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423_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

423_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 5.6-8 The wood joists supporting a plank floor (see figure) are in cross section (actual dimensions) and have a span length . The floor load is , which includes the weight of the joists and the floor. Calculate the maximum permissible spacing of the joists if the allowable bending stress is . (Assume that each joist may be represented as a simple beam carrying a uniform load.) 15 MPa s 3.6 kPa L 4.0 m 40 mm * 180 mm
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