https://forums.autodesk.com/t5/robot-structural-analysis-forum/instability-type-1/m-p/8119908#M31217 <P>I have modeled a 18 storey building before i run seismic analysis there were no errors or warnings. after including seismic analysis i started getting instability type 1 at various nodes. Is there any way i can solve this issue. any help will be deeply appreciated.</P> Tue, 10 Jul 2018 09:08:33 GMT Anonymous 2018-07-10T09:08:33Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/instability-type-1/m-p/8119908#M31217 <P>I have modeled a 18 storey building before i run seismic analysis there were no errors or warnings. after including seismic analysis i started getting instability type 1 at various nodes. Is there any way i can solve this issue. any help will be deeply appreciated.</P> Tue, 10 Jul 2018 09:08:33 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/instability-type-1/m-p/8119908#M31217 Anonymous 2018-07-10T09:08:33Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/instability-type-1/m-p/8120004#M31218 <P>The model has been attached.</P> Tue, 10 Jul 2018 09:35:01 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/instability-type-1/m-p/8120004#M31218 Anonymous 2018-07-10T09:35:01Z