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Reinforced Cement Concrete

Types of Pre-Stressing

In pre-tensio...

Question

In pre-tensioned beams, which of the following losses is/are not considered?
1. Anchor loss 2. Shrinkage
3. Creep 4. Relaxation
5. Friction 6. Elastic shortening
Select the correct answer using the codes given below:

A

1,2 and 3 only

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B

4,5 and 6 only

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C

5 only

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D

6 only

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Solution

The correct option is C 5 only
In strict terms two types of losses are not considered in pretensioned beams viz. loss due to friction and loss due to anchorage slip. Here the most close option is (c).

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Similar questions

(A):

Losses in prestress in pre-tensioned beams are more than the losses in post-tensioned beams.

(R):

This is partially due to the effect of elastic shortening.

Q. Mathc List -I with List - II and select the correct answer using the codes given below the lists:
List-I
A. Loss of prestress
B. End block
C. Transmission length
D. Partially pre-stressed

List - II
1. Class 3
2 Pretensioned members
3. Bursting tension
4. Elastic structures shortening

Codes:

A B C D

Q. In a pre - tensioned beam, the ultimate shrinkage strain and ultimate creep coefficient are

250 \times 10^{- 6}

and 1.6 respectively. Given

E_{s}

E_{c}

are 210 GPa and 35 GPa, respectively. The stress in concrete at the level of steel, considering loss due to creep as two times the loss due to shrinkage, is equal to ________

N / m m^{2}

.

Q. The losses in prestress in pre-tensioning system are due toSelect the correct answer using the codes given below:

1,2 and 3
2 and 3
1 alone
3 alone

Assertion (A):

Losses in prestress of pretensioned beam are more than the losses in post-tensioned beam.

Reason (R) :

This is partially due to the effect of elastic shortening.

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