B
17.5 ft
wD = 1420 lb/ft
self weight
wL = 2100 lb/ft
A
Practice Quiz 9
Note: A one page (one sided) crib sheet is allowed during the quiz,
along with a silent, non-programmable calculator.
Clearly show your work and answer.
A simply supported steel beam is required to span 17.5 ft and support a roof having 1420 lb/ft of
dead load (from materials), the self weight, and 2100 lb/ft of live load. The beam is fully braced.
It will be A992 steel (Fy = 50 ksi and Fu= 65 ksi, E = 30 x 106 ksi). Use the chart provided.
a) Using Allowable Stress Design methodology, select the most
economical section based on bending when Fb = 33.5 ksi.
b) If a W10x15 is used (A = 4.41 in2, d = 9.99 in, tw = 0.23 in,
bf = 4.0 in, tf = 0.27 in), is it adequate for shear when
Fv = 21 ksi (ignoring self weight)?
c) [some short question from the text material]
Answers – Not provided on actual quiz!
a) Sx-req’d = 48.3 in3 (no self weight), W18x35
b) fv-max = 13.4 ksi, OK
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