05-02ChapGere.0005

05-02ChapGere.0005 - Joists Planks s s s L b = 40 mm h =...

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Problem 5.6-8 The wood joists supporting a plank floor (see figure) are 40 mm 3 180 mm in cross section (actual dimensions) and have a span length L 5 4.0 m. The floor load is 3.6 kPa, which includes the weight of the joists and the floor. Calculate the maximum permissible spacing s of the joists if the allowable bending stress is 15 MPa. (Assume that each joist may be represented as a simple beam carrying a uniform load.) Solution 5.6-8 Spacing of floor joists 308 CHAPTER 5 Stresses in Beams (Basic Topics)
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Unformatted text preview: Joists Planks s s s L b = 40 mm h = 180 mm q 5 ws S 5 M max s allow 5 wsL 2 8 s allow 5 bh 2 6 M max 5 qL 2 8 5 wsL 2 8 S 5 bh 2 6 S PACING OF JOISTS Substitute numerical values: 5 0.450 m 5 450 mm s max 5 4(40 mm)(180 mm) 2 (15 MPa) 3(3.6 kPa) (4.0 m) 2 s max 5 4 bh 2 s allow 3 wL 2 L 5 4.0 m w 5 floor load 5 3.6 kPa s allow 5 15 MPa s 5 spacing of joists q L 5 4.0 m A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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