topic Re: Type 3 instability for a building model in Robot Structural Analysis Forum

Type 3 instability for a building model

omarVJFPE — Wed, 03 Nov 2021 21:06:20 GMT

Hello,

I've been quite careful while modelling my structure to minimize any possible errors however I seem to be getting a single node with a type 3 instability. I looked at webinar 16 regarding this instability when you have large differences in stiffness but not sure why it is in a very specific node rather than the entire model? I even looked at nodal displacements and get a value of zero for all RX for that particular node. I am planning on performing a seismic analysis and wind analysis eventually but would like to resolve this issue before moving forward. Any help would be valuable here. Link to model can be found here: Building Model link

Re: Type 3 instability for a building model

Simau — Thu, 04 Nov 2021 09:42:30 GMT

Hi @omarVJFPE

Based on your verification this warning can be ignored.
This warning disappeared after a new remesh

Re: Type 3 instability for a building model

omarVJFPE — Thu, 04 Nov 2021 14:42:11 GMT

Thank you very much @Simau !

I never would have realized that meshing was the culprit here.