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A beam-sway mechanism is preferred to a column-sway mechanism because it

  • A.concentrates the energy dissipation into a small number of critical members
  • B.avoids any inelastic deformation anywhere in the structure at all
  • C.requires no ductile detailing to be provided in the beams themselves
  • D.spreads the energy dissipation over many hinges throughout the frame

Answer: D

Many hinges, each rotating moderately, absorb far more energy in total than a few hinges rotating severely, and no single failure brings the frame down. This is why codes reward frames detailed to yield in their beams with the highest response reduction factors.

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