The compound bar ABCD has a uniform cross-sectional area of 0.25. When the axial force P is applied, the length of the bar is reduced by 0.018. Determine the magnitude of the force P. The moduli of elasticity are 29x106 psi steel and 10x106 for aluminum.

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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.