1. Portal Frames
Portal frames are the most widely used light steel system. Columns and roof beams are connected rigidly, forming a single-storey portal shape typical of industrial plants, warehouses and logistics buildings. The structure is low, regular and economical, which makes it a common choice for cost-sensitive, fast-delivery projects.
2. Moment Frames
Moment frames rely on rigid beam-to-column connections, giving stronger load-bearing and lateral resistance. They suit multi-storey and high-rise buildings, offices and commercial projects. Compared with portal frames, connections are more complex, so detailing accuracy and on-site erection matter more.
3. Truss Structures
Trusses transfer loads through tension and compression members, making them ideal for long-span roofs, bridges and equipment supports. A truss is light and spans large open areas, but the higher number of members and nodes increases detailing and fabrication work.
4. Space Grids and Long-Span Systems
Space grids and lattice systems form a three-dimensional load path through multi-directional members, and are used for gymnasiums, exhibition halls and hangars. These systems demand precise node geometry and usually require specialist detailing and dedicated fabrication.
5. How to Shortlist a System
Start with span, number of storeys and loading: portal frames for single-storey long spans, moment frames where vertical loads and multiple storeys dominate, and trusses or space grids when you need column-free coverage. Then weigh schedule, budget and local practice, and let the structural designer finalise the scheme.
Most systems share standard members, so see our H-beam page, steel truss members page and custom steel components page; for detailing support, our steel detailing service. Send us your drawings or scheme for a manufacturability review and quote.