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Steel jacketing of a column improves its behaviour chiefly by

  • A.adding a great deal of flexural strength about both axes of the column
  • B.reducing the axial load that the column is required to carry from above
  • C.lengthening the natural period of the building in which the column stands
  • D.confining the concrete core

Answer: D

A steel shell acts in hoop tension in place of the missing ties, letting the core sustain much larger strain. Because it adds little flexural capacity, it improves ductility without disturbing the capacity hierarchy at the joints.

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