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A storey mechanism, in which hinges form at the top and bottom of every column in one storey, is undesirable because

  • A.it produces no deformation at all and therefore dissipates no energy
  • B.it can only occur in buildings founded on rock rather than soil
  • C.the whole deformation demand concentrates in that single storey
  • D.it distributes the demand too evenly over the height of the building

Answer: C

With every column of a storey hinged, that level must accommodate the entire drift while the storeys above ride along as a rigid block. The demand on those few columns quickly exceeds what they can sustain, which is why capacity design goes to such lengths to avoid the mechanism.

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