I have an idea to discuss here related to Punching shear; that is In categorization of columns there are :
1. Interior ,where the distance from each face of a column to the slab edge is at least four times the slab thickness
2. Edge column, where one face of a column in direction of design strip is closer to the slab edge in the same direction by four times the slab thickness .
3. Corner column, where two adjacent faces of a column are closer to their associated slab edges by less than four times the slab thickness. But the issue that is SAFE doesn't consider these definitions so it may give safe results where it may be unsafe .
Please discuss All Regards