474_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

474_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Unformatted text preview: 05Ch05.qxd 9/25/08 468 2:29 PM Page 468 CHAPTER 5 Stresses in Beams (Basic Topics) Solution 5.11-3 h b h1 62 in. t 20 in. tf I h tf Qflange Qflange 5 in. 16 btf a b 610 in3 2 1 in. bh3 12 60 in. I V t)h13 12 (b 4 F 4 4.284 * 10 in. Qflange F Af df f 280 k VQflange 1994 * 103 lb.in. F 21 VQ I 2F ; 1994 lb/in. Problem 5.11-4 A box beam of wood is constructed of two y 25 mm 260 mm * 50 mm boards and two 260 mm * 25 mm boards (see figure). The boards are nailed at a longitudinal spacing s 100 mm. If each nail has a allowable shear force F 1200 N, what is the maximum allowable shear force Vmax? z O 50 mm 50 mm 260 mm 260 mm Solution 5.11-4 Wood box beam All dimensions in millimeters. b 260 b1 h s F f 310 h1 260 100 mm nail spacing allowable shear force for one nail shear flow between one flange and both webs fallow 2F s 25 mm 260 2(50) 2(1200 N) 100 mm f I 160 24 kN/ m 1200 N VQ I 1 (bh3 12 Q Qflange fallow I Q Vmax b1h3) 1 Afdf 411.125 * 106 mm4 (260)(25)(142.5) 3 926.25 * 10 mm4 Vmax fallowI Q 10.7 kN (24 kN/ m)(411.25 * 106 mm4) . 926.25 * 103 mm3 ; ...
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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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