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Two idealisations of the same structure giving different answers indicates

  • A.That the applied loads are wrong
  • B.One has discarded something that matters
  • C.That the structure is unsafe
  • D.That the material properties are wrong

Answer: B

Correct answer: One has discarded something that matters

Idealisation is the deliberate discarding of what does not matter, so a disagreement means one of the two models has thrown away something that does. The loads and material properties are inputs common to both and are not the explanation. The useful response is to identify what the two treat differently - a load path retained in one and omitted in the other - rather than to prefer the answer that looks better.

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