1257_Mechanics Homework Mechanics of Materials Solution

1257_Mechanics Homework Mechanics of Materials Solution -...

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Unformatted text preview: 10. 78 A column of 4.6-m effective length must carry a centric load of 525 kN. Knowing that (3— = 345 MPa and E= 200 GPa, use allowable stress design to select the wide-flange shape of 200- -mm nominal depth that should be used. PROBLEM 10.78 SOLUTION _§5/3 1! 525x10 2_ 3‘45): IO‘ ' I. I > ma PL.‘ = 1.42 525x105 (4-63 = 10,39xro“ m” 2 l0.8‘leo‘ m T‘E 1r'-(2oo no“) Tr! w zoor‘lé. \ - 5860 m3" 1m? 61E “345x106 __9_L— -.- qooz<c 106.97 = g + %(o.34nsq)--§(o.3msql‘ = 6’ _. Um I _ 345m)“ ‘ +5. [“46] ' “mp L907? = 6.2/5 = (II6.8xIO‘l(sssoxzd‘l - _ LE/n V _ 5I: lhIO's Cr. 2.54 wof“ m‘ = t lawman“, r = mix/0'3 m '-‘ 0.84154 l-‘IO'T? gamma)? r “6.8 xlo‘ 13:» 684 kl) > 525'le Use W 100 x ‘Ié. I r_. 1 [—3 WOW ...
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