A concrete beam is post-tensioned by a cable carrying an initial stress of 1000 N/mm2. The slip at the jacking end was observed to be 5 mm. The modulus of elasticity of steel is 210 kN/mm2. What is the percentage loss of stress due to anchorage slip if the length of the beam is 30 m ?
1
3.5%
2
35%
3
0.35%
4
30.5%