Question

As per IS 1343, at the time of initial tensioning, the maximum tensile stress immediately behind the anchorages shall be limited to p percent of the ultimate tensile strength of the wire, wherein p is
1. 85
2. 67
3. 50
4. 76
5. 75

Answer 1

Correct Answer - Option 4 : 76

Explanation:

• 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 safer side)

•  Grade of concrete:
  • M40 for pre-tensioned members
  • M30 for post-tensioned members