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An idealised model should always be checked by

  • A.Running it a second time unchanged
  • B.Comparing it with a model of a different structure
  • C.Verifying that the reactions equilibrate the applied loads
  • D.Assuming the software is correct

Answer: C

Summing the reactions and comparing them with the applied load is the cheapest and most revealing check available, and it catches misapplied loads, wrong units and unintended restraints. Deformed shape plots and simple hand calculations are the natural companions to it.

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