Steelframed

Steelframed is a term used to describe a building or structural system in which the primary load-bearing elements are a steel frame comprised of columns and beams connected to form a rigid skeleton that supports floors, roofs, and exterior walls.

The frame is typically complemented by floor assemblies such as steel decking with concrete topping or by composite slabs, and by lateral-resisting systems such as braced frames or moment-resisting connections. Connections are bolted or welded, with fireproofing and corrosion protection applied as needed. Non-structural elements are attached to the frame, allowing large clear spans and flexible layouts.

Advantages include a high strength-to-weight ratio, long spans that create open interior space, faster construction through prefabrication, and easier modification or expansion. Steel frames can perform well under seismic loads when designed with appropriate detailing. They also enable tall buildings and modular assemblies.

Limitations and challenges include higher upfront costs, the need for specialized fabrication and skilled labor, and the requirement for fireproofing, insulation, and protective coatings. Ongoing maintenance is important to prevent corrosion in exposed areas, and performance depends on protective detailing and construction quality.

Steelframed construction has been widely used in commercial, office, and industrial buildings since the late 19th century, with tall skyscrapers and mid-rise structures employing steel frames around the world. Modern practice often combines steel with concrete decks, glass façades, and computer-aided design to optimize performance and constructability.