Structural Detailing of Reinforcement for Economy - Simplified Design of Reinforced Concrete Buildings - page 246

Temperature
& shrinkage
reinforcement

Larger of 0.30 ˜ n1 or 0.30 ˜ n2

Larger of 0.30 ˜ n2 or 0.30 ˜ n3

Std.
hook 0.25 ˜ n1

0" 0" 0"

A s1 A s2 A s3

1 / 4 (A s3 )

≥

1 / 4 (A s1 ) 1 / 4 (A s2 )

≥ ≥

6" 6" 6" 6 "

6"

0.125 ˜ n1

0.125 ˜ n2 0.125 ˜ n2 0.125 ˜ n3

˜ n3

˜ n1 ˜ n2

Figure 8-4 Recommended Bar Details for One-Way Slabs

Larger of 0.30 ˜ n1 or 0.30 ˜ n2 Larger of 0.30 ˜ n2 or 0.30 ˜ n3

0.25 ˜ n1

Slab
reinforcement

Distribution rib
(if required)

0"

Single
bar with
standard
hook or
anchored
to develop
F y

0 " 0"

Note

6"

0.125 ˜ n2

0.125 ˜ n2 0.125 ˜ n3

˜ n3

0.125 ˜ n1

˜ n2

˜ n1

Note: At least one bar continuous or spliced with a Class B splice or mechanical or welded splice
(ACI 7.13.2.1)

(a) Joist bar details

2" for 20" forms
2.5" for 30" forms

T op slab

Slab
reinforcement

Form depth

1.5 " 3'-0"

Joist width

Face of support

(b) Joist section

(c) Plan of standard tapered
end where required
Slab
reinforcement

Top slab

#4 cont.

Form depth

4" min.
(e) Distribution rib (if required)

(d) Plan of standard square end joists

Figure 8-5 Recommended Bar Details for One-Way Joist Construction