Question:medium
Which one of the following is categorized as a long-term loss of pre-stress in a pre-stressed concrete member?
Which one of the following is categorized as a long-term loss of pre-stress in a pre-stressed concrete member?
Show Hint
Prestress losses:
\[
\boxed{
\begin{aligned}
\text{Immediate} &: \text{Elastic shortening, Friction, Anchorage slip}\\
\text{Long-term} &: \text{Creep, Shrinkage, Relaxation}
\end{aligned}
}
\]
Updated On: Jul 23, 2026
- Loss due to elastic shortening
- Loss due to friction
- Loss due to relaxation of strands
- Loss due to anchorage slip
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Sorting the losses by when they occur.
Elastic shortening, friction and anchorage slip all happen essentially the moment the strands are stressed and released, so they are grouped as immediate losses.
Step 2: What is left for the long term.
Shrinkage of concrete, creep of concrete and relaxation of the prestressing steel all continue to develop slowly over months and years after transfer, so these three are the long term losses.
Step 3: Matching to the given options.
Of the choices offered, elastic shortening, friction and anchorage slip are all immediate losses, leaving relaxation of strands as the only long term loss in the list.
\[ \boxed{\text{Loss due to relaxation of strands}} \]
Elastic shortening, friction and anchorage slip all happen essentially the moment the strands are stressed and released, so they are grouped as immediate losses.
Step 2: What is left for the long term.
Shrinkage of concrete, creep of concrete and relaxation of the prestressing steel all continue to develop slowly over months and years after transfer, so these three are the long term losses.
Step 3: Matching to the given options.
Of the choices offered, elastic shortening, friction and anchorage slip are all immediate losses, leaving relaxation of strands as the only long term loss in the list.
\[ \boxed{\text{Loss due to relaxation of strands}} \]
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