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Example for Beam Flexure Design
Select the lightest W section for the simply supported beam shown below. The beam length is 12ft. The nominal loading is: wd = 4.0 kip/ft (including beam weight) and wl = 8.5 kip/ft. Use grade 50 steel and assume lateral bracing is provided only at the ends of the section.
Solution:
Load Factors are: 1.2 for dead load and 1.6 for live load as per ASCE 7 specifications (these are also shown in the concrete portion of the provided manual).
Wtotal = 1.2*4.0 kip/ft + 1.6*8.5 kip/ft = 18.4 kip/ft
L = 12 ft
Mu = WL2 / 8 = 18.4 kip/ft * (12 ft) 2 / 8 = 331.2 kip*ft
φMn = 331.2 kip*ft
Enter the chart with the moment needed and the unbraced length as shown below:
φMn =331.2, Lb = 12'
Answer : W18x55
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