Question

The stress block in concrete for an estimate of ultimate strength in flexure of a prestressed beam

• A. should be parabolic
• B. should be parabolic-rectangular
• C. should be rectangular
• D. may be of any shape which provides agreement with the test data

Answer 1

The correct option is D may be of any shape which provides agreement with the test data

As per IS 1343 : 1980, the method for computing flexural strength of a prestressed beam states that stress block may be of any shape which provides agreement with test data.