Hello Bentley team member,
When analyzing the an ram SS model in Ram frame, the program return an instability error and stopping the analysis.
The ram model file is uploaded in the secure file upload.
What should be change in the model to correct this error?
Also, the webpage for instability error link below had been review before posting.
communities.bentley.com/.../ram-instability-in-finite-element-analysis-tn
File: NYC 2022 BC.rss
Version: 17.04.03.05
Ram Frame Analysis warning for node 490. The warning if for a node in the middle of a wall. It only happens when the diaphragm is considered rigid. It works when the diaphragm is a meshed semi-rigid diaphragm. I thought it was due to the assigned eccentricity of the gravity loads, but I reset this to 0 and the problem persists. Another odd thing I found is that the analysis works if the braces are removed. For now I suggest using a semi-rigid diaphragm. I'll reply back if I can find out more.
I don't exactly understand but when I changed the beams to all fixed it worked. I changed them back to being pinned in the major axis in the knee braced frames and it's still OK. I'll send the revised file back to your email.