ASD/LRFD Manual - American Wood Council

152 M16: FIRE DESIGN
Table M16.2-6 Design Load Ratios for Tension Members Exposed on Three Sides
(Structural Calculations at Standard Reference Conditions: C D = 1.0, C M = 1.0, C t = 1.0, C i = 1.0)
(Protected Surface in Depth Direction)
Table M16.2-6A Southern Pine Structural Glued Laminated
Timbers
Table M16.2-6B Western Species Structural Glued Laminated
Timbers
Rating 1-HOUR 1.5-HOUR 2-HOUR Rating 1-HOUR 1.5-HOUR 2-HOUR
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
Beam Depth Design Load Ratio, R s Beam Depth Design Load Ratio, R s
5.5 0.54 0.89 1.00 1.00 0.40 0.64 0.81 0.31 0.48 6 0.59 0.93 1.00 1.00 0.43 0.71 0.89 0.37 0.55
6.875 0.59 0.98 1.00 1.00 0.47 0.75 0.95 0.39 0.61 7.5 0.64 1.00 1.00 1.00 0.49 0.81 1.00 0.46 0.68
8.25 0.62 1.00 1.00 1.00 0.51 0.82 1.00 0.45 0.70 9 0.68 1.00 1.00 1.00 0.53 0.88 1.00 0.51 0.76
9.625 0.65 1.00 1.00 1.00 0.54 0.87 1.00 0.49 0.76 10.5 0.70 1.00 1.00 1.00 0.56 0.93 1.00 0.55 0.82
11 0.67 1.00 1.00 1.00 0.57 0.91 1.00 0.52 0.81 12 0.72 1.00 1.00 1.00 0.58 0.97 1.00 0.58 0.86
12.375 0.68 1.00 1.00 1.00 0.59 0.93 1.00 0.54 0.84 13.5 0.73 1.00 1.00 1.00 0.60 0.99 1.00 0.60 0.90
13.75 0.69 1.00 1.00 1.00 0.60 0.96 1.00 0.56 0.87 15 0.75 1.00 1.00 1.00 0.61 1.00 1.00 0.62 0.93
15.125 0.70 1.00 1.00 1.00 0.61 0.98 1.00 0.58 0.90 16.5 0.76 1.00 1.00 1.00 0.62 1.00 1.00 0.64 0.95
16.5 0.71 1.00 1.00 1.00 0.62 0.99 1.00 0.59 0.92 18 0.76 1.00 1.00 1.00 0.63 1.00 1.00 0.65 0.97
17.875 0.72 1.00 1.00 1.00 0.63 1.00 1.00 0.60 0.93 19.5 0.77 1.00 1.00 1.00 0.64 1.00 1.00 0.66 0.98
19.25 0.72 1.00 1.00 1.00 0.64 1.00 1.00 0.61 0.95 21 0.78 1.00 1.00 1.00 0.65 1.00 1.00 0.67 1.00
20.625 0.73 1.00 1.00 1.00 0.65 1.00 1.00 0.62 0.96 22.5 0.78 1.00 1.00 1.00 0.65 1.00 1.00 0.68 1.00
22 0.73 1.00 1.00 1.00 0.65 1.00 1.00 0.62 0.97 24 0.78 1.00 1.00 1.00 0.66 1.00 1.00 0.69 1.00
23.375 0.74 1.00 1.00 1.00 0.66 1.00 1.00 0.63 0.98 25.5 0.79 1.00 1.00 1.00 0.66 1.00 1.00 0.69 1.00
24.75 0.74 1.00 1.00 1.00 0.66 1.00 1.00 0.64 0.99 27 0.79 1.00 1.00 1.00 0.67 1.00 1.00 0.70 1.00
26.125 0.74 1.00 1.00 1.00 0.67 1.00 1.00 0.64 1.00 28.5 0.79 1.00 1.00 1.00 0.67 1.00 1.00 0.70 1.00
27.5 0.75 1.00 1.00 1.00 0.67 1.00 1.00 0.65 1.00 30 0.80 1.00 1.00 1.00 0.68 1.00 1.00 0.71 1.00
28.875 0.75 1.00 1.00 1.00 0.67 1.00 1.00 0.65 1.00 31.5 0.80 1.00 1.00 1.00 0.68 1.00 1.00 0.71 1.00
30.25 0.75 1.00 1.00 1.00 0.68 1.00 1.00 0.65 1.00 33 0.80 1.00 1.00 1.00 0.68 1.00 1.00 0.71 1.00
31.625 0.75 1.00 1.00 1.00 0.68 1.00 1.00 0.66 1.00 34.5 0.80 1.00 1.00 1.00 0.68 1.00 1.00 0.72 1.00
33 0.75 1.00 1.00 1.00 0.68 1.00 1.00 0.66 1.00 36 0.81 1.00 1.00 1.00 0.69 1.00 1.00 0.72 1.00
34.375 0.76 1.00 1.00 1.00 0.68 1.00 1.00 0.66 1.00 37.5 1.00 1.00 1.00 0.69 1.00 1.00 0.72 1.00
35.75 0.76 1.00 1.00 1.00 0.68 1.00 1.00 0.66 1.00 39 1.00 1.00 1.00 0.69 1.00 1.00 0.73 1.00
37.125 1.00 1.00 1.00 0.69 1.00 1.00 0.67 1.00 40.5 1.00 1.00 1.00 0.69 1.00 1.00 0.73 1.00
38.5 1.00 1.00 1.00 0.69 1.00 1.00 0.67 1.00 42 1.00 1.00 1.00 0.69 1.00 1.00 0.73 1.00
39.875 1.00 1.00 1.00 0.69 1.00 1.00 0.67 1.00 43.5 1.00 1.00 1.00 0.69 1.00 1.00 0.73 1.00
41.25 1.00 1.00 1.00 0.69 1.00 1.00 0.67 1.00 45 1.00 1.00 1.00 0.70 1.00 1.00 0.73 1.00
42.625 1.00 1.00 1.00 0.69 1.00 1.00 0.68 1.00 46.5 1.00 1.00 1.00 0.70 1.00 1.00 0.74 1.00
44 1.00 1.00 1.00 0.69 1.00 1.00 0.68 1.00 48 1.00 1.00 1.00 0.70 1.00 1.00 0.74 1.00
45.375 1.00 1.00 1.00 0.70 1.00 1.00 0.68 1.00 49.5 1.00 1.00 1.00 1.00 0.74 1.00
46.75 1.00 1.00 1.00 0.70 1.00 1.00 0.68 1.00 51 1.00 1.00 1.00 1.00 0.74 1.00
48.125 1.00 1.00 1.00 0.70 1.00 1.00 0.68 1.00 52.5 1.00 1.00 1.00 1.00 0.74 1.00
49.5 1.00 1.00 1.00 1.00 0.68 1.00 54 1.00 1.00 1.00 1.00 0.74 1.00
50.875 1.00 1.00 1.00 1.00 0.68 1.00 55.5 1.00 1.00 1.00 1.00 0.74 1.00
52.25 1.00 1.00 1.00 1.00 0.69 1.00 57 1.00 1.00 1.00 1.00 0.75 1.00
53.625 1.00 1.00 1.00 1.00 0.69 1.00 58.5 1.00 1.00 1.00 1.00 0.75 1.00
55 1.00 1.00 1.00 1.00 0.69 1.00 60 1.00 1.00 1.00 1.00 0.75 1.00
56.375 1.00 1.00 1.00 1.00 0.69 1.00 61.5 1.00 1.00 1.00 1.00 0.75 1.00
57.75 1.00 1.00 1.00 1.00 0.69 1.00 63 1.00 1.00 1.00 1.00 0.75 1.00
59.125 1.00 1.00 1.00 1.00 0.69 1.00 64.5 1.00 1.00 1.00
60.5 1.00 1.00 1.00 1.00 0.69 1.00 66 1.00 1.00 1.00
61.875 1.00 1.00 1.00 1.00 0.69 1.00 67.5 1.00 1.00 1.00
63.25 1.00 1.00 1.00 1.00 0.69 1.00 69 1.00 1.00 1.00
64.625 1.00 1.00 1.00 70.5 1.00 1.00 1.00
66 1.00 1.00 1.00 72 1.00 1.00 1.00
67.375 1.00 1.00 1.00 73.5 1.00 1.00 1.00
68.75 1.00 1.00 1.00 75 1.00 1.00 1.00
70.125 1.00 1.00 1.00 76.5 1.00 1.00 1.00
71.5 1.00 1.00 1.00 78 1.00 1.00 1.00
72.875 1.00 1.00 1.00 79.5 1.00 1.00 1.00
74.25 1.00 1.00 1.00 81 1.00 1.00 1.00
75.625 1.00 1.00 1.00
77 1.00 1.00 1.00
Table M16.2-6C Solid Sawn Timbers
Rating 1-HOUR 1.5-HOUR 2-HOUR
Beam Width 5.5 7.5 9.5 11.5 7.5 9.5 11.5 9.5 11.5
Beam Depth
Design Load Ratio, R s
5.5 0.66 1.00 1.00 1.00 0.52 0.73 0.88 0.40 0.55
7.5 0.75 1.00 1.00 1.00 0.63 0.90 1.00 0.55 0.74
9.5 0.80 1.00 1.00 1.00 0.70 0.99 1.00 0.64 0.86
11.5 0.83 1.00 1.00 1.00 0.74 1.00 1.00 0.69 0.93
13.5 0.85 1.00 1.00 1.00 0.77 1.00 1.00 0.73 0.98
15.5 0.87 1.00 1.00 1.00 0.79 1.00 1.00 0.76 1.00
17.5 0.88 1.00 1.00 1.00 0.81 1.00 1.00 0.78 1.00
19.5 0.89 1.00 1.00 1.00 0.83 1.00 1.00 0.80 1.00
21.5 0.90 1.00 1.00 1.00 0.84 1.00 1.00 0.81 1.00
23.5 0.91 1.00 1.00 1.00 0.85 1.00 1.00 0.82 1.00
American Wood Council