A steel post (E = 30 × 106 psi) having thickness t = 1/8 in. and height L = 72 in. supports a stop sign (see figure: s = 12.5 in.). The height of the post L is measured from the base to the centroid of the sign. The stop sign is subjected to wind pressure p = 20 lb/ft2 normal to its surface. Assume that the post is fixed at its base.
(a) What is the resultant load on the sign? [See Appendix D, Case 25, for properties of an octagon, n = 8].
(b) What is the maximum bending stress σmax in the post?

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STOP Section A-A Circular cutout, d 0.375 in. 5/8 in Post, 0.125 in. Ct l.5 in Co Stop sign 0.5 in. 10 n. 0 in. 0.5 in. Wind load A = 0.578 in.'' ci = 0.769 in. c2 = 0.731 in." 4-0.44867 in.4, l, = 0.161 01 in,4 Elevation view of post