I’m not sure how to edit my previous question. So I made new post easy for me A
ID: 1712989 • Letter: I
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I’m not sure how to edit my previous question. So I made new post easy for me A (2) floor building- only one floor is shown for simplicity. Don't worry about the columns. The beams that are under the slab dont figure ONLY USE THE OUTSIDE PARAMETER (4) Beams per floor and (4) columns. The load on each floor and on ALL beams is uniform per foot (2) End cross steel beams 20', (2) parameter steel beams 40, with (8) mechanical joins per floor. Outside size of building is 20' x 40', keep deflection to 0.25 4" thick concrete slab floor(s) weighing 150 pounds per cubic Concrete footers are rated at compression 6,000 PSF, soil / dirt is rated at 2,000 PSF foot. IQaRSELL plead. What is the weight of the combined floor siabs with live load added? 5 Points 240,000 pounds 16) What is the lightest beam that may be used on the 20' side- do one floor at a time PARAMETER ONLY. 5 Points W16-40 17) What is the lightest beam that may be used on the 40' side- do one floor at a time PARAMETER ONLY. 5 Points W14-500.Explanation / Answer
15) Wt. of One Concrete slab = 150*(4/12) = 50PSF
Live Load = 100 PSF
Hence, Total weight of the floor slab inc. live load = (100+50)* 20 *40 = 120000 Pounds
Total combined weight of all floor slabs = 120000*2 = 240000 Pounds
16) Load on the 20' side beam = (120000/120)*20 = 20000 Pounds = 1000 Pounds per foot
Maximum moment on the beam, M = w*l*l/12 = 1000*20*20*12/12 = 400000Pounds - inch
Hence, Minimum section modulus required, S = M/E = 400000/(29*10^6) = 13.8 *10^-3 (inch)^3
Section that can be used = W16-40
(17) Load on the 40' side beam = (120000/120)*40 = 40000 Pounds = 1000 Pounds per foot
Maximum moment on the beam, M = w*l*l/12 = 1000*40*40*12/12 = 1600000Pounds - inch
Hence, Minimum section modulus required, S = M/E = 1600000/(29*10^6) = 55.2 *10^-3 (inch)^3
Section that can be used = W14-500
(18)
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