고체역학 (Gere) — Stresses in Beams (Basic Topics): Problem 5.6-15

5.6-15 A propped cantilever beam $ABC$ (see figure) has a shear release just right of the mid-span. (a) Select the most economical wood beam from the table in Appendix G; assume $q = 800 \text{ N/m}$, $L = 5 \text{ m}$, $\sigma_{aw} = 12 \text{ MPa}$, and $\tau_{aw} = 2.6 \text{ MPa}$. Include the self-weight of the beam in your design. (b) If a UPN 180 steel beam is now used for beam $ABC$, what is the maximum permissible value of load variable $q$? Assume $\sigma_{as} = 110 \text{ MPa}$ and $L = 3 \text{ m}$. Include the self-weight of the beam in your analysis.