A typical warehouse roof is supported by steel bar joists as shown in the figure below. The span of each steel bar joist is 80 ft long, 4 ft deep, and are spaced every 15 ft on centers. If the dead load is 42 psf and the live load is 20 psf, determine the factored demand on member AB.
Homework Answers
Dead load=42 psf
Live load=20 psf
Factored load=1.2*42+1.6*20=82.4 psf
Tributtary width=15 ft
Factored uniform load on joist=82.4*15/1000=1.236 kip/ft
Span of joist=80 ft
Factored momemt in joist=1.236*80²/8=988.8 kip-ft
Factored shear force in joist=1.236*80/2=49.44 kips
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