A rectangular concrete beam of cross-section 30cm deep and 20cm wide is prestressed by means of 15 wires of 5mm diameter located 6.5cm from the bottom of the beam and 3 wires of diameter 5mm, 2.5cm from top. Assuming the prestressed in the steel as 840N/mm^2, calculate the stresses in N/mm^2 at the extreme fibers of the mid-span section when the beam is supporting its own weight over a span of 6m. If uniformly distributed live load of 6kN/m is imposed, evaluate

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Properties of materials

A property of a material describes its characteristics and distinguishes it from the others. The material properties are described it in terms of its hardness, color, appearances, and so on. The material properties generally depend on the type of material, or whether it is a metal or an alloy. There are different kinds of material properties such as mechanical properties, thermal properties, physical properties, and chemical properties. Chemical properties describe the material in terms of a chemical change. The mechanical properties come into existence when the material is acted upon by an external load. Thermal properties are associated with the temperature of the material and specific heat.