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:

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