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Consider the following factors
1. initial prestress
2. losses in prestress
3. depth of cable from extreme compression fibre
Those which affect the ultimate moment capacity of a prestressed concrete beam would include
  • a)
    1 and 2
  • b)
    1 and 3
  • c)
    1 alone
  • d)
    3 alone
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following factors1. initial prestress2. losses in prestre...
Factors affecting ultimate moment capacity of a prestressed concrete beam:

1. Depth of cable from extreme compression fibre
- This factor refers to the distance between the centroid of the prestressing steel and the extreme compression fibre. The greater the depth of the cable from the extreme compression fibre, the higher the moment capacity of the beam.

2. Initial Prestress
- The initial prestress is the level of stress induced in the prestressing steel before the application of any external load. The higher the initial prestress, the higher the ultimate moment capacity of the beam.

3. Losses in Prestress
- Prestressing steel may lose some of its initial prestress due to various reasons such as creep, shrinkage, relaxation, and anchorage slip. The greater the losses in prestress, the lower the ultimate moment capacity of the beam.

Therefore, option D, 3 alone, is the correct answer as only the depth of cable from extreme compression fibre affects the ultimate moment capacity of a prestressed concrete beam.
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Consider the following factors1. initial prestress2. losses in prestress3. depth of cable from extreme compression fibreThose which affect the ultimate moment capacity of a prestressed concrete beam would includea)1 and 2b)1 and 3c)1 aloned)3 aloneCorrect answer is option 'D'. Can you explain this answer?
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