What is one of the most common types of girder used in steel fabrication?

The box girder is one of the most common types used in steel fabrication due to its structural efficiency and versatility. Box girders have a hollow rectangular or square cross-section, which allows them to handle large loads and span considerable distances without excessive weight. This design provides high resistance to bending and torsional forces, making them ideal for bridges and large structural applications.

The hollow nature of box girders also makes them lighter than solid beams while maintaining strength, which is crucial in construction for minimizing material costs and facilitating easier handling and installation. Their ability to allow for accessories and utilities to be integrated into the girder structure is an added benefit, enhancing their functionality in various engineering projects.

In contrast, the other types mentioned, such as straight, in-line, and round girders, may be utilized in specific applications but do not offer the same overall advantages in terms of strength-to-weight ratio and versatility that box girders provide.