Prestressed Concrete Structures Practice Test 3

1. A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (E_s = 210kn/mm²) jacked at 4 points and 90 degrees apart. Find the expected extension at the jack?

2. Which one of the following is the Indian standard regarded to the limit state of deflection?

3. Which of the following Indian standard code is recommended for the loss of prestress due to shrinkage?

4. The amount of anchorage slip generally depends upon __________

5. The large deflections under dynamic effects may cause ____________

6. The loss of stress due to creep of concrete can be estimated by ___________

7. The additional long term deflection resulting from creep and shrinkage of flexural members is determined by multiplying the deflection caused by __________

8. The creep curvature due to prestress is obtained on the simplified assumption that creep is induced by the average prestress acting over the given time is according to __________

9. A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm² is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?

10. The differential shrinkage between the interior and surface of large members result in ___________