design a 12" wide beam
with a simple span of 28′ to carry PD = 2000lb &
PL = 2000lb at the center of the span
factor loads 1.2D+1.6L
Calculate Mu = PuL/4
f’c = 4,000lb/in2 fy =
60,000lb/in2
estimate height
depth = h - 2.75
Estimate reinforcement – As =
Mu/4dest
Check minimum reinforcing requirements
Asmin = (200/fy)bh
Asmin = 3(√f’c/fy)bh
Select reinforcing bars
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