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Wz1 = weight per unit length of the sign = 900 lb/ft, Wx2 = spatially variable wind load intensity (per unit length) in the x-direction = 700 lb/ft*z lbs,
Fy1 = net wind force in the y-direction = 8000 lb, and Fz1 = net weight of the post (using a specific weight of 490 lb/ft^3)
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