1. Whether I-shaped steel is ordinary or light, due to the relatively high and narrow cross-sectional dimensions, the moment of inertia of the two main axes of the cross-section is quite different. Therefore, it can generally only be used directly on its web plane. Internally bent members may be formed into lattice-type stress-bearing members. It is not suitable to use axial compression members or members that are perpendicular to the web plane and are curved, which greatly limits its application range.
2. H-shaped steel is an efficient and economical cutting profile (others include cold-formed thin-walled steel, profiled steel plates, etc.). Due to their reasonable cross-sectional shape, they can make the steel more efficient and improve its cutting capacity. Different from ordinary I-shaped steel, the flange of H-shaped steel is widened, and the inner and outer surfaces are usually parallel, which makes it easy to connect with other components with high-strength bolts. Its size and composition are reasonable, and its models are complete, making it easy to design and select.
I-beams are all rolled sections. Due to poor production technology, the inner edge of the flange has a slope of 1:10.
The flanges of H-shaped steel are all of equal thickness, and there are rolled sections and combined sections composed of three plates welded.The rolling of H-shaped steel is different from that of ordinary I-beams, which only use one set of horizontal rollers. Because its flange is wide and has no slope (or very small slope), it is necessary to add a set of vertical rollers for rolling at the same time. Therefore, , its rolling process and equipment are more complex than ordinary rolling mills.
