고체역학 (Beer) — Pure Bending: Problem 4.37

4.37 Three wooden beams and two steel plates are securely bolted together to form the composite member shown. Using the data given in the table, determine the largest permissible bending moment when the member is bent about a horizontal axis. Material Properties: Wood: Modulus of elasticity \( E_w = 2 \times 10^6 \) psi, Allowable stress \( \sigma_{all,w} = 2000 \) psi Steel: Modulus of elasticity \( E_s = 29 \times 10^6 \) psi, Allowable stress \( \sigma_{all,s} = 22,000 \) psi Geometry: The section consists of three wooden beams (each 2 in. wide) and two steel plates (each 1/4 in. thick). All components have a height of 10 in.