419_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 419_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 5.6-2 A fiberglass bracket of solid circular cross section has the shape and dimensions shown in the figure. A vertical load acts at the free end . Determine the minimum permissible diameter of the bracket if the allowable bending stress in the material is and ( Note: Disregard the weight of the bracket itself.) b 37 mm. 30 MPa d min D p 40 N ABCD SECTION 5.6 Design of Beams 413 Solution 5.6-2 d min 3 96 Pb ps a s a (3 Pb ) a d min 2 b a p d min 4 64 b 6 b 2 b A B D C P 2 b Problem 5.6-3 A cantilever beam of length supports a uniform load of intensity and a concentrated load (see figure). Calculate the required section modulus if . Then select a suitable wide-flange beam (W shape) from Table E-1(a), Appendix E, and recalcu- late taking into account the weight of beam. Select a new beam size if necessary. S s allow 17,000 psi S P 2750 lb q 225 lb/ft L 7.5 ft Solution 5.6-3
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• Fall '11
• Staff
• Cantilever, minimum permissible diameter, allowable bending stress, solid circular cross, fiberglass bracket ABCD

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