고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.23

6.23 For the beam and loading shown, determine the largest shearing stress in section n–n. (From accompanying Figure P6.21 and P6.23): Loading: A simply supported beam of 50 in. span (20 in + 10 in + 20 in) with two 25-kip concentrated loads at 20 in from each support. Section n–n: Located between the left support and the first load. Cross-section: An inverted channel (U-shape) with: Overall width = 8 in. Overall height = 7.25 in. Uniform thickness \( t = 3/4 \) in. for both the top flange and the vertical webs.