V2 = 5604 lb > Vallow = 3142 lb; Therefore, web reinforcement is required at both ends of the span.

Where:

Fs = The allowable stress in the steel, psi

= 24,000 psi

s = The spacing of the shear reinforcement, in inches. The spacing of shear reinforcement should

not exceed d/2 nor 24 inches. The maximum spacing,smax, of the shear reinforcement is:

smax = d/2 = 20.62 in/2 = 10.31 in

Use s = 8 in (modular in reinforcement CMU)

Use 1-#3 bar (Av,= 0.11 in2), with web reinforcement provided starting at 4 inches from the face of the

support, spaced at 8 inches on center, to the first 8-inch module beyond the inflection point plus one-sixteenth

of the span as shown on figure 8-10.

Max Fv = 3%f*m not to exceed 120 psi

Max Fv, must be checked as follows:

= 3%1350 lb/in2 = 110 lb/in2 < 120 lb/in2

Use Max Fv = 110 lb/in2

fv = 41.02 lb/in2 < Max Fv = 110 lb/in2

...Shear O.K.

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