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The percentage loss of prestress due to anchorage slip of 3 mm in a concrete beam of length 30 m which is post-tensioned by a tendon with an initial stress of 1200 N/mm2 and modulus of elasticity equal to 2.1 × 105 N/mm2 is
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- 0.0175
- 0.175
- 1.75
- 17.5
Correct Option: C
| Strain = | = | 1 × 10-4 | ||
| l | 30 × 103 |
Strain loss = strain × Ec
= 1 × 10-4 × 2.1 × 105 =
21 N/mm2
| % loss = | × 100= 1.75% | |
| 1200 |
