Instability type 1&2 RZ RC columns

[Franco.dipietro]

Hi

I have this RC model with shear walls and portal frames for lateral stability.

I have a lot of instability problems with the other released columns in RZ

I have attached the model.

http://www.filemail.com/d/cpeexqgjvwjiwiy

Thanks

[Artur.Kosakowski · Accepted solution]

You should not do that as they will rotate about their axes. Mind that you also released this d.o.f applying the releases at the top nodes of the columns. In addition I would suggest rempving releases from free ends of beams (nodes 15 and 34).

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