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Hello STKO team, I wanted to know how I could model a floor with wooden beams and planking, since I tried to model it with beams alone and obtained local modes in the beams and did not obtain a global mode as required in the analysis, because my objective is to analyze the global behavior of the building. I am attaching a photograph of the modes obtained and also the model file. Thank you all in advance.

If you don't want to include the floor-beams' modes, don't assign distribtued masses on them.
Instead, compute the total mass of the beam, an apply one-half of it on each end-node of the beam.
In this way you are transfering the mass of the beam to the surrounding walls