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691_Mechanics Homework Mechanics of Materials Solution

691_Mechanics Homework Mechanics of Materials Solution - I...

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Unformatted text preview: I i N__ J L __) L 1 Fwy] [mil—”l l J " L... *3 E} ”4 a PROBI EM 6 3] 6.31 The built-up beam shown is made up by gluing together five planks. Knowing ' ‘ ' that the allowable average shearing stress in the glued joints is 60 psi,determ1ne the largest permissible vertical shear in the beam. 2 “'3 SOLUTION 2m 1,: {itslmhcmcnltsi‘ -: 93.33 in“ I,L = {Ema}? v 35. 33 in.“ I = ”I, +I, = 458.“ :n’ Q: Ag, = (smtsv = 30 m3 For ROLL SPUGJ Joint t 3 2 l.”- ’L’ = Y“? V - 3%? = (”53:2“) 6°) =. I235 lb. " PROBLEM 6.32 6-32 The built-up beam shown is made up by gluing together two % x 10-in. plywood strips and two 2 x 4in. planks. Knowing that the allowable average shearing stress in the glued Joints is 50 ps1, determine the largest permissible vertical shear in the SOLUTION I = #165300? — {ECHXGY‘ = 335.33 hr.” Gt= A3 2 (M1304) = 32 in“ t: 2+2=41n -22 'E‘It _ It": _ £586.33K'1X50) _ V- TL . 31 — 241015 -n ...
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