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Reinforced Cement Concrete

Slip Loss and Relaxation of Steel

A simply supp...

Question

A simply supported prestressed concrete beam is of 25 m span. The initial stress is 1000 MPa.
The slip in the jack during tensioning has been 2 mm, If $E_{s} = 200 G P a,$ the loss prestress due to anchorage slip is

A

16%

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B

12%

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C

10%

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D

1.6%

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Solution

The correct option is D 1.6%
$\begin{matrix} L & = 25000 m m p_{0} & = 1000 N / m m^{2} S l i p & = 2 m m L o s s & = \frac{δ l}{l} \times E_{s} = \frac{2}{25000} \times 200 \times 10^{3} = 16 N / m m^{2} % l o s s & = \frac{16}{1000} \times 100 = 1.6 % \end{matrix}$

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