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11_Mechanics Homework Mechanics of Materials Solution

11_Mechanics Homework Mechanics of Materials Solution -...

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Unformatted text preview: PROBLEM 1.1] LII For the Pratt bridge truss and loading shown, determine the average normal stress in member BE, knowing that the cross-sectional area of that member is 5.87 inl. SOLUTION Use eni'ivre. +Nss as JPN-e. Lady 2MH = 0 (N20) «moon (muse) - 36 A, = o A}! = i20 kip: 5t) ldps St) Lips ‘50 Rips Use por‘i't'om d‘y +MS +0 'Hie fiat-f 6F 0. seal-30v» cwH’inaa, members BD) BEJ and CE. ' +‘i‘ Z’F}= O '20 '— 30 '- :-?' F35 '—' O 5- F35: 50 kt‘lfls Foo 8.532 Vii “1 1.12 Knowing that the average normal stress in member C E of the Pratt bridge truss shown must not exceed 21 ksl for the given lo‘ading, determine the cross-sectional area of that member which will yield the most economical and safe design. Assume that both ends of the member will be adequately reinforced. PROBLEM 1.12 SOLUTION F it”; Use era-Hire 'hwss as ‘Poee but), I Hi 9 2 MH 3 O ""'_—“"‘_"—" (q\(303+(:2)C8o) +(27X803 .._ 3‘: Ar = 0 A7 = [2.0 “if: 80 hips 30 kips 30 hips Us: For'i'i’cwt 0+ +r~uss it: He fie‘P‘i o'Fa 5947'”; FED B CU'H'inq‘ members B‘DJ BEJ anal CE Fae 92b4,; = a R F“ — (93020) = o Fae ”* ‘70 kit“ A Fol 6;; ’ f9!— I20 MP5 so Mrs A 9: go . 1 cc :: '5'”: = "'"“'|"" '-' 4129 m “‘3 ...
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