고체역학 (Gere) — Stresses in Beams (Basic Topics): Problem 5.6-13

5.6-13 A two-axle carriage that is part of an overhead traveling crane in a testing laboratory moves slowly across a simple beam AB (see figure). The load transmitted to the beam from the front axle is 9 kN and from the rear axle is 18 kN. The weight of the beam itself may be disregarded. (a) Determine the minimum required section modulus $S$ for the beam if the allowable bending stress is 110 MPa, the length of the beam is 5 m, and the wheelbase of the carriage is 1.5 m. (b) Select the most economical beam (IPN shape) from Table F-2, Appendix F.