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Discussion

Consider the following statements about jacketing.

1. A concrete jacket adds confinement and flexural strength.

2. A steel jacket adds confinement with little flexural strength.

3. Fibre wrapping adds a great deal of mass.

Which are correct?

  • A.1, 2 and 3
  • B.2 and 3 only
  • C.1 and 3 only
  • D.1 and 2 only

Answer: D

The first two describe the two methods correctly, and the distinction matters because adding flexural strength to a column can disturb the capacity hierarchy. Fibre wrapping is a few millimetres thick and adds essentially no mass.

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