The 'post-tensioning' system requires anchor components to transfer force to concrete because:
Choose the correct answer
Tendons directly bonded to concrete throughout (no anchors needed)
Tendon stressed against hardened concrete using wedge/nut anchors bearing on anchor plate — force locked in by anchor
Only gravity holds tendons in place
Welding tendons to reinforcement cage
Correct Answer
B. Tendon stressed against hardened concrete using wedge/nut anchors bearing on anchor plate — force locked in by anchor
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Post-tensioning: tendons (in ducts) stressed after concrete hardening using hydraulic jacks bearing on concrete end face. Force transferred: (1) Friction (along curved tendon path); (2) Bearing (wedge anchors press on anchor plate which bears on concrete). Anchor integrity critical — all prestress locked in by anchor. Loss: anchorage slip (1–5 mm draw-in). IS 1343 covers details; IS 6003 for duct; IS 1785 for wire.
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