Cold Formed Steel

Note : The use of cold formed steel in the manner descriubed in attrachd slides is not common in Malaysia .

Cold Formed Steel

• Basic cold-formed sections are usually open shapes & mostly sysmmetrical about one axis only .
• Closed & sysmmetrical sections may be formed by lock seaming , bolting or welding the basic sections together , resulting in sections having greater rigidity & torsional strength .
• Skeleton frames constructed with cold-formed sections invariably have composite sysmmetrical sections for the main members .
• Stanchions may be I - section formed of two lipped -channels resistance welded or bolted back to back or hollow-section formed of two similar channels welded lip to lip 
• The greater stiffness of the hollow form , is more suitable for tall stanchions . Main beams may be I-section for spans up to about 5m to 6m , beying which built-up lattice beams are more economical .
• I-section members allow cleat & bolt connections similar to those for hot-rolled sections although , because of the thinness of the metal , stiffening plates welded on at the connections may sometimes be necessary .
• Bolted connections cannot be made directly on to hollow stanchions . Fixing cleats & plates must , therefore , be welded on to these stanchions to provide fixing for beam .