401_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

401_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Unformatted text preview: 05Ch05.qxd 9/24/08 4:59 AM Page 395 SECTION 5.5 Normal Stresses in Beams q xmax2 22 Mmax RAxmax Mmax 9.40376 * 10 Mmax 2 2 1 xmax q xmax a b 2 L2 3 qL2 8.727 kN # m smax Mmax S smax 6.493 * 103 395 N m2 smax 6.49 MPa ; 21.6 ksi ; Problem 5.5-5 Each girder of the lift bridge (see figure) is 180 ft long and simply supported at the ends. The design load for each girder is a uniform load of intensity 1.6 k/ft. The girders are fabricated by welding tree steel plates so as to form an I-shaped cross section (see figure) having section modulus S 3600 in.3. What is the maximum bending stress smax in a girder due to the uniform load? Solution 5.5-5 Bridge girder L S 180 ft q 1.6 k/ft 3 3600 in. Mmax qL2 8 smax Mmax S smax qL2 8S (1.6 k/ft)(180 ft)2(12 in./ft) 8(3600 in.3) ...
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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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