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561_Mechanics Homework Mechanics of Materials Solution

# 561_Mechanics Homework Mechanics of Materials Solution - i...

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Unformatted text preview: i A _. l -1“. l. l_.n_ .. Fmﬁ Lon“.J A L“— L: m: A” Lnun] L A] ,A PROBLEM 5.77 PROBLEM 5.78 5.77 and 5.78 For the beam and loading shown, dwign the cross section of the beam, knowing that the grade of timber used has an allowable normal stress of 1.75 ksi. SOLUTION EquiValemewl CDhCBW'lN/feol 2044’ P = (élfé 10.2) r 3.; Mrs Beadlnﬁ momen'l n/l' A M. -- (23m) =- 7.2 143.4% = rm kcpdv. Shln =1M|m¥ " 26"“ =- 147.3? [n3 6.1: ' In: F0!” :1 Square Seo‘l‘l'on S .3 0.7 55 am:- i'fcemsv) = 6.67 ;... 1' l B =gal 5.77 and 5.78 For the beam and loading shown, design the cross section of the barn, knowing that the grade of timber used has an allowable normal streSs of 1.75 ksi. SOLUTION Cons'lwdl shear anal bénoh'mj Moment cuNec. ' Ml“w = ZSOOJLrH‘ -— 2.5 lap-ﬂ ’ 3° kip-in, 6;" = L75 [til , IH.I...; - shin " 6;" s ... i g»: a be: (33(2H3] .- 2511;“: ) = 2. #5 ln. ...
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