Type III Structure (Framed-Shear Wall Systems)

This system consists of a combination of frames which utilize beams and columns with the shear wall designed to resist lateral loads.

Type IV Structure (Framed Tube)

This tube is a structural system in which the perimeter of the build­ing, consisting of vertical, closely spaced supports, connected by beams or bracing members, acts as a giant vertical internally stiff­ened tube.