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TABLE 8.5 Allowable Spans in Feet and Inches for Low-Slope Raftera, Slope 3 in 12 or Less (No Celling) Allowable Extreme Fiber Stress in Bending F (psi). 1200 Raher Sie Sp 500 600 700 800 900 1000 1100 1300 1400 1500 1600 1700 1800 1900 10-10 11-7 0.55 9-5 0.48 7-8 14-2 124 12-4 124 O.80 9-2 10-0 17-5 13-0 0.94 13 0.82 9-2 13-7 14-9 15-4 1.56 13-3 135 10-10 15-11 16-5 16-11 2.09 17-10 033 7-11 0.29 6-6 0.24 12-1 1.09 11-9 0.94 9.7 225 15-1 1.97 0.67 10-0 140 12-10 1.73 13-9 1.50 113 1.22 20-11 191 14-2 1.65 11-7 247 15-6 12.0 0.44 10-8 14-8 0.58 8-2 0.70 1.07 10-0 O.88 121 10-5 0.99 19-6 140 16-10 121 13-9 0.99 181 11-11 2.14 2x6 16.0 0.38 7-1 12-4 8-8 0.57 16-3 080 12-8 031 13-3 0.44 11-6 0.38 048 15-3 067 13-3 0.58 10-10 067 17-1 0.94 14-10 077 L10 20-3 1.56 17-6 135 144 1.35 21-7 191 18-9 1.75 22-11 23-7 2.28 24.0 161 0.39 144 0.55 12-5 0.48 10-1 0.39 18-3 148 22-3 2.09 19-4 17-11 18-9 1.24 16-3 L07 13-3 088 033 10-6 16.0 0.29 8-7 024 15-5 033 13-4 0.29 10-11 0.24 18-9 033 16-3 0.29 13-3 0.24 1.09 2.47 19-10 20-5 12.0 1.73 18-2 15-6 0.94 12-8 0.77 22-10 23-11 14-0 2x8 0.70 11-6 0.82 12-1 0.67 1.65 14-10 1.50 181 15-9 L48 28-5 1.97 2.14 15-3 135 27-7 16-3 16-8 1.75 30-1 9.4 0.48 19-6 24.0 031 16-11 0.57 20-8 LI0 25-10 1.22 26-8 21-10 0.94 I8-11 0.82 161 29-3 2.28 25-4 24-10 1.56 224 1.35 18-3 12.0 0.44 14-8 038 11-11 031 20-6 044 17-9 038 14-6 0.31 067 16-11 0.58 13-9 0.48 23-9 0.67 0.55 15-10 048 0.80 17-11 0.70 14-8 0.57 25-2 0.80 21-9 0.70 17.9 0.57 1.09 124 19-10 20-8 140 21-6 121 1.73 23-2 1.50 18-11 191 23-11 1.65 196 1.35 33-6 191 29-1 1.65 2.09 24-7 247 26-0 1.97 20-8 2.14 21-3 2x10 160 094 16-2 0.7 107 16-11 -17-7 0.88 27-10 29-1 181 20-1 12-11 0.39 22-2 0.55 15-5 0.67 26-6 0.94 23-0 0.82 18-9 0.67 24.0 0.99 30-3 1.40 26-2 L10 314 1.56 27-2 135 122 32-6 1.48 34-7 2.09 161 35-7 2.28 1.75 36-7 2.47 12.0 19-3 0.48 15-8 0.39 20-6 0.58 16-9 0.48 1.09 24-1 094 124 25-2 1.73 28-2 1.50 23-0 1.22 29-11 30-10 31-8 1.97 2.14 25-2 25-10 2x12 16.0 19-8 0.77 1.07 20-6 0.88 121 21-5 0.99 22-2 1.10 23-9 24-5 148 24.0 1.35 1.61 1.75 "Criteria: 20 psf lve load, 10 paf drad load, live load deflection limited to Me of the span. Number shown in cach hox below the span is the minimum required modulus f elasticity in units ef 1.000.000 pai. Spans are meared along the horlenntal projection and loads ae onnnidend an applied slong the horizontal projection Sourer: Reprodaced from the Uiniform Bailding Cinde, 1991 edition, (Ret. 3), with permension of the publishers, International Conference of Building Officials Problem 8.8.C. Using Table 8.5, select the minimum size rafter for a span of 24 ft if rafters are 16 in. on center and the wood grade is Douglas fir-larch, No. 1 grade.

TABLE 8.5 Allowable Spans in Feet and Inches for Low-Slope Raftera, Slope 3 in 12 or Less (No Celling) Allowable Extreme Fiber Stress in Bending F (psi). 1200 Raher Sie Sp 500 600 700 800 900 1000 1100 1300 1400 1500 1600 1700 1800 1900 10-10 11-7 0.55 9-5 0.48 7-8 14-2 124 12-4 124 O.80 9-2 10-0 17-5 13-0 0.94 13 0.82 9-2 13-7 14-9 15-4 1.56 13-3 135 10-10 15-11 16-5 16-11 2.09 17-10 033 7-11 0.29 6-6 0.24 12-1 1.09 11-9 0.94 9.7 225 15-1 1.97 0.67 10-0 140 12-10 1.73 13-9 1.50 113 1.22 20-11 191 14-2 1.65 11-7 247 15-6 12.0 0.44 10-8 14-8 0.58 8-2 0.70 1.07 10-0 O.88 121 10-5 0.99 19-6 140 16-10 121 13-9 0.99 181 11-11 2.14 2x6 16.0 0.38 7-1 12-4 8-8 0.57 16-3 080 12-8 031 13-3 0.44 11-6 0.38 048 15-3 067 13-3 0.58 10-10 067 17-1 0.94 14-10 077 L10 20-3 1.56 17-6 135 144 1.35 21-7 191 18-9 1.75 22-11 23-7 2.28 24.0 161 0.39 144 0.55 12-5 0.48 10-1 0.39 18-3 148 22-3 2.09 19-4 17-11 18-9 1.24 16-3 L07 13-3 088 033 10-6 16.0 0.29 8-7 024 15-5 033 13-4 0.29 10-11 0.24 18-9 033 16-3 0.29 13-3 0.24 1.09 2.47 19-10 20-5 12.0 1.73 18-2 15-6 0.94 12-8 0.77 22-10 23-11 14-0 2x8 0.70 11-6 0.82 12-1 0.67 1.65 14-10 1.50 181 15-9 L48 28-5 1.97 2.14 15-3 135 27-7 16-3 16-8 1.75 30-1 9.4 0.48 19-6 24.0 031 16-11 0.57 20-8 LI0 25-10 1.22 26-8 21-10 0.94 I8-11 0.82 161 29-3 2.28 25-4 24-10 1.56 224 1.35 18-3 12.0 0.44 14-8 038 11-11 031 20-6 044 17-9 038 14-6 0.31 067 16-11 0.58 13-9 0.48 23-9 0.67 0.55 15-10 048 0.80 17-11 0.70 14-8 0.57 25-2 0.80 21-9 0.70 17.9 0.57 1.09 124 19-10 20-8 140 21-6 121 1.73 23-2 1.50 18-11 191 23-11 1.65 196 1.35 33-6 191 29-1 1.65 2.09 24-7 247 26-0 1.97 20-8 2.14 21-3 2x10 160 094 16-2 0.7 107 16-11 -17-7 0.88 27-10 29-1 181 20-1 12-11 0.39 22-2 0.55 15-5 0.67 26-6 0.94 23-0 0.82 18-9 0.67 24.0 0.99 30-3 1.40 26-2 L10 314 1.56 27-2 135 122 32-6 1.48 34-7 2.09 161 35-7 2.28 1.75 36-7 2.47 12.0 19-3 0.48 15-8 0.39 20-6 0.58 16-9 0.48 1.09 24-1 094 124 25-2 1.73 28-2 1.50 23-0 1.22 29-11 30-10 31-8 1.97 2.14 25-2 25-10 2x12 16.0 19-8 0.77 1.07 20-6 0.88 121 21-5 0.99 22-2 1.10 23-9 24-5 148 24.0 1.35 1.61 1.75 "Criteria: 20 psf lve load, 10 paf drad load, live load deflection limited to Me of the span. Number shown in cach hox below the span is the minimum required modulus f elasticity in units ef 1.000.000 pai. Spans are meared along the horlenntal projection and loads ae onnnidend an applied slong the horizontal projection Sourer: Reprodaced from the Uiniform Bailding Cinde, 1991 edition, (Ret. 3), with permension of the publishers, International Conference of Building Officials Problem 8.8.C. Using Table 8.5, select the minimum size rafter for a span of 24 ft if rafters are 16 in. on center and the wood grade is Douglas fir-larch, No. 1 grade.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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TABLE 8.5 Allowable Spans in Feet and inches for Low-Slope Raftern, Slope 3 in 12 or Less (No Celling Siat Spacing IN) Allowable Extreme Fiber Stress in Bending F (pai). 1200 500 600 700 800 900 1000 1100 1300 1400 1500 1600 1700 1800 1900 11-7 13-0 0.94 13-7 109 11-9 0.94 9.7 14-2 124 12-4 14-9 154 15-11 16-5 191 14-2 16-11 17-5 2.28 15-1 9-2 10-0 17-10 10-10 0.55 9-5 12-4 0.67 O80 10-8 1.56 13-3 12.0 2.09 033 7-11 0.29 6-6 0.44 140 12-10 1.73 13-9 247 156 10-0 058 8-2 113 0.82 9-2 8-8 14-8 1.35 10-10 0.70 107 10-0 121 10-5 0.99 19-6 1.50 1.65 11-7 181 11-11 1.97 12-4 214 12-8 2x6 160 0.38 7-1 0,48 7-8 0.39 8-8 11-3 1.22 20-11 L73 18-2 0.24 12-1 0.33 10-6 0.29 8-7 024 15-5 0.33 13-4 0.31 13-3 0.44 11-6 0.48 15-3 0.57 16-3 0.67 17-1 0.77 17-11 0.88 18-9 L10 20-3 1.35 21-7 148 22-3 2.09 1.75 22-11 23-7 2.28 24.0 1.61 144 067 13-3 0.94 14-10 1.09 15-6 124 16-3 140 16-10 121 13-9 0.99 24-10 1.56 17-6 12.0 0.55 12-5 0.48 10-1 0.39 0.80 14-0 191 18-9 2.47 19-10 20-5 19-4 0.70 I1-6 2x8 16.0 0.38 94 0.58 10-10 0.82 12-1 0.67 0.94 12-8 1.07 13-3 1.35 144 1.10 1.50 14-10 1.65 15-3 181 15-9 1.97 16-3 161 29-3 2.28 2.14 16-8 031 16-11 0.57 20-8 0.80 0.77 088 1.75 30-1 247 24.0 0.48 19-6 0.67 16-11 21-10 0.94 I8-11 1.22 26-8 1.73 23-2 135 27-7 1.91 23-11 1.48 28-5 2.09 24-7 22-10 23-11 25-10 18-3 0.55 15-10 048 12-11 1.56 224 12.0 0.44 14-8 1.09 1.24 19-10 20-8 140 17-11 0.70 14-8 0.57 21-6 25-4 26-0 1.35 18-3 16.0 029 10-11 024 18-9 033 16-3 0.38 11-11 058 13-9 0.82 155 094 121 16-11 -17-7 0.88 1.07 1.50 18-11 1.65 19-6 1.35 33-6 1.91 29-1 1.65 23-9 1.81 20-1 197 20-8 2.14 21-3 1.75 2x10 16-2 031 20-6 0.39 22-2 0.48 23-9 0.67 20-6 0.58 16-9 0.67 26-6 0.94 0.77 L.10 31-4 1.56 27-2 122 32-6 24.0 0.99 30-3 1.40 26-2 1.48 34-7 2.09 161 35-7 25-2 0.80 27-10 29-1 36-7 12.0 0.44 17-9 0.55 19-3 1.09 24-1 094 19-8 0.7 124 25-2 1.07 20-6 0.88 1.73 28-2 2.28 2.47 30-10 31-8 197 25-2 21-9 23-0 29-11 0.29 13-3 24.0 024 0.38 14-6 031 0.70 17.9 0.57 0.82 18-9 0.67 121 21-5 135 22-2 1.50 23-0 1.22 181 24-5 2.14 25-10 2x12 16.0 0.48 15-8 0.39 0.48 0.99 1.10 1.35 1.48 1.61 1.75 "Criteria: 20 psf live load, 10 puf dead load, live load deflection limited to e of the span. Number shown in cach box below the span is the minimam required modulus f elasticity in units of 1,000,000 pei. Spams are measured along the horienetal projection and loads are eonsidered an applied along the horizontal projection. Sourer: Reprodaced frem the Uiniform Bailding Cinde, 1991 edition, (Ret. 3), with perminnion of the publishers, International Conference of Bluikding Officials Problem 8.8.C. Using Table 8.5, select the minimum size rafter for a span of 24 ft if rafters are 16 in. on center and the wood grade is Douglas fir-larch, No. 1 grade.
Transcribed Image Text:TABLE 8.5 Allowable Spans in Feet and inches for Low-Slope Raftern, Slope 3 in 12 or Less (No Celling Siat Spacing IN) Allowable Extreme Fiber Stress in Bending F (pai). 1200 500 600 700 800 900 1000 1100 1300 1400 1500 1600 1700 1800 1900 11-7 13-0 0.94 13-7 109 11-9 0.94 9.7 14-2 124 12-4 14-9 154 15-11 16-5 191 14-2 16-11 17-5 2.28 15-1 9-2 10-0 17-10 10-10 0.55 9-5 12-4 0.67 O80 10-8 1.56 13-3 12.0 2.09 033 7-11 0.29 6-6 0.44 140 12-10 1.73 13-9 247 156 10-0 058 8-2 113 0.82 9-2 8-8 14-8 1.35 10-10 0.70 107 10-0 121 10-5 0.99 19-6 1.50 1.65 11-7 181 11-11 1.97 12-4 214 12-8 2x6 160 0.38 7-1 0,48 7-8 0.39 8-8 11-3 1.22 20-11 L73 18-2 0.24 12-1 0.33 10-6 0.29 8-7 024 15-5 0.33 13-4 0.31 13-3 0.44 11-6 0.48 15-3 0.57 16-3 0.67 17-1 0.77 17-11 0.88 18-9 L10 20-3 1.35 21-7 148 22-3 2.09 1.75 22-11 23-7 2.28 24.0 1.61 144 067 13-3 0.94 14-10 1.09 15-6 124 16-3 140 16-10 121 13-9 0.99 24-10 1.56 17-6 12.0 0.55 12-5 0.48 10-1 0.39 0.80 14-0 191 18-9 2.47 19-10 20-5 19-4 0.70 I1-6 2x8 16.0 0.38 94 0.58 10-10 0.82 12-1 0.67 0.94 12-8 1.07 13-3 1.35 144 1.10 1.50 14-10 1.65 15-3 181 15-9 1.97 16-3 161 29-3 2.28 2.14 16-8 031 16-11 0.57 20-8 0.80 0.77 088 1.75 30-1 247 24.0 0.48 19-6 0.67 16-11 21-10 0.94 I8-11 1.22 26-8 1.73 23-2 135 27-7 1.91 23-11 1.48 28-5 2.09 24-7 22-10 23-11 25-10 18-3 0.55 15-10 048 12-11 1.56 224 12.0 0.44 14-8 1.09 1.24 19-10 20-8 140 17-11 0.70 14-8 0.57 21-6 25-4 26-0 1.35 18-3 16.0 029 10-11 024 18-9 033 16-3 0.38 11-11 058 13-9 0.82 155 094 121 16-11 -17-7 0.88 1.07 1.50 18-11 1.65 19-6 1.35 33-6 1.91 29-1 1.65 23-9 1.81 20-1 197 20-8 2.14 21-3 1.75 2x10 16-2 031 20-6 0.39 22-2 0.48 23-9 0.67 20-6 0.58 16-9 0.67 26-6 0.94 0.77 L.10 31-4 1.56 27-2 122 32-6 24.0 0.99 30-3 1.40 26-2 1.48 34-7 2.09 161 35-7 25-2 0.80 27-10 29-1 36-7 12.0 0.44 17-9 0.55 19-3 1.09 24-1 094 19-8 0.7 124 25-2 1.07 20-6 0.88 1.73 28-2 2.28 2.47 30-10 31-8 197 25-2 21-9 23-0 29-11 0.29 13-3 24.0 024 0.38 14-6 031 0.70 17.9 0.57 0.82 18-9 0.67 121 21-5 135 22-2 1.50 23-0 1.22 181 24-5 2.14 25-10 2x12 16.0 0.48 15-8 0.39 0.48 0.99 1.10 1.35 1.48 1.61 1.75 "Criteria: 20 psf live load, 10 puf dead load, live load deflection limited to e of the span. Number shown in cach box below the span is the minimam required modulus f elasticity in units of 1,000,000 pei. Spams are measured along the horienetal projection and loads are eonsidered an applied along the horizontal projection. Sourer: Reprodaced frem the Uiniform Bailding Cinde, 1991 edition, (Ret. 3), with perminnion of the publishers, International Conference of Bluikding Officials Problem 8.8.C. Using Table 8.5, select the minimum size rafter for a span of 24 ft if rafters are 16 in. on center and the wood grade is Douglas fir-larch, No. 1 grade.
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