Where:

w = The lintel weight = 62 lb/ft

w' = The unit weight of the masonry triangle (assume no reinforced filled cells) = 50 psf

Asb = (Pe)(b)(d)

Where:

Pe=0.0027 (See table 5-9)

b = The lintel width = 7.62 in

d = The effective depth of lintel = 4.62 in

Asb = 0.0027(7.62)(4.62) = 0.095 in2

As = 0.20 in2 > Asb = 0.095 in2 therefore; the design section (shown in figure 8-3) is over-reinforced and the

compressive stress in masonry will control over the tensile stress in the reinforcement.

Where:

And;

So;

k = [(21.5 0.00568)2 2(21.5 0.00568)]

- (21.5 x 0.00568) = 0.387

j = 1 - k/3 = 1 - (0.387/3) = 0.871

Mmax = 257 ft-lb < Mrm = 1028 ft-lb

...Flexure O.K.

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