Where:

Ra = The reaction at the bottom of the wall, pounds.

grouted from the top of the opening to the top of the wall.

Where:

w3 = The weight of the stiffener, lbs/ft.

Ls = The width of the stiffener, feet.

t = The thickness of the stiffener, inches.

RL = The lintel reaction, lbs.

= (P)(Lp) *+ *(w2)(d)(LL/2)

Where:

w2 = The weight of masonry above the opening, psf.

d = The height of the lintel, feet.

LL = The length of the lintel, feet.

RL = (300 lb/ft x 7.33 ft) *+ *(92 lbs/ft2)(2 ft)(12 ft/2)

= 3303 lbs

= 26.3 lbs/in2

(f) Determine the allowable axial stress, Fa.

= 7236 ft-lbs

From table B-7 two 8 inch wide 12 inch deep stiffeners with 2-#6 bars furnish a resisting moment, Furnished

Mr, as follows:

Furnished Mr = 2(3997 ft-lbs) = 7994 ft-lbs

Furnished Mr = 7994 ft-lbs *> *Required Mr = 7236 ft-lbs

...O.K.

...O.K.

(4) *Summary. *A 12 inch by 16 inch wall stiffener with 4-#6 bars, as shown in figure 6-4, will resist the

given loads.

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