751.4 Reinforced Concrete Design Properties

From Engineering_Policy_Guide
Revision as of 09:18, 15 April 2010 by Smithk (talk | contribs) (article attached to new EPG 751)
Jump to navigation Jump to search

751.4.1 Reinforced Concrete

Classes of Reinforced Concrete

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

Box Curlverts B-1
Retaining Walls B or B-1
Superstructure (General) B-2
Curbs and Parapets B-1
Safety Barrier Curbs B-1
Median Barrier Curbs B-1
Sidewalks B-2
Raised Median B-2
Slabs B-2
Box Girders B-2
Deck Girders B-2
Prestressed Precast Panels A-1
Prestressed I - Girders A-1
Prestressed Double -Tee Girders A-1
Integral End Bents B-2
(Above lower construction joint)
Semi-Deep Abutments B-2
(Above construction joint under slab)
Substructure (General) B (*)
Integral End Bents B
(Below lower construction joint)
Semi-Deep Abutments B
(Below construction joint under slab)
Intermediate Bents B
Columns B (*)
Intermediate Bent Columns, End Bents B-1
(Below construction joint at bottom of slab in Cont. Conc. Slab Bridges)
Footings B
Drilled Shafts B-2
Cast-In-Place Pile B-1

(*) For continuous concrete slab bridges or in special cases when a stronger concrete is deemed necessary by the designer, use class B-1 for columns and end bents below construction joint at bottom of slab.

Unit Stresses of Reinforced Concrete
Class of Concrete Aggregate Maximumsize (Inches) Cement Factor (barrels percubic yard) (psi) (psi) (*) (ksi)
A-1 3/4 1.6 (Min.) 5,000 2,000 6 4074
B 1 1.4 (Min.) 3,000 1,200 10 3156
B-1 1 1.6 (Min.) 4,000 1,600 8 3644
B-2 1 1.875 (Min.) 4,000 1,600 8 3644
(*) Values of n for computations of strength only.

Reinforcing Steel
Reinforcing Steel (Grade 60) = 60 ksi