Unformatted text preview: A = P / f A = 50 kips / 20 ksi A = H. Find the nominal size square timber used P = 115 kips f = 1,000 psi f = P/ A A = P / f A = 115,000 lbs / 1,000 psi A = o.k. 12" x 12" 3.33 in 2 P = f x A 90.25 in 2 1,100 psi x 90.25 in 2 9,000 lb / 15,000 lb/in 2 A = 0.60 in 2 A = ∏ x D 2 / 4 D 2 (4) (0.60 in 2 ) / 3.14 30 ft 2 A = L 2 30 ft 2 P = f x A 15 ksi x (3.14 x 1.25 2 / 4) D o = 10 in = 2 x R o Thickness shell = 0.75 in A od = 3.14 x D od 2 / 4 A od = 3.14 x (10 in) 2 / 4 = 78.5 in 2 A id = 3.14 x R id 2 R id = R od 0.75 in A id = 3.14 x (4.25 in) 2 = 56.7 in 2 A act = A od A id A act = 78.5 in 2 56.7 in 2 = 21.8 in 2 f = P / A act P = f x A act P = 9 ksi x 21.8 in 2 2.50 in 2 115 in 2 According to table A.8, the nominal size square timber is 12 x 12 = 144 in 2 Therefore: 144 in 2 > 115 in 2...
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This note was uploaded on 03/27/2012 for the course CIVE 335 taught by Professor Desormeaux during the Spring '12 term at University of Louisiana at Lafayette.
 Spring '12
 desormeaux

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