In modern buildings (I'm talking about taller structures, apartments, etc. not houses) that have a reinforced concrete framework are the internal / external walls (usually brick, masonry etc.) ever load bearing? In the sense is the strength / integrity of the structure ever depending or taking credit for the walls? Just curious. Looking at the way they are constructed, i.e. RCC framework & then later walls it doesn't seem like walls are essential to structural integrity but that's just a naive observation. Or is there no typical case and every building is a different situation.