A section of aircraft fuselage includes a body structure and a floor connected to the body structure. The body structure has an external skin and a framework including frames, positioned in fuselage cross-sections approximately perpendicular to a longitudinal axis in an aircraft reference frame. The floor has cross members extending along a lateral axis. The cross members and the frames are disconnected and each cross member, at opposite ends, is fixed to the body structure by an intermediate structural assembly connected on the one hand to the cross member and on the other hand to the external skin and/or to one or more frames.