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Problem with modal analysis

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Message 1 of 3
Anonymous
443 Views, 2 Replies

Problem with modal analysis

Hi, I'm new to this forum, and I have unusual problem.

 

Results of modal analysis in the same model, I only changed the number of modes.

How is this even possible? 

 

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Message 2 of 3
Simau
in reply to: Anonymous

@Anonymous 

Indeed it's not normal.

Could you share your model

M. Agayr
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Message 3 of 3
Anonymous
in reply to: Simau

When I close and reopen model, it's fine, same result for 10, and 30 modes.

Strange, but OK.

 

But, I'm new in RSA, and have a lot of questions. 🙂

First is about parameters of foundation elasticity. What's the best solution for concrete foundation plate in RSA?

 

- define Kz, Kx, Ky

- define Kz and elastic support (Ux, Uy fixed) on plate edges 

- define Kz and set a rigid suport (Ux, Uy fixed) on corners

- some other solution

 

 

 

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