Structural design check slenderness

Effective length, l0

l0 = 0.5l [1 + k1 / (0.45 + k,) ]05 [1 + k2 / (0.45 + k2) ]05 where k,, k2 = relative stiffnesses top and bottom But conservatively, choose to use tabular method*. For critical direction condition 2 at top and condition 3 at bottom (pinned support). l0 = 0.95 x 3325 = 3158 mm

Slenderness ratio, X X = l0 / i where i = radius of gyration = (I / A)05 = h / 1205 X = 3158 x 1205 / 300 = 36.5

Limiting slenderness ratio, Xlim Xlim = 20 ABC / n05 where

Assuming min. 4 no. H25 (for fire) m = 0.56 as before (1 + 2 x 0.56)05 = 1.46 1.7 - r m where

<Concise EC2 Table 5.1>

Assuming conservatively that M01 = 0 r = 0

.'. as X < Xlim column is not slender and 2nd order moments are not required.

Column is not slender

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