1916.2.3 Horizontal Ties

At each column, beam reinforcement or slab bottom reinforcement shall be provided at each level that can develop a tension force equal to the maximum of Item 1 or 2:

1. Three times the load entering the column at that level, using a load combination of 1.0 × DL (self weight of structure only).
2. One and a half times the load entering the column at that level using the load combinations of (1.2 DL + 1.6 LL) or 1.4 DL.
3. For transfer elements only, in lieu of Item 1 or 2, the horizontal reinforcement shall be anchored at all supports.

This beam or slab bottom reinforcement shall be distributed around the column perimeter and shall be extended on all sides of the column into the adjacent slab for at least one-third of the span length. Where reinforcing bars cannot be extended beyond the column (e.g., at slab edges and openings), they shall be hooked or otherwise developed within the column.