Light steel portal frame structure - a cost-effective choice for small and medium-sized buildings
2025-06-04
Rising steel structure
Core structure and stress characteristics
The light steel portal frame consists of a portal frame (H-shaped steel beam-column rigid connection node), a purlin system (C/Z-shaped steel) and a support system to form a plane stress system. Its core advantage lies in the variable cross-section design - the cross-section of the beam and column is optimized with the change of internal force to achieve efficient use of materials; the roof and wall are made of lightweight corrugated steel plates (self-weight is only 0.1-0.3kN/㎡), and the foundation load is reduced by 40%-60% compared with the concrete structure.
Typical application scenarios
Applicable to industrial buildings (lightweight factories, warehousing and logistics) and commercial facilities (exhibition halls, garages) with a single span of 20-30 meters and a eaves height of 10 meters. Typical projects such as JD Logistics warehouses and small and medium-sized enterprise production workshops only take 4-8 weeks to build, and the cost is 20%-30% lower than that of concrete structures.
Three elements of selection
Span control: When the span exceeds 30 meters, a lattice frame or additional mid-span support is required to avoid excessive increase in the cross-section of beams and columns
Load adaptation: When the crane load is ≤20 tons, solid-web frame is preferred, and overweight loads need to be transferred to steel frame system
Node design: The moment transfer capacity of beam-column rigid joints needs to be verified, and hinged joints are only suitable for scenarios without cranes or light loads
