A prestressed concrete beam is 250 mm wide by 500 mm deep with a simple span of 6 m. The beams are pretensioned with a prestressing force of 650 kN at an eccentricity of 100 mm. Loads on the beam: Total Dead Load = 6 kN/m Live Load = 8 kN/m Compute the stress at the bottom fibers of the beam at midspan due to initial prestressing force alone.

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