Question

At the time of initial tensioning, the maximum tensile stress in tendon immediately behind the anchorage shall NOT exceed

• A. 50% of the ultimate tensile strength of the wire or bar or strand
• B. 80% of the ultimate tensile strength of the wire or bar or strand
• C. 40% of the ultimate tensile strength of the wire or bar or strand
• D. 60% of the ultimate tensile strength of the wire or bar or strand

Answer 1

The correct option is B 80% of the ultimate tensile strength of the wire or bar or strand

As per IS 1343 : 1980 (clause 18.5.1) the maximum tensile stress $f_{pi}$ immediately behind the anchorage shall not exceed 80 percent of ultimate tensile strength of wire or bar or strand at the time of initial tensioning.