3. Bar Stress Near Tension Face Equal to 0.5 fy, (fs = 0.5 fy)
Figure 4 - Strains, Forces, and Moment Arms (fs = 0.5 fy)
3.1. c, a, and strains in the reinforcement
Where c is the distance from the fiber of maximum compressive strain to the neutral axis. ACI 318-19 (22.2.2.4.2)
3.2. Forces in the concrete and steel
The area of the reinforcement in this layer has been included in the area (ab) used to compute Cc. As a result, it is necessary to subtract 0.85fc’ from fs’ before computing Cs:
