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Discussion

Damping in a structure arises chiefly from

  • A.the natural period of the structure being long
  • B.friction, cracking and other internal energy dissipation
  • C.the elastic stiffness of the structural members themselves
  • D.the weight of the structure acting through its supports

Answer: B

Micro-cracking, friction at joints and interaction with non-structural elements all remove energy, and the viscous model is a convenient idealisation of the total. It is not a property that can be computed from the geometry alone.

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