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

 315-36
MANUAL OF CONCRETE PRACTICE
Fig. 14—Standard column ties applicable for either preassembled cages or field erection, special-shaped columns, and
columns with bars in two faces only.
Notes:
1. Alternate position of hooks in placing successive sets of ties.
2. Minimum lap shall be 12 in. (300 mm).
3. Elimination of tie for center bar in groups of three limits clear spacing to be
6 in. (150 mm) maximum. Unless otherwise specified, bars should be so
grouped.
4. Note to Architect/Engineer: Accepted practice requires that design draw-
ings show all requirements for splicing column verticals, that is, type of splice,
lap length if lapped, location in elevation, and layout in cross section.
5. Note to Detailer: Dowel erection details are required for any design
employing special large vertical bars, bundled vertical bars, staggered splices,
or specially grouped vertical bars as shown.
6. Bars must be securely supported to prevent displacement during concreting.
7. Bars shown as open circles may be accommodated provided clear spaces
between bars do not exceed 6 in. (150 mm).
8. Tie patterns shown may accomodate additional single bars between tied
groups provided clear spaces between bars do not exceed 6 in. (150 mm).
9. Minimum cover to ties, 1 1/2 in. (40 mm) for nonprestressed cast-in-place
concrete.
10. Spaces between corner bars and interior groups of three and between
interior groups may vary to accomodate average spacing > 6 in. (150 mm).
11. For average spacing < 6 in. (150 mm), one untied bar may be located
between each tied group of three and between a tied group and a corner bar.

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 315-37
DETAILS AND DETAILING OF CONCRETE REINFORCEMENT
Fig. 15—Typical wall details shown in horizontal cross section.
Fig. 16—Not recommended; closed stirrup styles considered ineffective for members subjected to high
torsion stress (based on tests by Collins and Mitchell).
Notes: all 90 degree bends as shown unless otherwise indicated on structural drawings. Vertical bars shown at hooks only. Bends
are shown as sharp angles for clarity. 
*
This dimension must be shown or specified by the Architect/Engineer.
**
If other than a standard 90 degree end hook, this dimension must be shown by the Architect/Engineer.
Notes: These styles are NOT RECOMMENDED for those members to be subjected to high torsional stress. Note lack of confine-
ment when compared with similar members with confinement shown in Fig. 12.

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