About model convergence questions

[wcq19811982]

Dear vesna,
In my script code, the dispBeamColumn element is used to analyze the model,
it is convergent. However, if the nonlinearBeamColumn element is used to replace the dispBeamColumn element,
it is not convergent. Could you help me explain why it is so?
Thank you

[vesna]

To find the state of the element after one step of analysis DBE does not iterate, while FBE most of the time needs to iterate. That is why you may have convergence problems if you switch from DBE to FBE.

[wcq19811982]

Thank you for your reply.
Is it accurate for the results, DBE is adopted instead of FBE assuming convergent to use DBE and not convergent to use FBE.
Thank you

[vesna]

I responded to this in your earlier post.