The allowable bending stress is ơallow-24 ksi and the allowable shear stress is tallow-14 ksi 10 kip 5 kip/ft 4 ft 6 ft 4 ft select the lightest-weight wide-flange beam that will safely support the loading. use the following chart for reference. wide-flange sections or w shapes fps units flange x-x axis -yaxis web thickness width thickness area depth designation in x lb/ft w16 x 57 w16 x 50 w16 x 45 w16 x 36 w16 x 31 w12 x 45 w12 x 26 w12 x 2 in. 0.715 0.630 0.565 0.430 0.440 0.575 0.380 0.425 in. 6.72 6.68 6.65 6.51 in. 16.43 16.26 16.13 15.86 15.88 12.06 12.22 12.31 in, 0.430 0.380 0.345 0.295 0.275 0.335 0.230 0.260 in. 7.120 7.070 7.035 6.985 5.525 8.045 6.490 4.030 in in, 1.60 1.59 1.57 1.52 1.17 1.94 1.51 0.847 758 659 586 448 375 350 204 156 43.1 37.2 32.8 24.5 12.4 50.0 17.3 4.66 12.1 10.5 9.34 7.00 4.49 12.4 5.34 2.31 92.2 14.7 72.7 56.5 47.2 58.1 33.4 25.4 10.6 13.2 7.65 6.48 4.91 w16 x 31 o w16x36 w12 x 2 o w12 x45