Equivalent Seismic Force Method-Pseudo Forces

[TuanNguyen2014]

I have a simple model with seismic analysis using Equivalent Seismic Force Method.

Mass source is only selft weight of structure (double).

However, Pseudo Lateral force is extremely high as marked in red circle.

I do not understand how this load is generated and it seems that I am having something wrong in my model.

[TuanNguyen2014]

Just deleted these 02 frames which high Pseudo forces happen and re-defined new ones. Problem was solved.

Actually, I do not know what was wrong in the definition of such frames.

[Rafal.Gaweda]

Define maybe only 4 stories as shown below:

[t.sautierr]

It has to do with you floor definition I think, suppress all the stories and define only one at 9.75m and watch 🙂

As you have got a slope maybe some more floors are required I don't know well the ASCE simplified method.