If you know how to use the arc length method in Feap, please give me a template. I am using Feap 7.5. I need to use the arc length method to simulate a structure after a critical point. For that problem, I think that it is necessary to combine the Newton-Raphson method with the arc length method (displacement control). If you are friendly with Feap, could you give me some tips?

Thank you in advance,

NH NGUYEN.