Prestressed Concrete Structures Mock Test 3

1. The deformation of prestressed members change with time as a result of __________

2. The loss of stress due to anchorage slip of anchorages is given as __________

3. The deflection of a beam with parabolic tendon is given as __________

4. The British code for structural concrete recommends design values of ultimate creep strain of pretensioning is ___________

5. The loss of stress in steel due to creep of concrete is ___________

6. The loss of prestress due to friction generally occurs in case of ____________

7. A prestressed concrete beam, 200mm wide and 300mm deep is prestressed with wires (area is 320mm²) located at a constant eccentricity of 50mm, initial stress of 1000n/mm², span is 10m. Calculate loss of stress due to friction and slip anchorage of post tensioned beam?(E_s = 210kn/mm², E_c = 35kn/mm²).

8. Which of the following person made attributions to evaluate the curvature under simplified assumptions?

9. In post cracking stage, the behavior of the beam is similar to __________

10. 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?