02-06ChapGere.0010 - h max or Square both sides and solve...

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Problem 2.8-7 A weight W 5 4500 lb falls from a height h onto a vertical wood pole having length L 5 15 ft, diameter d 5 12 in., and modulus of elasticity E 5 1.6 3 10 6 psi (see figure). If the allowable stress in the wood under an impact load is 2500 psi, what is the maximum permissible height h ? Solution 2.8-7 Weight falling on a wood pole SECTION 2.8 Impact Loading 153 d = 12 in. W = 4,500 lb h L = 15 ft W 5 4500lb d 5 12in. L 5 15ft 5 180in. E 5 1.6 3 10 6 psi s allow 5 2500psi ( 5 s max ) Find h max A 5 p d 2 4 5 113.10 in. 2 S TATIC STRESS M AXIMUM HEIGHT
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Unformatted text preview: h max or Square both sides and solve for h : S UBSTITUTE NUMERICAL VALUES : 5 8.55 in. h max 5 (180 in.)(2500 psi) 2(1.6 3 10 6 psi) 2500 psi 39.79 psi 2 2 h 5 h max 5 L s max 2 E s max s st 2 2 s max s st 2 1 5 1 1 2 hE L s st 1 / 2 Eq. (2-59): s max 5 s st B 1 1 1 1 2 hE L s st 1 / 2 R s st 5 W A 5 4500 lb 113.10 in. 2 5 39.79 psi d W h L A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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This note was uploaded on 09/20/2009 for the course COE 3001 taught by Professor Armanios during the Spring '08 term at Georgia Institute of Technology.

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