In the following problem, the given loads are superimposed service loads; that is, they do not include the weights of the beams (unless noted otherwise). For structural steel beams (unless otherwise noted), assume a yield stress of 50 ksi (345 MPa). For timber beams, all beams are solid, rectangular shapes and Appendices E and F are applicable. Consider only moment and shear (unless otherwise noted).
Select simply supported timber beams (S4S) for the following uniformly distributed line loads and spans. Deflection is not to exceed span/240.
(a) Douglas fir, 400 lb/ft, 22-ft span
(b) hem-fir, 400 lb/ft, 18-ft span
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