A single-span portal frame is a simple and efficient structural system widely used in industrial buildings, warehouses, and workshops. It consists of two vertical columns connected by a horizontal beam at the top, forming a rigid "U" shape. The design offers clear spans without internal supports, maximizing usable space. Typically constructed from steel for high strength-to-weight ratio, it provides excellent load-bearing capacity against vertical and lateral forces. Its modular design allows quick assembly and cost-effective construction. The frame's rigidity resists bending and shear stresses, while diagonal bracing enhances stability. This lightweight yet durable solution is ideal for medium-sized structures requiring flexibility, economy, and fast project completion.