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Fibre-reinforced polymer wrapping is applied to a column with the fibres oriented

  • A.circumferentially, to confine the core
  • B.longitudinally, to add as much flexural strength to the column as possible
  • C.diagonally at forty-five degrees, to resist the axial load more efficiently
  • D.randomly, since the direction of the fibres makes no difference to the result

Answer: A

Hoop-wise fibres restrain the lateral expansion of the concrete and so raise its strain capacity, which is the deficiency in an unconfined column. Longitudinal fibres are added only where flexural strengthening is deliberately wanted.

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