A prestressed concrete beam has a width of 250 mm and an overall depth of 500 mm. Prestressing bars are placed at a distance e below the centroidal axis of the beam and a prestressing force of P is applied on it. Assume a prestress loss of 25%.
1. Calculate the value of P when the compressive stress in the entire section is 18 MPa.
2. Calculate the value of P when the compressive stress at the bottom fiber is 10 MPa and the tensile stress at the top fiber is 3MPa.
3. Calculate the value of P when the compressive stress at the bottom fiber is 16 MPa and the stress at the top fiber is 0 MPa.

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To solve the given problems well use the principles of prestressed concrete and equilibrium conditions Lets address each question separately Calculate ... View the full answer