Portal Steel Frame

A Portal Steel Frame is a prefabricated structural system widely used in industrial and commercial construction, defined by its rigid frame composed of steel columns and beams connected at rigid joints. Typically fabricated from high-strength structural steel (e.g., Q355, ASTM A36), the frame forms a "portal" shape—vertical or inclined columns integrated with curved or straight beams (often H-section or welded rigid beams)—creating a self-supporting structure that spans wide spaces without intermediate columns.

Renowned for its exceptional large-span capability, the portal steel frame can cover 15-50 meters (or more with customization), maximizing unobstructed interior space—ideal for factories, warehouses, and exhibition halls. Its prefabricated nature ensures off-site precision manufacturing of components (columns, beams, bracings), enabling fast on-site assembly via bolting or welding, shortening construction periods by 30-50% compared to traditional structures.

The frame’s integrated design delivers superior structural stability, efficiently resisting vertical loads (self-weight, snow, equipment) and horizontal forces (wind, seismic activity) without excessive bracing. Its high strength-to-weight ratio reduces foundation costs, while the flexible configuration supports single/multi-span layouts, gable roofs, and integrated cladding (color steel sheets, sandwich panels).

Durable and cost-effective, portal steel frames feature anti-corrosion treatments (hot-dip galvanizing, epoxy coating) for a 25-40 year service life with minimal maintenance. Steel’s recyclability aligns with green building standards, reducing environmental impact.

Common applications include industrial workshops, logistics centers, cold storage facilities, exhibition halls, aircraft hangars, and agricultural barns—any project demanding large clear spans, fast construction, and long-term reliability.