Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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68
Equivalent
Uniform
Load lb
per ft
Douglas Fir #2 or Southern Pine #2 Continuous over 2 or
3 Supports (1 or 2 Spans) Nominal Size Lumber
Douglas Fir #2 or Southern Pine #2 Continuous over 4 or
more Supports (3 or more Spans) Nominal Size of Lumber
2 ë 4 2 ë 6 2 ë 8 2 ë 10 4 ë 4 4 ë 6 4 ë 8 2 ë 4 2 ë 6 2 ë 8 2 ë 10 4 ë 4 4 ë 6 4 ë 8
3400 11 18 22 27 17 27 35 12 18 23 30 18 28 36
3600 11 17 22 27 17 26 34 11 18 23 30 17 27 35
3800 11 17 21 26 16 25 33 11 17 22 29 16 26 34
4000 11 16 21 25 16 24 32 11 17 22 28 16 25 33
4200 11 16 20 25 15 24 31 11 17 22 28 16 24 32
4400 10 16 20 24 15 23 31 10 16 22 27 15 24 31
4600 10 15 19 24 14 23 30 10 16 21 26 15 23 31
4800 10 15 19 23 14 22 29 10 16 21 26 14 23 30
5000 10 15 18 23 14 22 29 10 16 21 25 14 22 29
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Notes:
1. Courtesy APA—The Engineered Wood Association, “Concrete Forming,” 2004.
2. Spans are based on the 2001 NDS allowable stress values, C D
= 1.25, C r
= 1.0, C M
= 1.0.
3. Spans are based on dry, single-member allowable stresses multiplied by a 1.25 duration-of-load factor for 7-day loads.
4. Deflection is limited to l/360th of the span with ¼ in. maximum.
5. Spans are measured center-to-center on the supports.
TABLE 4-17
Maximum Spans, in Inches, for Lumber Framing Using Douglas-Fir No. 2 or Southern Pine No. 2 (Continued)
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