1. you may also wish to read ATENA Troubleshooting, 2.2.15 How to model a load combination, e.g., a constant vertical force during horizontal displacement applied until failure? The current version of the document is available from our web (Products - ATENA - Documentation).

2. The loads should be applied in the same order as in reality. If both loads are to be increased simultaneously, of course you should define both in a single Interval.

3. With respect to nonlinear geometry, please see ATENA Troubleshooting, 2.1.9 Does the non linear analysis of ATENA consider the geometrical nonlinearity (second order effects, like buckling or necking)?

I assume this is not a very advanced question but i am not sure how to do it...
I want to have a vertical load on a wall while applying a lateral load. Do i have to create an interval (1) with the vertical load and an interval (2) with the lateral load? And does it make difference for the final results witch load is applied / calculated first (if i am using non linear material behavior)

And the geometrical non linearity in Atena is considered when checking geometrical non linear at the material definition?

Thank you very much!