472_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

472_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Unformatted text preview: 05Ch05.qxd 466 9/25/08 2:29 PM Page 466 CHAPTER 5 Stresses in Beams (Basic Topics) Built-Up Beams Problem 5.11-1 A prefabricated wood I-beam serving as a floor joist y has the cross section shown in the figure. The allowable load in shear for the glued joints between the web and the flanges is 65 lb/in. in the longitudinal direction. Determine the maximum allowable shear force Vmax for the beam. 0.75 in. z 0.625 in. 8 in. O 0.75 in. 5 in. Solution 5.11-1 Wood I-beam All dimensions in inches. Find Vmax based upon shear in the glued joints. Allowable load in shear for the glued joints is 65 lb/in. ‹ fallow f VQ I I 65 lb/in. bh3 12 fallow I Q Vmax (b t)h3 1 12 1 (5) (9.5)3 12 Q Qflange 1 (4.375)(8)3 12 170.57 in.4 Af df (5)(0.75)(4.375) Vmax ; 16.406 in.3 fallowI Q (65 lb/in.)(170.57 in.4) 16.406 in.3 676 lb ; ...
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This note was uploaded on 12/22/2011 for the course MEEG 310 taught by Professor Staff during the Fall '11 term at University of Delaware.

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