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 hem-fir (S4S) joists to support a floor live load of 40 psf on a 12-ft simple span. The superimposed dead load will be 15 psf (not including the joist weight). The joists are to be spaced 24 in. on center. Deflection is not to exceed span/360.
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