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Question

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/mm2 and modulus of elasticity equal to 2.1×105 N/mm2, is

A
0.0175
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B
0.175
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C
1.75
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D
17.5
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Solution

The correct option is C 1.75
Loss of prestress
=Δll×Eb=330×103×2.1×105=21 N/mm2
Initial stress =1200 N/mm2
Loss of prestress =211200×100=1.75%

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