Actually, a masonry wall should be analyzed as a structural element and not a collection of various materials. Often, assumptions are not realistic and the loads applied are not included, upsetting the global situation an d stresses.
Depending on the dimensions and aspect ratio, some of the loads can be distributed to adjacent members (columns, floors and intersecting walls.
Partition walls are usually quite thin and it is like a flat plate. Once you get into a 6" wall, there is considerable stiffness and strength that can affect a structure. That is why there is considerable use of 6" CMUs in loadbearing construction.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.