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The strong-column weak-beam principle requires that, at a joint, the sum of the column moment capacities be

  • A.unrelated to the beam capacities
  • B.greater than the sum of the beam moment capacities
  • C.smaller than the sum of the beam moment capacities so that columns yield first
  • D.exactly equal to the sum of the beam moment capacities at every joint

Answer: B

Hinges in beams produce a distributed mechanism that can absorb a great deal of energy, while hinges in columns produce a storey mechanism that can collapse the building. Making the columns stronger than the beams framing into them is how the desirable mechanism is forced.

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