There are serious differences between the basement floor shear forces within the results of the normal and performance analyzes I made in the project I have chosen, and therefore the curtain elements remain in the collapse zone. I could not find the reason for this difference. /quote] Hello, The basement floor is considered as rigid in the project. Therefore, there is no difference in the horizontal forces of the basement floor calculated as a result of the analysis and performance analysis. In order to take the cracked section rigidity of the panels into account in the analysis, it is recommended not to model the walls as shells *No superstructure interactive solution is foreseen on rafter raft foundation *Apply 7A.3 (Upper limit of axial forces) option can be selected from the wall and column properties for performance analysis. In the light of the above information, the project analysis and linear performance When the mans analysis is done, the building performance is at the level of use in the X direction and at the level of life safety in the Y direction. Good work