05-01ChapGere.0006

05-01ChapGere.0006 - for each girder is a uniform load of...

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Problem 5.5-4 A simply supported wood beam AB with span length L 5 3.5 m carries a uniform load of intensity q 5 6.4 kN/m (see figure). Calculate the maximum bending stress s max due to the load q if the beam has a rectangular cross section with width b 5 140 mm and height h 5 240 mm. Solution 5.5-4 Simple beam with uniform load 290 CHAPTER 5 Stresses in Beams (Basic Topics) A L B q h b L 5 3.5 m q 5 6.4 kN/m b 5 140 mm h 5 240 mm s max 5 M max S 5 3 qL 2 4 bh 2 M max 5 qL 2 8 Ê S 5 bh 2 6 Substitute numerical values: s max 5 3(6.4 kN / m)(3.5 m) 2 4(140 mm)(240 mm) 2 5 7.29 MPa 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
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Unformatted text preview: for each girder is a uniform load of intensity 1.6 k/ft. The girders are fabricated by welding three steel plates so as to form an I-shaped cross section (see figure) having section modulus S 5 3600 in 3 . What is the maximum bending stress s max in a girder due to the uniform load? Solution 5.5-5 Bridge girder L 5 180 ft q 5 1.6 k/ft S 5 3600 in. 3 s max 5 (1.6 k / ft)(180 ft) 2 (12 in. / ft) 8(3600 in. 3 ) 5 21.6 ksi s max 5 M max S 5 qL 2 8 S M max 5 qL 2 8 L q A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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