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570_Mechanics Homework Mechanics of Materials Solution

# 570_Mechanics Homework Mechanics of Materials Solution -...

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Unformatted text preview: PROBLEM 5.87 if? and 5.83 Knowing that the allowable normal stress for the steel used is 24 k31,.select the most economical S—shape beam to support the loading shown. SOLUTION +DEMc=O -l2A J. ccnmm «mam: o A 3 9 Rip: +jZMA=o IZC. - (QCCXsﬁ—(wmgh o C. =- 27 kllf‘l ‘I kilos. = q - (CNS) 2 - a kilo: = «9+2? '13 k"F's V \l Ginsu“ v 1-3.5 16'9"” (g'zxsx-n = -I3-\$ lap-fr (ac—en = —54 kip-H (3)(l8) 1‘ 54 k\.P-'¥+ ganglia: momen’l‘st M. = 0 M5 0 4 13.5 «.- :3.5' — #3.: = o + 54 e 54 MPH 5‘! - 54 Maxi-nun ‘M‘ '-' 5‘4 {6'5an 9 £49 Idle-in 6d} 2 1‘1, k6f 6 49 2"! =' 21 M3 Li: L‘hs‘l' S ‘sllopee‘ beam 3 was}. 9 ...
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