Which factor is specifically used when applying a load in bending about the minor axis of a beam?

The correct choice is based on the specific context of applying loads during the design of beam structures. Cfu, which stands for the "modification factor for flexural strength," is particularly relevant when considering bending about the minor axis of a beam.

When designing beams for bending, especially in cases of non-uniform load distribution or special conditions like lateral-torsional buckling, the flexural strength must be adjusted using this modification factor. Cfu takes into account various aspects such as the material properties and cross-sectional shape that influence how the beam will withstand bending moments applied about its minor axis. Using this factor assists in ensuring that the structural integrity is maintained while considering the relevant design limitations.

In contrast, the other factors mentioned may relate to different aspects of beam behavior or loading conditions, such as shear or axial loading, which are not directly applicable in the context of bending about the minor axis. Focusing specifically on Cfu allows engineers to accurately assess and ensure the structural performance of beams under bending loads.