H-shaped steel is an economic profile (there are other cold-formed thin-wall steel, pressed steel, etc.), because of the reasonable cross-section shape, they can make the steel more efficient and improve the bearing capacity.
Unlike ordinary I-beams, the flange of H-shaped steel is widened, and the inner and outer surfaces are usually parallel, which can be easily connected with high-strength bolts and other members. Its size composition series is reasonable, the model is complete, easy to design and choose.
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 sleeves of the section is large, so it can only be directly used for the members bent in the web plane or it can be composed of lattice stress members. The axial compression member or the member that is perpendicular to the web plane and bent should not be used, which makes it have great limitations in the application range.
