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Beam-column joints in older buildings are frequently deficient because

  • A.they were cast separately from the members and are therefore of higher grade concrete
  • B.they contain no transverse reinforcement at all
  • C.they contain far more transverse reinforcement than the current standard requires
  • D.the beams framing into them are invariably stronger than the columns above and below

Answer: B

Detailing practice before ductile codes simply stopped the column hoops at the beam soffit, leaving the joint unconfined. Because the joint carries the full capacity of the members framing into it, that omission is often the governing deficiency.

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