751.4 Reinforced Concrete Design Properties

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751.4.1 Reinforced Concrete

Classes of Reinforced Concrete

Below are classes of concrete for each type or portion of structure:

Box CulvertsB-1
Retaining WallsB or B-1
Superstructure (General)B-2
Curbs and ParapetsB-1
Safety Barrier CurbsB-1
Median Barrier CurbsB-1
Raised MedianB-2
Box GirdersB-2
Deck GirdersB-2
Prestressed Precast PanelsA-1
Prestressed I - GirdersA-1
Prestressed Double -Tee GirdersA-1
Integral End Bents (Above lower construction joint)B-2
Semi-Deep Abutments (Above construction joint under slab)B-2
Substructure (General)B
Integral End Bents (Below lower construction joint)B
Non-Integral End Bents B
Semi-Deep Abutments (Below construction joint under slab)B
Intermediate BentsB (*)
Intermediate Bent Columns, End Bents (Below construction
joint at bottom of slab in Cont. Conc. Slab Bridges)
Drilled ShaftsB-2
Cast-In-Place PileB-1

(*) In special cases when a stronger concrete is necessary for design, Class B-1 may be considered for intermediate bents (caps, columns, tie beams, web beams, collision walls and/or footings).

Unit Stresses of Reinforced Concrete
Class of ConcreteAggregate Maximumsize (Inches)Cement Factor (barrels percubic yard)\,f'c (psi)\,fc (psi)\,n (*)\,E_c (ksi)
A-13/41.6 (Min.)5,0002,00064074
B11.4 (Min.)3,0001,200103156
B-111.6 (Min.)4,0001,60083644
B-211.875 (Min.)4,0001,60083644
(*) Values of n for computations of strength only.

Reinforcing Steel
Reinforcing Steel (Grade 60)\,F_y = 60 ksi
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