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A steel section is to be used as a column, it is to have a

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A steel section is to be used as a column, it is to have a slenderness ratio of 88 and it has an overall length of 6m. Calculate the radius of gyration and hence select from the table of standard steel sections, a suitable universal column 'I' section. Using this specification of the column determine the compressive stress induced for an axial load of 200kN

I dont know how to start or answer the above question, A steel section is to be used as a column, it is to have a slenderness ratio of 88 and it has an overall length of 6m. Calculate the radius of gyration and hence select from the table of standard steel sections, a suitable universal column 'I' section. Using this specification of the columndetermine the compressive stress induced for an axial load of 200kN

It is kL/r. Assume k=1.0. L=6m (change this to mm or cm, depending what units your r is in). Set that equal to 88 and solve for r. This is the required radius of gyration to reach a slenderness ratio of 88.

Then, based on the slenderness ratio, determine the allowable compressive stress on the column. From this, determine how much area you need and select a column that meets the r value and A value.