A concrete beam of effective span 20 m, is post–tensioned by a cable at one end, which is concentric at supports A and B and with a constant eccentricity of 400 mm towards the tension zone for a length of 10 m in the mid span and has a parabolic in the remaining 5 m near each of supports. Ignoring the curvature affect then the loss of prestressing force due to friction is ________ kN. Area of tendon is 200 mm2 and the initial prestress is 1200 MPa. (Take μ =0.25, K = 0.002/m)
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