Difference between revisions of "751.4 Reinforced Concrete Design Properties"

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m (→‎751.4.1 Reinforced Concrete: Per BR, minor clarifications related to barrier pay items)
 
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{| border="0" cellpadding="2" cellspacing="0" align="center"
 
{| border="0" cellpadding="2" cellspacing="0" align="center"
  
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|colspan="2"|'''Box Curlverts'''||B-1
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|colspan="2"|'''Box Culverts'''||B-1
 
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|colspan="2"|'''Retaining Walls'''||B or B-1
 
|colspan="2"|'''Retaining Walls'''||B or B-1
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|colspan="2"|'''Superstructure (General)'''||B-2
 
|colspan="2"|'''Superstructure (General)'''||B-2
 
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| ||Curbs and Parapets||B-1
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|width="20"| ||Curbs and Parapets||B-1
 
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| ||Safety Barrier Curbs||B-1
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| ||Type A, B, C, D, G and H Barriers||B-1
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| ||Median Barrier Curbs||B-1
 
 
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| ||Sidewalks||B-2
 
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| ||Prestressed Double -Tee Girders||A-1
 
| ||Prestressed Double -Tee Girders||A-1
 
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| ||Integral End Bents||B-2
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| ||Integral End Bents (Above lower construction joint)||B-2
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| ||colspan="2"|(Above lower construction joint)
 
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| ||Semi-Deep Abutments||B-2
 
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| ||colspan="2"|(Above construction joint under slab)
 
 
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|colspan="2"|'''Substructure (General)'''||B (*)
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| ||Semi-Deep Abutments (Above construction joint under slab)||B-2
 
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| ||Integral End Bents||B
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|colspan="2"|'''Substructure (General)'''||B  
 
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| ||colspan="2"|(Below lower construction joint)
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| ||Integral End Bents (Below lower construction joint)||B
 
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| ||Semi-Deep Abutments||B
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| ||Non-Integral End Bents ||B
 
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| ||colspan="2"|(Below construction joint under slab)
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| ||Semi-Deep Abutments (Below construction joint under slab)||B
 
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| ||Intermediate Bents||B
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| ||Intermediate Bents||B (*)
 
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| ||Columns||B (*)
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| ||width="485"|Intermediate Bent Columns, End Bents (Below construction <br/>joint at bottom of slab in Cont. Conc. Slab Bridges)||B-1
 
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| ||Intermediate Bent Columns, End Bents||B-1
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| ||colspan="2"|(Below construction joint at bottom of slab in Cont. Conc. Slab Bridges)
 
 
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(*) 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).
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(*) 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.
 
  
  
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[[Category:751 LRFD Manual General|751.04]]
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[[Category:751 LRFD Bridge Design Guidelines|751.04]]

Latest revision as of 08:12, 5 August 2020

751.4.1 Reinforced Concrete

Classes of Reinforced Concrete

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

Box Culverts B-1
Retaining Walls B or B-1
Superstructure (General) B-2
Curbs and Parapets B-1
Type A, B, C, D, G and H Barriers 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 (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 Bents B (*)
Intermediate Bent Columns, End Bents (Below construction
joint at bottom of slab in Cont. Conc. Slab Bridges)		 B-1
Footings B
Drilled Shafts B-2
Cast-In-Place Pile B-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 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
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