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Which of the following statements is FALSE about the moment distribution method?

  • A.The moment distribution method of analysis is applicable to beams and frames.
  • B.It is an approximate method.
  • C.The degree of accuracy of results depends on the number of successive approximations.
  • D.The moment distribution method is not suited for plane rigid frames.

Answer: D

It is false that the moment distribution method is not suited for plane rigid frames. The method is applicable to continuous beams and to plane frames, including rigid-jointed ones, which is what Hardy Cross devised it for. It is an approximate (iterative) method, since the fixed-end moments are distributed and carried over repeatedly, and the accuracy depends on how many successive cycles are carried out. The first three statements are therefore true.

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