A pair of loads \(P\) acts on a portal frame as shown in the figure 3.37. The length of all members is equal to \(1 \mathrm{~m}\), flexural rigidity \(E I=1,000 \mathrm{Nm}^{2}\), and the axial rigidity \(E A=\) \(10^{9} \mathrm{~N}\). Determine the critical values of \(P\) for buckling of the frame. Sketch the predicted buckled shape of the frame

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2 P 2 P (3) 1 3 Figure 3.37 A portal frame subjected to two axial forces 4