ARC322 Homework 8 SOLUTION 2008

# ARC322 Homework 8 SOLUTION 2008 - ARC322 Homework 8 30...

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ARC322 Homework 8 30 Points Total … 1 Point Each Diagram M = PL/4 = (12,500 LB x 24 ft)/4 = 75,000 ft-lb 1 point S = M/ f = (75,000 ft-lb x 12 in/ft)/24,000 lb/in 2 = 37.5 in 3 1 point NOTE: Final test MUST be shown for each member selected. W16x26 S = 38.4 in 3 > 37.5 in 3 … OK 1 point This one is close … if you added the beam weight, you will see that it exceeds the S of a W16x26. 1 Point EC if they did this. C15x33.9 S = 42 in 3 > 37.5 in 3 … OK 1 point Rectangular Tube 14x6x5/16 S = 41.2 in 3 > 37.5 in 3 … OK OR 12x8x5/15 S = 39.8 in 3 >37.5 in 3 … OK OR 1 point M = w L 2 /8 = (1,850 lb/ft x (28 ft) 2 )/8 = 181,300 ft-lb 1 point S = M/ f = (181,300 ft-lb x 12 in/ft)/24,000 lb/in 2 = 90.65 in 3 1 point W21x50 S = 94.5 in 3 > 90.65 in 3 … OK 1 point There are no Standard Channels with an S > 53.8 in 3 1 point Rectangular Tube 20 x 12 x 5/16 S = 108 in 3 > 90.65 in 3 … OK 1 point

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ARC322 Homework 8 M = PAB/L = (17,750 lb x 15 ft x 6 ft)/21 ft = 76,071 ft-lb 1 point S = M/
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ARC322 Homework 8 SOLUTION 2008 - ARC322 Homework 8 30...

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