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Q19. A Rectangular concrete beam 300 wide by 400 mm deep is prestressed by a force of 660 kN at a constant eccentricity of 70 mm. The beam supports a concentrated load of 75 kN at the centre of the span of 5m. Determine the location of the pressure line at the centre, quarter span and support sections of the beam. Density of the concrete is 24 kN/m'. 16)