Aci 315-99 supersedes aci 315-92 and became effective August 31, 1999

 315-38
MANUAL OF CONCRETE PRACTICE
Fig. 17—Typical seismic resistant details: transverse reinforcement in columns.
Fig. 18—Typical seismic-resistant details: boundary members.

---

 315-39
DETAILS AND DETAILING OF CONCRETE REINFORCEMENT
Fig. 19(a)—Location of first bar designated only by size and spacing, one-way slab main flexural reinforcing bars. 

---

 315-40
MANUAL OF CONCRETE PRACTICE
Fig. 19(b)—Location of first bar designated only by size and spacing, one-way slab shrinkage and temperature reinforcing
bars. 

---

 315-41
DETAILS AND DETAILING OF CONCRETE REINFORCEMENT
Fig. 19(c)—Location of first bar designated only by size and spacing, reinforcing bars in walls. 

---

 315-42
MANUAL OF CONCRETE PRACTICE
Fig. 19(d)—Location of first bar designated only by size and spacing, two-way slab reinforcing bars. 

---

 315-43
DETAILS AND DETAILING OF CONCRETE REINFORCEMENT
Table 1—Standard hooks: All specific sizes recommended meet minimum 
requirements of ACI 318
*Finished bend diameters include “spring back” effect when bars straighten out slightly after being bent and are
slightly larger than minimum bend diameters in 3.7.2.
RECOMMENDED END HOOKS
All grades
D = Finished bend diameters
Bar size, No.
D,
*
in (mm)
180 degree hook
90 degree hook
A or G, ft-in (mm)
J, ft-in. (mm)
A or G, ft-in. (mm)
3 (10)
2 1/4 (60)
5 (125)
3 (80)
6 (155)
4 (13)
3 (80)
6 (155)
4 (105)
8 (200)
5 (16)
3 3/4 (95)
7 (180)
5 (130)
10 (250)
6 (19)
4 1/2 (115)
8 (205)
6 (155)
1-0 (300)
7 (22)
5 1/4 (135)
10 (250)
7 (175)
1-2 (375)
8 (25)
6 (155)
11 (275)
8 (205)
1-4 (425)
9 (29)
9 1/2 (240)
1-3 (375)
11 3/4 (300)
1-7 (475)
10 (32)
10 3/4 (275)
1-5 (425)
1-1 1/4 (335)
1-10 (550)
11 (36)
12 (305)
1-7 (475)
1-2 3/4 (375)
2-0 (600)
14 (43)
18 1/4 (465)
2-3 (675)
1-9 3/4 (550)
2-7 (775)
18 (57)
24 (610)
3-0 (925)
2-4 1/2 (725)
3-5 (1050)

---