A W12x79 of A573 Grade 60 (Fy = 415 MPa) steel is used as a compression member.  It is 6.8 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 critical slenderness ratio with respect to weak axis buckling using theoretical value of k.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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A W12x79 of A573 Grade 60 (Fy = 415 MPa) steel is used as a compression member.  It is 6.8 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 critical slenderness ratio with respect to weak axis buckling using theoretical value of k.

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