The OpenSees Community

Hi,

I am trying to run a model of a nonlinear frame system with force-based elements using openseesSP. However, the analysis doesn't start at all and i get this error "ForceBeamColumn3d::update() -- could not invert flexibility". Although the analysis of the same model can be done successfully using sequential analysis.

Can you provide a minimum example, e.g., a one element model, where this error occurs?

What section model are you using? Do you have the same problem if you switch to 'section Elastic'?