Instability of nodes Type 2

[Delvin.Ramassami]

Dear All,

I am having a shed with the following loading

a) Dead load of structure

b) Wind Load +X direction

C) Wind Load +Y direction

The query is that while automatic calculation is done the following notice appear

Any reason why ? (snap ROBOT INSTA )

What does instability Type 2 means ?

But still when member verification is done everything is correct . ( snap ROBOT INSTA 2)

Thanks

[Rafal.Gaweda]

From help:

http://docs.autodesk.com/RSA/2012/ENU/filesROBOT/GUID-52C292E1-5C73-4FB1-B4E0-E5E8107777D-615.htm

In case of instabilities type 1 and 2 resultys are wrong.

If you want us check your model please send it.

[Delvin.Ramassami]

think problem is with release ??

[Rafal.Gaweda]

There is no instability in this model.

Have you sent correct model?

[Delvin.Ramassami]

sorry this one is the correct one

[Rafal.Gaweda]

Either remove releases on columns from the side of pinned supports or assing fixed supports there