The calculations we perform allow us to evaluate the feasibility and then to optimize the variants in terms of costs, planning and safety, but also to provide the client with a global vision of the impact of his project on the built environment (added value in terms of image). With the help of advanced numerical modeling, we can get closer to the real behavior of the structure, bypass the simplifying assumptions sometimes required during a manual calculation, and thus sometimes validate a more daring (and often more economical) choice in terms of structural verification.