고체역학 (Beer) — Analysis and Design of Beams for Bending: Problem 5.141

5.141 Two cover plates, each \(\frac{1}{2}\) in. thick, are welded to a W27 \(\times\) 84 beam as shown. Knowing that \(l = 10 \text{ ft}\) and \(b = 10.5 \text{ in.}\), determine the maximum normal stress on a transverse section (a) through the center of the beam, (b) just to the left of \(D\).