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I have a problem with some instabilities (type 2) in a design of an industrial shed. More spesicifally, when I use the "Calculations" button, a type 2 instability appear for each truss beam in the shed (there are totally 13 truss beams). I have attached a design of this shed with only 2 truss beams. If I change some bar releases from pinned to fixed, there are no instabilities, but I can't understand why, since it seems to me that there is no mechanism in the structure. I need some help..
I would like to thank you for your help, but I would appreciate an explanation about the instability that occured. I can't understand why there was any instability, since the nodes that appeared to have problem, were located on a rigid bar, and not at the ends of it. Thanks again for your time
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")