Design of Lacing:
Check for Spacing
From Figure 14(b) distance between CG of channels
= 180 + 2 cy = 180 + 2 × 23.6 = 230 mm
Using angle of lacings = 45o, distance (vertical) between connections
= 2 × 230 = 460 mm.
rmin of the single (channel) element = ry = 26.1 mm.
∴ λ′ = l ′/ r ′ =460/26.1 = 17.6; This is less than either
(i) 50 or
(ii) 0.7 × λ = 0.7 × 42.9 = 30 ∴ OK.
Figure