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I'm trying to find the modal frequencies of a pin-jointed frames, to validate an ansys model.

So far I've used direct stiffness method to generate a global stiffness matrix for the framework in Matlab. Is it as simple as mutiplying the stiffness matrix with an inverted mass matrix and finding the eigenvalues?

My gut geeling tells me I'm missing a step. Any help would be great.

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# Modal analysis of a pin-jointed frameworks

**Physics Forums | Science Articles, Homework Help, Discussion**