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A structure is described as effectively rigid in an idealisation when

  • A.It carries no load
  • B.It has been removed from the model
  • C.Its deformation is negligible
  • D.It is made of steel

Answer: C

Treating a very stiff component as rigid removes degrees of freedom without materially changing the answer, and it simplifies both hand analysis and finite element models. The judgement is relative: rigid against what, and for which quantity of interest.

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