessary.Thefirstchoiceistouseslackinthebarlapstoaccommodateavarietyofheights.

2. Whenaseriesofbars isrequired,provideaminimumof2differencebetweeneachbar intheseries. Ifthe

differencefromtheshortesttothelongestisnotsufficienttomaintainthatminimum,usedifferentbarmarksforeachbarorgroupofbars.

3. Whenabarextendsfromoneconcretepourtothenext,dimensiontheminimum lap length,theembedmentlength,ortheprojection length.(SeeFigure1.) Ifthebar isbent,showtheminimum lap length. Ifthebar isstraight,showtheembedmentorprojectionlength.

Figure1

4. Bar lengths, splice lengths, and cover dimensions do not need to be adjusted to accommodate potential

fabricationorconstructiontolerancesunlessspecificallymentionedinthisdocumentortheLRFDBridgeDesignManual.

5. When detailing clear dimensions, only put the distance required (i.e., 2 clear, not 2 clear (min)). When

dimensioningdeckthickness,includeminimumwiththedimension(i.e.,9(min),not9).

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DowelsandVerticalReinforcement1. Computedowelbar lengthsassumingthedesign lapplusanadditional2 inches. Also,dimensiondowelswith

sufficientlengthtoaccommodateanyvariationinwallheight.

2. Dimensionlapsbetweendowelbarsandverticalbarsintheplansratherthantheprojectionfromthetopofthefooting.Showthelapstartingfromtheendoftheverticalbarratherthanthetopoftheconcrete.(SeeFigure2.)

3. Showverticalbarsinabutments,wingwalls,retainingwalls,andothersimilarsituationsasendingabovethetopofthefooting.(SeeFigure2.)Thisprovidesvisualclarityforthedrawing,butdoesnotnecessarilyreflecthowthebarwillbeplacedduringconstruction.

4. Computeverticalbarlengthsassumingthebarwillbeplaceddirectlyonthefooting.

Figure2

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5. Forwingwallsthatdonothaveabarriermountedontop,useaUshapedtieatthetopofthewall.(SeeFigure3.)Tiesarenotneededattheendsofwingwallsoratthebottomsofwingwallsthatcantileverpasttheendofafooting.Additionally,tiesarenotnecessaryonthetopsofwingwallswithabarriermountedontop,aslongasthe barrier dowel is adequately lapped to the wingwall vertical bars. Choose bar marks for the ties thatcorrespondtotheconcretepourassociatedwiththem,i.e.iftheconcretearoundthemisabutmentconcrete,designatethemasAbars;iftheconcreteissuperstructureconcrete,designatethemasSbars.

Figure3

6. Leavethefrontfaceverticalbar4shortoftopofwall(orseat)ormoreasrequiredtoaccountforaslopedtopsurface.ExtendlengthofA5_Eabutmentseattietoensureproperlaplength.Spaceabutmentseattiebarswiththeverticals.Useaseries iftheslope isextreme. Otherwise,keepverticalstoasingle length. Some lapswillexceedtheminimum.(SeeFigure4.)

Figure4

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AbutmentReinforcement

1. Forsemiintegralabutments,spacetheA5__Estemtiebarsalongtheentirelengthoftheabutment,evenunderthepedestals.Theyarenotreplacementsforpedestaltiebars.(SeeFigure5.)

Figure5

PierCapReinforcement

1. Spliceall longitudinaltopbarstoallowforadjustment inoverall lengthattheendsofthepiercap(especially

importantforpiercapsthatdonothavesquareends).(SeeFigure6.)2. Use the same twobarmarkswith alternating lap location for all top longitudinalbars in thepier cap. The

amountoflapmayexceedtheminimum,wherethetotallengthisshorter.(SeeFigure6.)

Figure6

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3. Donotplacesplicesat locationsofmaximummoment. Forcap topbars,donotspliceovercolumns. Ifcapbottombarsarespliced,donotspliceatthemidpointbetweencolumnsordirectlyovercolumns;placespliceadjacenttocolumn.Avoidplacingspliceswherebearinganchorrodsarelocated.(SeeFigure7.)

Figure7

4. Whendetailingendsofpiercaps,consideractualbarbendradiiandlocationstoavoidconflicts.Figure8shows

anexampleofgooddetailingofbentbarsattheendofthepiercap.

Figure8

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5. Whensinglestirrupsareusedinapiercap,includethenoteshowninFigure9.

Figure9

DeckReinforcement

1. When the total lengthof the top transversebarexceeds60 feet, splice the top transversebars toallow foradjustmentinoveralllengthattheoutsideedgeofthebridgedeck.

2. Whenthetotallengthofthetoptransversebaris60feetorless,detailthebarwith2cleartotheedgeofthe

deck,butcomputethebarlengthassuming2clear.Thiswillresultinthetoptransversebarsbeing5shorterthanthetotaldeckwidth.Detailthebottomtransversebarswith4clearfromtheedgeofthedeck.

3. When detailing concrete end diaphragms for integral, semiintegral, or parapet abutments, place transverse

diaphragmbarsparalleltothebeams.(SeeFigure10.)

Figure10