1. A long steel column is simply supported as shown in the figure below. The column is a rectangular hollow section with wall thickness of 12 mm. Determine the buckling load, P for the column based on Euler buckling if the modulus of elasticity, E, is 205 000 MPa. 5 m K P y 300 mm X 200 mm

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Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.