The stairs are modeled to be solved together with the building. Its edges transfer load to the floor landing.Change the stair support settings with the option connected to the floors and activate the Semi-Rigid Diaphragm option in the Analysis settings General tab.Or you can solve the stairs independent of the structure."hkderinoz":3vag1rwj" said:error in the figure may be caused by the cause. I am sending the 7.17 demo 64 bit.system file, thanks, good work...