A box girder is a closed section made from welded plates. Its torsional stiffness suits curved or skewed alignments, and its smooth exterior is easier to paint and keep clean.
Typical considerations
- Internal access and ventilation for inspection and coating, or a sealed-box design.
- Weld procedures and distortion control for long plate seams.
- Segment size and weight for transport and lifting.
Final member sizes, details and specifications are determined by the engineer of record for each project. This page describes general practice and does not replace project-specific engineering.
This content is general technical information. It does not replace project-specific structural design, which must be carried out or approved by a qualified engineer under the applicable codes and the requirements of the authority having jurisdiction.