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Walaikum Salam To perform Non Linear Analysis manually is very difficult. May be you can not find the solution for this. First of all, what do you mean by non linear on a cantilever beam? you can add non linearity in cantilever beam but then how you will apply seismic loading (static or dynamic) on this cantilever beam. Actually, this type of analysis is (in my opinion) is feasible for global level not for member local level. You can choose a structure and add material non linearity and then apply static or dynamic loading and then check the results. I am not sure which values you need for Tresca model. It depends upon your software which values it needs. Secondly, IT IS ALMOST IMPOSSIBLE TO VERIFY THE RESULTS OF NON LINEAR AT ALL. This needs practical judgement to check the results but can not be verified by any means. Thanks Muneeb