Pre-stressed concrete loses prestress due to 'immediate losses' occurring at the time of transfer. These include:
Choose the correct answer
Creep and shrinkage (these are long-term losses)
Elastic shortening + friction + anchorage slip — all occur at or during transfer/stressing
Only relaxation of prestressing steel
No loss at time of transfer
Correct Answer
B. Elastic shortening + friction + anchorage slip — all occur at or during transfer/stressing
Why is this the answer?
Immediate (short-term) PSC losses: (1) Elastic shortening of concrete (pre-tensioning: concrete shortens when wire released; post-tensioning: if sequential stressing); (2) Friction losses (post-tensioning only — wobble + curvature); (3) Anchorage slip/draw-in (post-tensioning: wedge seating = 1–5 mm slip). Time-dependent losses (long-term): creep, shrinkage, relaxation of steel.
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