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lrfd 029 - 36 DESIGN ADJUSTMENT FACTORS W Table 4.4 Shear...

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Unformatted text preview: 36 DESIGN ADJUSTMENT FACTORS W Table 4.4 Shear Stress Factor, CH1 Length of split on wide Length of split on wide Size of shake2 in CH face of 2" (nominal) face of 3" (nominal) and 2” (nominal) and thick lumber thicker lumber thicker lumber no split no split no shake 2.00 1/2 x wide face - 1/2 X narrow face 1/6 x narrow face 1.67 3/4 x wide face 3/4 x narrow face 1/4 x narrow face 1.50 1 1: wide face 1 x narrow face ‘ 1/3 7; narrow face 1.33 . 2 1—1/2 1; wide face 2 1—1/2 x narrow face a 1/2 X narrow face 1.00 1 Equation 5.4-3 in AF&PA/ASCE l6~95 permits an increase in shear capacity based on the assumption of no splits, checks, or shakes in continuous or cantilevered beams at distances greater than 3d from the end of the member. Thus, CH= 1.0 for all members designed using equation 5.4—3. 2 Shake is measured at the end between lines enclosing the shake and perpendicular to the loaded face. ______________________.u___—.—-————-—-—-—-——'—‘ Table 4.5 Flat Use Factor, cfu 7_ “Width Thickness 2"&3" 4" 1.00 5" 1.05 6" " ‘ 1 . 10'5 ' ‘ 8'}.- _ 105 I. 101-8; wider' I. 1.10] Decking 1.10 (2"); 1.04 (3") 1.00 ...
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