DLUBAL RFEM - instability issue

[fabianjohnson]

Hello,
When i try to calculate the structure with RF TOWER DESIGN, I get the error: "The stiffness matrix is singular. the model is unstable. instability found in FE NODE nr.222..."
What this means and what can be the cause?

[Frank Faulstich]

Hello, instability can have many different causes. This FAQ will help you find the cause:

https://www.dlubal.com/en/support-an...ort/faq/003045

Frank Faulstich