W12x79 of A573 Grade 60 (Fy = 415 MPa) steel is used as a compression member.  It is 6.6 m long, fixed at the top and bottom, and has additional support in the weak direction at mid-height.  Properties of the section are as follows:          A = 14,500 mm^2         Ix = 258.6 x 10^6 mm^4         Iy = 84.375 x 10^6 mm^4 Calculate the effective slenderness ratio with respect to strong axis buckling using theoretical value of k.

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.