(PLEASE ONLY DO PROBLEM 2.7) For Problems 2.1 through 2.6, given the loads speci
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(PLEASE ONLY DO PROBLEM 2.7)
For Problems 2.1 through 2.6, given the loads specified, compute the maximum combined load using the ASCE 7-16 load combinations for allowable stress design. P2.1 D-50 psf, Lr = 75 psf, R = 8 psf, and S = 20 psf. (Ans: case 3 = 125 psf) Pa.a D-45 psf and L- 60 psf. P2-3 D-2750 lb, L-4500 lb, LT-1500 lb, R-1250 lbs, and s-1000 lbs. (Ans: case 6-7250 lb) P2.4 D-87 psf and L-150 psf. P2.5 D-75 psf, L-35 psf, and R-12 psf. (Ans: case 3-110 psf) P2.6 D-13k,L-32 k, w--22 k, E, + Eh = 16 k, and-E, + Eh =-16 k. Section 2.6 For Problems 2.7 through 2.12, given the loads specified, compute the maximum combined load using the ASCE 7-16 load combinations for strength design. P2.7 Repeat Problem 2.1. (Ans: case 3 180 psf)Explanation / Answer
Dead Load= D=50 psf
Roof live load=Lr=75 psf
Rain Load=R=8 psf
Snow Load=S=20 psf
Load combinations per ASCE 7-16 for strength design are:
1)1.4D = 1.4*50=70 psf
2)1.2D+0.5(Lr+S+R)
1.2D+0.5Lr = (1.2*50)+(0.5*75)=97.5 psf
1.2D+0.5S=(1.2*50)+(0.5*20)=70psf
1.2D+0.5R=(1.2*50)+(0.5*8)=64psf
3)1.2D+1.6(Lr or S or R)
1.2D+1.6Lr = (1.2*50)+(1.6*75)=180 psf
1.2D+1.6R=(1.2*50)+(1.6*8)=72.8 psf
1.2D+1.6S = (1.2*50)+(1.6*20)=92 psf
The other combinations 4 throught 7 are not going to govern.
From the above load combinations, the one that governs the design is
case 3 : 1.2D+1.6Lr = (1.2*50)+(1.6*75)=180 psf
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