I - beams are widely used in buildings and other metal structures.
Whether the I-section 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 large, so it can only be directly used in the web plane bending members or it is composed of lattice stressed members.
The selection of I-steel in the structural design should be based on its mechanical properties, chemical properties, weldable properties, structural size and other reasonable selection of I-steel for use.