Reinforced

Load-bearing vertical structural component for one or more stories. Made with or without corbels.

Criteria
Concrete fc = 5000 psi.
Reinforcement fy = 60,000 psi.
Curves shown for full development of reinforcement.
Horizontal portion of curve is the maximum for tied columns: 0.80ΦPo.
Φ = 0.9 for ΦPn = 0
Φ = 0.7 for ΦPn ≥ 0.10f cAg
(varies from 0.9 to 0.7 for points between)
Use of Curves
Enter at left with applied factors axial load, Pu.
Enter at bottom with applied magnified factored moment, δ Mu.
Intersection point must be to the left of the curve that indicates required reinforcement.

12 x 12

14 x 14

16 x 16

18 x 18

20 x 20

24 x 24