TM 5-809-3/NAVFAC DM-2.9/AFM 88-3, Chap. 3
The moment at a distance "x" feet from the bottom of the wall is "Mx" and is determined as follows:
wx 2
Mx ' Rsx &
(lb&ft/ft)
(eq 6-2)
2
If Ra in equation 6-2 for the additive condition is replaced with its equivalent from equation 6-1, equation 6-2
becomes:
Pex
whx
Mx '
%
(lb&ft/ft)
(eq 6-3)
12h
2
This Mx equation can then be simplified to:
w(h&x)
Pe
Mx ' (x)
%
(lb&ft/ft)
(eq 6-4)
12h
2
When the spacing between reinforcing bars, S, in inches, is included the equation becomes:
Sx
w(h&x)
Pe
Mx '
%
(lb&ft/S)
(eq 6-5)
12 12h
2
(1) When w = 0 and P is eccentric, the maximum bending moment occurs at the top of the wall where
x = h and equation 6-5 becomes:
6-2
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