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At the time of initial tensioning, the maximum tensile stress fpi immediately behind the anchorage shall not exceed ______ of the ultimate tensile strength fpu of the wire of bar or stand.

1. 55%
2. 69%
3. 76%
4. 85%

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Correct Answer - Option 3 : 76%


  • As per CI. 18.5.1 of IS 1343 at the time of initial tensing, the maximum tensile stress immediately behind the anchorages shall not exceed 80% of the ultimate tensile strength of wire or bar or strand.

As per the given option, we should take 76% (for the safer side)

  •  Grade of concrete:
    • M 40 for pre-tensioned members
    • M 30 for post-tensioned members

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