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Symmetry in application of boundary conditions should be avoided in which of the following type of analysis?

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Symmetry in application of boundary conditions should be avoided in which of the following type of analysis?

(a) Linear static analysis

(b) Modal analysis

(c) Thermal analysis

(d) Nonlinear static analysis

I have been asked this question by my school principal while I was bunking the class.

My question is from Beams and Frames in division Beams and Frames of Finite Element Method

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Correct answer is (b) Modal analysis

The explanation: Symmetric boundary conditions should not be used for modal analysis. Symmetric model would miss some of the modes of modal analysis or out of phase modes.

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