A 2x8 joist (b=1.5"; h-7.25") is loaded with a uniform load (w) of 60 #/ft on a simple 12' span. Determine the maximum bending stress (fb) and the maximum shear stress (fv) developed in the joist. Comments A rough cut timber beam, measuring 6" x 14" (b-6"; h=14") is loaded with with a uniform load (w) over the center 8' of a 14' simple span. Determine the maximum value of w if the allowable bending stress (Fb) is 1600 psi and the allowable shear stress (Fv) is 90 psi. @ 60 #/ 12' w#f B 31 fb = My/l = M/S fv=VQ/lb (general formula) fv = 3V/2A (for rectangular sections)