allowable load = aR x A = 181.45 x 106 x 19.92 x 10~3 = 3.61 MN

With a factor of safety of 3 the maximum permissible load therefore becomes

Example 22

An 8 m long column is constructed from two 400 mm x 250 mm I-section joists joined as shown in Fig. 2.15. One end of the column is arranged to be fixed and the other free and a load equal to one-third of the Euler load is applied. Determine the load factor provided if the Perry-Robertson formula is used as the basis for design.


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