ASD/LRFD Manual - American Wood Council
ASD/LRFD Manual - American Wood Council
ASD/LRFD Manual - American Wood Council
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148 M16: FIRE DESIGN<br />
Table M16.2-2 Design Load Ratios for Bending Members Exposed on Four Sides<br />
(Structural Calculations at Standard Reference Conditions: C D = 1.0, C M = 1.0, C t = 1.0, C i = 1.0, C L =1.0)<br />
Table M16.2-2A Southern Pine Structural Glued Laminated<br />
Timbers<br />
Table M16.2-2B Western Species Structural Glued Laminated<br />
Timbers<br />
Rating 1-HOUR 1.5-HOUR 2-HOUR Rating 1-HOUR 1.5-HOUR 2-HOUR<br />
Beam Width 5 6.75 8.5 10.5 6.75 8.5 10.5 8.5 10.5 Beam Width 5.125 6.75 8.75 10.75 6.75 8.75 10.75 8.75 10.75<br />
Beam Depth Design Load Ratio, R s Beam Depth Design Load Ratio, R s<br />
5.5 0.10 0.16 0.20 0.22 0.01 0.01 0.01 0.02 0.03 6 0.14 0.21 0.27 0.30 0.02 0.03 0.04 0.00 0.00<br />
6.875 0.18 0.30 0.37 0.42 0.05 0.09 0.11 0.00 0.01 7.5 0.23 0.36 0.45 0.51 0.08 0.13 0.17 0.02 0.03<br />
8.25 0.25 0.42 0.52 0.59 0.11 0.18 0.23 0.04 0.06 9 0.31 0.48 0.60 0.68 0.15 0.24 0.30 0.07 0.10<br />
9.625 0.31 0.52 0.64 0.73 0.17 0.27 0.34 0.09 0.13 10.5 0.37 0.57 0.72 0.82 0.20 0.33 0.42 0.12 0.19<br />
11 0.36 0.60 0.74 0.85 0.22 0.35 0.44 0.13 0.20 12 0.42 0.65 0.82 0.93 0.25 0.41 0.52 0.18 0.26<br />
12.375 0.40 0.67 0.83 0.94 0.26 0.42 0.53 0.17 0.27 13.5 0.46 0.72 0.90 1.00 0.29 0.48 0.60 0.22 0.33<br />
13.75 0.43 0.72 0.90 1.00 0.30 0.47 0.60 0.21 0.33 15 0.49 0.77 0.97 1.00 0.33 0.54 0.68 0.26 0.39<br />
15.125 0.46 0.77 0.95 1.00 0.33 0.52 0.67 0.25 0.38 16.5 0.52 0.81 1.00 1.00 0.36 0.59 0.74 0.30 0.45<br />
16.5 0.49 0.81 1.00 1.00 0.36 0.57 0.72 0.28 0.43 18 0.54 0.85 1.00 1.00 0.38 0.64 0.79 0.33 0.49<br />
17.875 0.51 0.85 1.00 1.00 0.38 0.61 0.77 0.30 0.47 19.5 0.56 0.88 1.00 1.00 0.41 0.67 0.84 0.36 0.54<br />
19.25 0.53 0.88 1.00 1.00 0.40 0.64 0.82 0.33 0.51 21 0.58 0.91 1.00 1.00 0.43 0.71 0.88 0.39 0.57<br />
20.625 0.54 0.91 1.00 1.00 0.42 0.67 0.86 0.35 0.54 22.5 0.60 0.94 1.00 1.00 0.45 0.74 0.92 0.41 0.61<br />
22 0.56 0.93 1.00 1.00 0.44 0.70 0.89 0.37 0.58 24 0.61 0.96 1.00 1.00 0.46 0.76 0.95 0.43 0.64<br />
23.375 0.57 0.95 1.00 1.00 0.45 0.72 0.92 0.39 0.60 25.5 0.63 0.98 1.00 1.00 0.48 0.79 0.98 0.45 0.66<br />
24.75 0.58 0.97 1.00 1.00 0.47 0.75 0.95 0.40 0.63 27 0.64 1.00 1.00 1.00 0.49 0.81 1.00 0.46 0.69<br />
26.125 0.59 0.99 1.00 1.00 0.48 0.77 0.97 0.42 0.65 28.5 0.65 1.00 1.00 1.00 0.50 0.83 1.00 0.48 0.71<br />
27.5 0.60 1.00 1.00 1.00 0.49 0.78 1.00 0.43 0.67 30 0.66 1.00 1.00 1.00 0.51 0.85 1.00 0.49 0.73<br />
28.875 0.61 1.00 1.00 1.00 0.50 0.80 1.00 0.44 0.69 31.5 0.67 1.00 1.00 1.00 0.52 0.86 1.00 0.50 0.75<br />
30.25 0.62 1.00 1.00 1.00 0.51 0.82 1.00 0.46 0.71 33 0.67 1.00 1.00 1.00 0.53 0.88 1.00 0.52 0.77<br />
31.625 0.63 1.00 1.00 1.00 0.52 0.83 1.00 0.47 0.73 34.5 0.68 1.00 1.00 1.00 0.54 0.89 1.00 0.53 0.78<br />
33 0.63 1.00 1.00 1.00 0.53 0.84 1.00 0.48 0.74 36 0.69 1.00 1.00 1.00 0.55 0.90 1.00 0.54 0.80<br />
34.375 0.64 1.00 1.00 1.00 0.54 0.86 1.00 0.49 0.75 37.5 1.00 1.00 1.00 0.55 0.92 1.00 0.55 0.81<br />
35.75 0.65 1.00 1.00 1.00 0.54 0.87 1.00 0.49 0.77 39 1.00 1.00 1.00 0.56 0.93 1.00 0.55 0.82<br />
37.125 1.00 1.00 1.00 0.55 0.88 1.00 0.50 0.78 40.5 1.00 1.00 1.00 0.57 0.94 1.00 0.56 0.84<br />
38.5 1.00 1.00 1.00 0.56 0.89 1.00 0.51 0.79 42 1.00 1.00 1.00 0.57 0.95 1.00 0.57 0.85<br />
39.875 1.00 1.00 1.00 0.56 0.90 1.00 0.52 0.80 43.5 1.00 1.00 1.00 0.58 0.96 1.00 0.58 0.86<br />
41.25 1.00 1.00 1.00 0.57 0.90 1.00 0.52 0.81 45 1.00 1.00 1.00 0.58 0.96 1.00 0.58 0.87<br />
42.625 1.00 1.00 1.00 0.57 0.91 1.00 0.53 0.82 46.5 1.00 1.00 1.00 0.59 0.97 1.00 0.59 0.88<br />
44 1.00 1.00 1.00 0.58 0.92 1.00 0.53 0.83 48 1.00 1.00 1.00 0.59 0.98 1.00 0.60 0.88<br />
45.375 1.00 1.00 1.00 0.58 0.93 1.00 0.54 0.84 49.5 1.00 1.00 0.99 1.00 0.60 0.89<br />
46.75 1.00 1.00 1.00 0.59 0.93 1.00 0.55 0.85 51 1.00 1.00 0.99 1.00 0.61 0.90<br />
48.125 1.00 1.00 1.00 0.59 0.94 1.00 0.55 0.85 52.5 1.00 1.00 1.00 1.00 0.61 0.91<br />
49.5 1.00 1.00 0.95 1.00 0.55 0.86 54 1.00 1.00 1.00 1.00 0.62 0.91<br />
50.875 1.00 1.00 0.95 1.00 0.56 0.87 55.5 1.00 1.00 1.00 1.00 0.62 0.92<br />
52.25 1.00 1.00 0.96 1.00 0.56 0.88 57 1.00 1.00 1.00 1.00 0.62 0.93<br />
53.625 1.00 1.00 0.96 1.00 0.57 0.88 58.5 1.00 1.00 1.00 1.00 0.63 0.93<br />
55 1.00 1.00 0.97 1.00 0.57 0.89 60 1.00 1.00 1.00 1.00 0.63 0.94<br />
56.375 1.00 1.00 0.97 1.00 0.57 0.89 61.5 1.00 1.00 1.00 1.00 0.64 0.94<br />
57.75 1.00 1.00 0.98 1.00 0.58 0.90 63 1.00 1.00 1.00 1.00 0.64 0.95<br />
59.125 1.00 1.00 0.98 1.00 0.58 0.90 64.5 1.00 1.00 0.95<br />
60.5 1.00 1.00 0.99 1.00 0.58 0.91 66 1.00 1.00 0.96<br />
61.875 1.00 1.00 0.99 1.00 0.59 0.91 67.5 1.00 1.00 0.96<br />
63.25 1.00 1.00 0.99 1.00 0.59 0.92 69 1.00 1.00 0.97<br />
64.625 1.00 1.00 0.92 70.5 1.00 1.00 0.97<br />
66 1.00 1.00 0.93 72 1.00 1.00 0.98<br />
67.375 1.00 1.00 0.93 73.5 1.00 1.00 0.98<br />
68.75 1.00 1.00 0.93 75 1.00 1.00 0.98<br />
70.125 1.00 1.00 0.94 76.5 1.00 1.00 0.99<br />
71.5 1.00 1.00 0.94 78 1.00 1.00 0.99<br />
72.875 1.00 1.00 0.95 79.5 1.00 1.00 0.99<br />
74.25 1.00 1.00 0.95 81 1.00 1.00 1.00<br />
75.625 1.00 1.00 0.95<br />
77 1.00 1.00 0.95<br />
Note: Tabulated values assume bending in the depth direction.<br />
Table M16.2-2C Solid Sawn Timbers<br />
Rating 1-HOUR 1.5-HOUR 2-HOUR<br />
Beam Width 5.5 7.5 9.5 11.5 7.5 9.5 11.5 9.5 11.5<br />
Beam Depth<br />
Design Load Ratio, R s<br />
5.5 0.12 0.18 0.21 0.23 0.01 0.01 0.01 0.02 0.03<br />
7.5 0.27 0.40 0.48 0.53 0.10 0.15 0.18 0.02 0.03<br />
9.5 0.38 0.57 0.68 0.76 0.21 0.30 0.36 0.11 0.14<br />
11.5 0.46 0.70 0.84 0.92 0.30 0.43 0.51 0.19 0.26<br />
13.5 0.53 0.80 0.95 1.00 0.38 0.53 0.64 0.27 0.36<br />
15.5 0.58 0.87 1.00 1.00 0.43 0.62 0.74 0.33 0.45<br />
17.5 0.62 0.93 1.00 1.00 0.48 0.69 0.82 0.39 0.52<br />
19.5 0.65 0.99 1.00 1.00 0.52 0.74 0.89 0.43 0.59<br />
21.5 0.68 1.00 1.00 1.00 0.56 0.79 0.95 0.47 0.64<br />
23.5 0.71 1.00 1.00 1.00 0.59 0.84 1.00 0.51 0.69<br />
<strong>American</strong> <strong>Wood</strong> <strong>Council</strong>