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

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70
Equivalent
Uniform
Load lb
per ft
Hem-Fir #2 Continuous over 2 or 3 Supports (1 or 2
Spans) Nominal Size Lumber
Hem-Fir #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
3200 11 17 22 27 16 25 34 11 18 23 29 17 26 34
3400 11 17 22 27 16 25 32 11 17 22 29 16 25 33
3600 11 17 21 26 15 24 31 11 17 22 28 16 24 32
3800 10 16 21 25 15 23 31 10 17 22 28 15 24 31
4000 10 16 20 24 14 23 30 10 16 21 27 15 23 30
4200 10 15 10 24 14 22 29 10 16 21 27 14 22 30
4400 10 15 19 24 14 22 28 10 16 21 26 14 22 29
4600 10 15 19 23 13 21 28 10 15 20 26 14 21 28
4800 10 14 19 22 13 21 27 10 15 20 25 13 21 28
5000 10 14 18 22 13 20 27 10 15 20 24 13 21 27
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Notes:
1. Courtesy American Plywood 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 4-18
Maximum Spans, in Inches, for Lumber Framing Using Hem-Fir No. 2 (Continued)
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