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Strong beams and weak columns in an existing frame indicate

  • A.that the building has an unusually large reserve of strength against collapse
  • B.that the foundations will fail before any part of the superstructure is damaged
  • C.a risk of a storey mechanism forming
  • D.a well-detailed frame in which the beams will hinge before the columns do

Answer: C

Hinges will form in the columns rather than the beams, and hinges at the top and bottom of one storey's columns leave nothing holding the building up. Reversing the hierarchy by strengthening the columns is a standard retrofit objective.

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