Q4. A prestressed concrete beam supports a live load of 8+(888/600) kN/m over a simply supported span of 6 m. The beam has an I-section with an overall depth of 500 mm, width of the flange is 250 mm and thickness of flange and web as 50 mm. The beam is to be prestressed by an effective presstressing force of 700 kN at an eccentricity of 60 mm with a parabolic profile cable. The modulus of elasticity of concrete is 37 kN/mm2 . Estimate the instantaneous deflection of the slab at Centre of span under prestress and the imposed loads