For modal analysis the participation mass is 0%

[Anonymous]

Hi, I'm working on a model of a building for which I have a spectral analysis for seismic loads. When I run the analysis and go to advanced results for modal analysis the participation mass is 0%. I tried running the analysis with more modes but it still gives the same result. Please advise on the topic, I have attached the model in case it helps. Thanks.

 @Anonymous  Artur Kosakowski edited the topic for better findability 

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

As you modeled the slabs as diaphragms I'd consider excluding the vertical vibrations from the equation.

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