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Static condensation in dynamic analysis is used to

  • A.convert a dynamic problem into a purely static one throughout
  • B.remove the damping matrix from the equations of motion
  • C.eliminate degrees of freedom that carry no mass
  • D.add extra degrees of freedom to improve the accuracy of the model

Answer: C

Rotational degrees of freedom at joints often carry negligible mass, and condensing them out shrinks the eigenvalue problem without material loss of accuracy. The stiffness contribution of those degrees of freedom is retained in the condensed matrix.

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