An unsymmetrical I section has an overall depth of 2000 mm. The top flange width and depth are equal to 1200 mm and 300 mm respectively, and the bottom flange width and depth are equal to 750 mm and 200 mm respectively. The thickness of the web is 300 mm. the tendons have a cross sectional area of 7000 mm2 and located 200 mm from the bottom. If the ultimate compressive strength and tensile strength of steel are 42 MPa and 1750 MPa, respectively and the tendons are effectively bonded to concrete. Estimate the flexural strength of the cross section.

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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.