Question

1. explain the differences between reinforcing and prestressing and the relative advantages and disadvantages of each
2. under what circumstances would you use pretensioning, and under what circumstance would you use posttensioning?

Answer 1

Differences between reinforcing and prestressing and the relative advantages and disadvantages of each

1.Comment why reinforcement is provided in concrete structures. which type stress (tension or compression) will it take up.

2.state pressed concrete will induce what type of stress.

3. comment about what type of reinforcement bars/ tendons are used in both

4. state about improvement in concrete against loading about loads.(high or slight)

5.state about the method of application of steel(before or after application of loading.)

6.State about the method of casting(factory or cast in situ)

7. state about workmanship required.

8.state about quilty control.

adv of prestressing,

1.comment about cracking under working load.

2.comment about the weight of member.

3.comment about material saving.

4.comment about stiffenes under working load.

6.comment about durabilty.

7.comment about suitability for precast construction.

dis adavntges.

1.comment about labour requirements.

2.comment about the strength of material required.

3. comment about the additional cost of equipment.

4.comment about the need of quality control.

circumstances would you use pretensioning, and under what circumstance would you use posttensioning

1. comment about section properties.(small section suits pre-tensioning)

2.comment about the weight of member required. (heavy suits post-tensioning.)

3.comment about the number of elements required at large. bulk production suit pre-tensioning.