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Code Minimum Reinforcement

  • The structural system (as defined in the design section or design strip segment) is considered (beam, one-way slab, two-way slab).
  • The reinforcement type (as defined in the design section or design strip segment) is considered (PT or RC).
  • The placement of the reinforcement is based on the "min. reinforcement location" selection for the design strip segment or design section:
    • Elevated Slab – Reinforcement is at top near supports and bottom near midspan.
    • Mat Foundation – Reinforcement is at bottom near supports and top near midspan.
    • Tension Face – Reinforcement location is determined by the design moment envelope for the rule set (reinforcement may be required on both faces).
    • Top – Reinforcement is always located at the top of slab (Engineer discretion advised)
    • Bottom – Reinforcement is always located at the bottom of slab (Engineer discretion advised)
    • None – No reinforcement is provided (Engineer discretion advised)
  • The minimum reinforcement in positive areas specified in Table 8.6.2.3 is not applied (here), as that is a service reinforcement requirement, not a minimum reinforcement requirement (see Service ).
  • Section 7.6.2.1 is only applied to cross sections with bonded tendons, including two-way slabs (Section 8.6.2.2) and beams (Section 9.6.2.1).
  • Code Rules are applied as shown in the following table.
Table 1. Minimum reinforcement rule mapping
Design System RC PT
Beam 9.6.1.1 and 9.6.1.2 9.6.2.1 (bonded), 9.6.2.3
One-Way Slab 7.6.1.1, 7.7.2.3 7.6.2.1 (bonded), 7.6.2.3, 7.7.2.3 (bonded)
Two-Way Slab 8.6.1.1, 8.7.2.2 8.6.2.2 (bonded) and 8.6.2.3 (at supports only)
Parent topic: ACI 318-19 code rule selection