The steel bar AB of the frame is assumed to be pin connected at its ends for \(y-y\) axis buckling. If \(P=18 \mathrm{kN}\), determine the factor of safety with respect to buckling. Take \(E_{\mathrm{st}}=200 \mathrm{GPa}\), \(\sigma_{Y}=360 \mathrm{MPa}\).

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3m-A P 4 m PC B 6 m x- 50 mm -x 50 mm-50 mm