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Discussion

Boundary conditions in a structural model should be chosen to

  • A.Match the number of applied loads
  • B.Represent the real restraint, no more
  • C.Fix as many degrees of freedom as possible
  • D.Leave the model completely free

Answer: B

Over-constraining stiffens the model and attracts artificial load into the supports, while under-constraining leaves it free to move as a rigid body. Both errors are common, and the reaction forces are a useful check that the restraint is behaving as intended.

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