Mr. Yilmaz Polat my suggestions (Mr. NYILMAZ The upper rigid basement floor number will be correct -1. Even if -2 is given, the result will not change.) 2- On the beams around the elevator: a- take wall load on normal floors b- on the ceiling of the stair tower; If there is no gap in the DO6 flooring, close it c- in the stair tower ceiling; If you are going to cover the elevator with concrete, make at least 15 cm thick concrete and take the weight of the elevator as a point load on it. (machine component + elevator weight) d- On the ceiling of the stair tower; If the elevator will fit on U-profiles, calculate the load on which beam the profiles press and enter it as a point load on the beam 4- Solve the ladder as a semi-rigid diaphragm by processing it into your project. (If you do not solve it, you may encounter undesirable situations on the ladder.) Good luck with. Unver ÖZCAN