The three bars are made of steel and form a pin-connected truss. Each bar has a cross sectional area of 3 in^2. Use Est = 29x10^6 psi. If the truss was constructed at 50 F and is heated to 110 F, coefficient of thermal expansion of steel = 6.6x10^-6 ft/ft F. Determine the following: a) Force in bar AD (kip) b) Force in bar AB (kip)

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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.