Multiple choice

A concrete beam presented with a parabolic tendon is shown in the sketch. The eccentricity of the tendon is measured from the centroid of the cross - section. The applied prestressing force at service is 1620 kN. The uniformly distributed load of 45 kN/m includes the self weight. The stress in (N/mm2) in the bottom fibre at mid - span is

  1. tensile 2.90

  2. compressive 2.90

  3. tensile 4.32

  4. compressive 4.32
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B Correct answer

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