Loads are applied with rigid bearing plates to a system of steel bars,  as shown in the figure. The cross-sectional areas are 18in2 for bar AB,  5in2 for bar BC, and 14in2 for bar CD. Determine the normal stress on a  typical cross section in each of the bars.

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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.