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Strengthening an existing beam-column joint is difficult chiefly because

  • A.the joint is enclosed by the members framing into it
  • B.the joint carries no force and there is nothing to be gained by strengthening it
  • C.joints in older buildings already contain more transverse steel than is required
  • D.the concrete in a joint is invariably of a much higher grade than in the members

Answer: A

Beams arrive on up to four faces and the slab covers the top, so there is very little surface to work on. Steel collars, fibre wrapping around the accessible faces and haunches added beneath the beams are the measures normally available.

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