A prestressed concrete beam of rectangular section, 120 mm wide and 300 mm deep, spans over 6 m. The beam is prestressed by a straight cable carrying an effective force of 180 kN at an eccentricity of 500 mm. If it supports an imposed load of 4 kN/m and the modulus of elasticity of concrete is 38 kN/mm², compute the deflection at the following stages and check whether they comply with the IS code specifications. (a) upward deflection under (prestress + self-weight), and (b) final downward deflection under (prestress + self-weight + imposed load) including the effects of creep and shrinkage. Assume the creep coefficient to be

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