EWPAA Structural Plywood and LVL Design Manual - Engineered ...

• assuming width of lines parallel to grain is unity,then width of lines perpendicular to grain will be:60w v = cos1030= 1.97The dimensions of the first ring of nails are shown in FIGURE 10.10 as being 2(l 1 +d 1 ) and can beevaluated from:12001 = – 60 – 20cos10plywood edge distanceLVL edge distance 1 = 1140 (which is equally divisible by 60)d1D=cos10− 2 x 20d1= 570 (which is equallydivisibleby30)Therefore for the first ring of nails:IIp1=p 1=260⎡1140⎢⎢⎣12320.38 x 1061.97 x 570+12mm232⎛ 570 ⎞+ 1140⎜⎟⎝ 2 ⎠2⎛ 1140 ⎞ ⎤+ 1.97 x 570⎜⎟ ⎥⎝ 2 ⎠ ⎥⎦For the second and third rings of nails: 2 = 1140 – 60= 1080;d 2 = 570 – 60= 510 3 = 1080 – 60= 1020;d 3 = 510 – 60= 450IIIIp 2p 2p 3p 332 ⎡1080= ⎢60 ⎢⎣12= 16.33 x 10632 ⎡1020= ⎢60 ⎢⎣12= 11.13 x 1061.97 x 510+12mmmm21.97 x 450+122332⎛ 510 ⎞+ 1080⎜⎟⎝ 2 ⎠2⎛ 450 ⎞+ 1020⎜⎟⎝ 2 ⎠2⎛ 1080 ⎞ ⎤+ 1.97 x 510⎜⎟ ⎥⎝ 2 ⎠ ⎥⎦2⎛ 1020 ⎞ ⎤+ 1.97 x 450⎜⎟ ⎥⎝ 2 ⎠ ⎥⎦To determine the number of nails per ring:2 ⎛ s ⎞n = ⎜+ II ⎟⎜ ns s ⊥ dnII⎟⎝⎠where:s II = Nail spacing parallel to the grain;s⊥ = Nail spacing perpendicular to grain;133