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Tendons

3 tendons nam...

Question

3 tendons namely I, II and III each are tensioned simultaneously in a post tensioned beam. All tendons are located at the same height from the soffit of the beam. The amount of loss due to elastic shortening of tendons is:

A

I > I I > I I I

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B

I < I I < I I I

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C

I = I I = I I I

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D

Zero

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Solution

The correct option is D Zero
In post-tensioned member, the loss due to elastic shortening is zero in all the tendons when the tendons are tensioned simultaneously.

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Similar questions

Q. A pre-tensioned rectangular beam 150 mm wide and 300 mm depth is prestressed with three straight tendons each having a cross-sectional area of 50 mm

^{2}

to an initial stress of 1200 N/mm

^{2}

. The tendons are located at 100 mm from the soffit of the beam. If the modular ratio is 6 the loss of prestressing force (in kN upto one decimal place) due to the elastic deformation of concrete is ______.

(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.

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.

Q. The percentage loss of prestress due to anchorage slip of 3 mm in a concrete beam of length 30 m which is post-tensioned by a tendon with an initial stress of

1200 N / m m^{2}

and modulus of elasticity equal to

2.1 \times 10^{5} N / m m^{2},

Q. The percentage loss of pre-stress due to anchorage slip of 3 mm in a concrete beam of length 30 m, which is post-tensioned by a tendon with an initial stress of 1200 N/mm

^{2}

and modulus of elasticity equal to 2.1 x 10

^{5}

^{2}

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