I-beam is widely used in construction and other metal structures.

Whether I-shaped steel is ordinary or light, because the section size is relatively high and narrow, the moment of inertia of the two main axes of the section is quite different, so it can only be directly used for bending members in the web plane or forming lattice members

The selection of I-beam in structural design should be based on its mechanical properties, chemical properties, weldability and structural size.