고체역학 (Gere) — Stresses in Beams (Basic Topics): Problem 5.6-7

5.6-7 A simple beam $AB$ is loaded as shown in the figure. (a) Calculate the required section modulus $S$ if $\sigma_{\text{allow}} = 124 \text{ MPa}$, $L = 9.75 \text{ m}$, $P = 13 \text{ kN}$, and $q = 6.6 \text{ kN/m}$. Then select a suitable I-beam (IPN shape) from Table F-2, Appendix F, and recalculate $S$ taking into account the weight of the beam. Select a new beam size if necessary. (b) What is the maximum load $P$ that can be applied to your final beam selection in part (a)?