A reinforced concrete column 8 in. in diameter is designed to carry an axial compressive load of 62.3 kips. Determine the required area of the reinforcing steel if the allowable stresses are 870 psi and 17,404 psi for the concrete and steel, respectively. Use Eco = 2.03 x10^6 and Est = 29 x10^6 psi.

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.