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Section 3
3-33
Distance from extreme compression fiber to centroid of tension
reinforcement, d, is assumed to be equal to:
• for longitudinal bending: slab depth - concrete cover - ½ dia.
of min. size bar
• for transverse bending: slab depth - concrete cover - 1½ dia. of
min. size bar
Strength reduction factor is established in accordance with Section
9.3.2.
The program allows the designer, as an option, to use the Wood-
Armer equations for reinforcement calculations, as follows:
a. Mx, My, and Mxy are fetched or calculated, as described
above. They are used to compute the values of design
moments, Mxd and Myd.
b. For top reinforcement, the program computes:
Mx1 = Mx + abs(Mxy)
My1 = My + abs(Mxy)
Mx2 = Mx + abs(Mxy
2
/ My)
My2 = My + abs(Mxy
2
/ Mx)
If both Mx1 and My1 are positive, Mxd = Mx1 and Myd = My1.
If both Mx1 and My1 are negative, Mxd = 0 and Myd = 0.
If Mx1 is negative and My1 positive, Mxd = 0 and Myd =
My2.
If My1 is negative and Mx1 positive, Mxd = Mx2 and Myd =
0.
c. For bottom reinforcement:
Mx1 = Mx - abs(Mxy)
My1 = My - abs(Mxy)
Mx2 = Mx - abs(Mxy
2
/ My)
My2 = My - abs(Mxy
2
/ Mx)