ABSTRACT
Cold-formed steel structures are steel products made using thin flat sheets of steel at ambient temperatures and transformed into shapes which will support more than the flat sheet themselves. Nowadays, these systems are constructed as platform systems and balloon systems, while the platform system is being used more frequently. Gravity loads and lateral forces are carried on the load bearing steel wall and shear panels, respectively. Shear panels are made of crossbracing using thin tension-only straps in selected bays and load bearing steel walls made of steel studs. The shear panels and the steel stud walls of the platform system are discontinued in story levels, as shown in Fig. 1, but in the balloon system they are continued in the height of the structure.
