469_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

469_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 5.10-10 A hollow steel box beam has the rectangular cross section shown in the figure. Determine the maximum allowable shear force that may act on the beam if the allowable shear stress in 36 Mpa. V SECTION 5.10 Shear Stresses in Beams with Flanges 463 Solution 5.10-10 Rectangular box beam Find t ± 2(10 mm) ± 20 mm ± 484.9 * 10 6 mm 4 I ± 1 12 (200)(450) 3 ² 1 12 (180)(410) 3 V allow ± t allow It Q t ± VQ It V allow t allow ± 36 MPa ; ± 273 kN ± (36 MPa)(484.9 * 10 6 mm 4 )(20 mm) 1.280 * 10 6 mm 3 V allow ± t allow
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Unformatted text preview: It Q 1.280 * 10 6 mm 3 Q (200) a 450 2 ba 450 4 b (180) a 410 2 ba 410 4 b 10 mm 200 mm 20 mm 20 mm 10 mm 450 mm Problem 5.10-11 A hollow aluminum box beam has the square cross section shown in the figure. Calculate the maximum and minimum shear stresses and in the webs of the beam due to a shear force . V 28 k t min t max 1.0 in. 1.0 in. 12 in. 05Ch05.qxd 9/25/08 2:29 PM Page 463...
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