[er n lae

With values for steel of ay = 225 MN/m2, E = 200 GN/m2,N = 1.7 and r) = 0.3(L/100fc)2, the above equation gives the graph shown in Fig. 2.9. This graph then indicates the basis of design using BS449: 1959 (amended 1964). Allowable values are provided in the standard, however, in tabular form.

80 120 160 200 Slenderness ratio L/k

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