Design of RCC Columns as per IS 456:2000 || CIVIL Design

R.C.C. Design (As Per IS : 456-2000) * Concrete is good in resisting compressive stress but is very weak in resisting tensile stress. Hence, concrete structure is reinforced with steel wherever tension develops. Steel is the best reinforcement since its tensile strength is quite high and the bond between steel and concrete is excellent. * Characteristic strength of concrete is defined as the compressive strength of 150 mm concrete cubes at 28 days in N/mm2 , below which not more than 5 per cent cubes give the result. Table 7.1 gives grades of concrete. Nowadays ultra high strength concrete of M 500 are also produced in the laboratories and M 250 concrete has been used in bridge construction. * Minimum grade of concrete for different exposure with normal weight aggregates of 20 mm nominal maximum size are as shown below: Mild – M : 20 Moderate M 25 Severe – M : 30 Very severe M 35 Extreme – M : 40 * Tensile strength: A designer may use the following expression for finding flexural tensi...