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422_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 422_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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416 CHAPTER 5 Stresses in Beams (Basic Topics) Solution 5.6-7 Floor joists q ws 13.333 lb/in. s spacing of joists 16 in. w floor load 120 lb/ft 2 0.8333 lb/in. 2 L 10.5 ft 126 in. s allow 1350 psi From Appendix F : Select 2 * 10 in. joists ; Required S M max s allow 26,460 lb/in. 1350 psi 19.6 in. 3 ; M max qL 2 8 1 8 (13.333 lb/in.)(126 in.) 2 26,460 lb-in. Section modulus Solving, b min 0.150 m 150 mm ; b 3 6 562.5 * 10 6 m 3 and b 3 3375 * 10 6 m 3 S M max s allow 9,000 N # m 16 MPa 562.5 * 10 6 m 3 M max qL 2 b 8 (8.0 kN/m)(3.0 m) 2 8 9,000 N # m S b 3 6 L OADING DIAGRAM FOR ONE BALK 8.0 kN/m (8.0 kPa)(2.0 m) 2 q W 2 L b wL c 2 wL b L c W total load Problem 5.6-7 A floor system in a small building consists of wood planks supported by (nominal width) joists spaced at distance , measured from center to center (see figure). The span

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422_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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