My suggestions for your Mr. Sereze project 1- If you are going to create a slab with the slab edge, this edge line should divide the beam or curtain on both sides. yours did not divide the curtains, 2- it would not be correct to describe the stair load by writing this type of flooring, 3- if you are going to solve the system rigidly, add additional stair load on the beams, 4- if you are going to solve semi-rigid, enter the stairs as described in the forum (describing the recessed conditions) and program the load transitions to the beams, 5 - I think the K2 beam will be inclined. Take it easy Unver ÖZCAN