6) Given the following frame system, the Euler's critical load for the structure is (plot the deflected structure on the booklet): 7) 8) P O EJ-∞ h EJ-00 2h π' ΕΙ π² EJ π² EJ a) P = with =0.7h; b) P = with l=h; c) P with lo=2h. In the Saint-Venant's case of BIAXIAL FLEXURE, the neutral axis: a) is never a line parallel to the principal axes; b) is a line parallel to x-axis; c) is a line parallel to y-axis. A thin-walled cross-section under PURE SHEAR is characterized in general by: a) shear stress components Tx, Tzy varying linearly along the thickness of the cross-section and no σ₂ in any of its points; b) shear stress components Tzx, Tzy constant along the thickness of the cross-section and σ; c) shear stress components Tzx, Tzy constant along the thickness of the cross-section and no σ₂ in any of its points.

6) Given the following frame system, the Euler's critical load for the structure is (plot the deflected structure on the booklet): 7) 8) P O EJ-∞ h EJ-00 2h π' ΕΙ π² EJ π² EJ a) P = with =0.7h; b) P = with l=h; c) P with lo=2h. In the Saint-Venant's case of BIAXIAL FLEXURE, the neutral axis: a) is never a line parallel to the principal axes; b) is a line parallel to x-axis; c) is a line parallel to y-axis. A thin-walled cross-section under PURE SHEAR is characterized in general by: a) shear stress components Tx, Tzy varying linearly along the thickness of the cross-section and no σ₂ in any of its points; b) shear stress components Tzx, Tzy constant along the thickness of the cross-section and σ; c) shear stress components Tzx, Tzy constant along the thickness of the cross-section and no σ₂ in any of its points.