A built-up steel beam is a custom-fabricated structural steel member used to carry heavy vertical loads and span long distances in construction projects. Unlike standard rolled beams, built-up steel beams are manufactured by cutting, shaping, and welding steel plates into a stable I-shaped or box-shaped cross-section.

Box steel column, also known as square hollow structural column, is a highly efficient vertical load-bearing member widely used in steel frame construction. Its closed square section provides excellent torsional resistance, structural stability and compressive strength, making it suitable for columns, supports, frames and heavy-load structures.