1. Whether the I-beam 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. Therefore, it can generally only be used directly on its web plane. Internally flexed members or composed of lattice-type stressed members. It is not suitable for axial compression members or members that are perpendicular to the plane of the web and bending, which makes it very limited in the scope of application.
2. H-beams are high-efficiency and economical section profiles (others include cold-formed thin-walled steel, profiled steel plates, etc.). Due to the reasonable cross-sectional shape, they can make the steel more effective and improve the cutting capacity. Different from ordinary I-shaped, the flange of the H-beam is widened, and the inner and outer surfaces are usually parallel, which can facilitate the connection with other components with high-strength bolts. Its size constitutes a reasonable series, and the model is complete, which is convenient for design and selection (except I-beam for the crane beam).
3. The flanges of H-beams are of equal thickness, with rolled sections and combined sections composed of three welded plates. I-beams are all rolled sections. Due to poor production technology, the inner edge of the flange has a 1:10 slope. The rolling of the H-beam is different from that of the ordinary I-beam, which only uses one set of horizontal rolls. Because its flange is wide and has no slope (or small slope), it is necessary to add a set of vertical rolls for rolling at the same time. , its rolling process and equipment are more complicated than ordinary rolling mills. The maximum height of rolled H-beam that can be produced in China is 800mm, which exceeds the only welded composite section.
4. The side length of the I-beam is small and the height is large, so it can only bear the force in one direction.
5. The H-shaped steel groove is deep and thick and can bear the force in two directions.
6. With the development of steel structure buildings, only I-beam is not enough, and I-beam should be thickened, which is easy to lose stability when used for load-bearing columns.
7. I-beams can only be used for beams, while H-beams can be used for structural load-bearing columns.
8. H-beam is an economical section steel with better section mechanical properties than I-beam. It is named because the shape of the section is the same as the English letter “H”. The flange of a hot-rolled H-beam is wider than that of an I-beam, with large lateral stiffness and strong bending resistance. Under the same specifications, the weight of the H-beam is lighter than that of the I-beam.
9. The flange of the I-beam is of variable cross-section, which is thicker on the web and thin on the outside; the flange of the H-beam is of equal cross-section.
10. H-beams are divided into two types: hot-rolled and welded. HW refers to wide-flange H-beams, such as HW300x300, indicating that the section height and width are both 300 mm; HN is narrow-flange H-beams, such as HN300x150, indicating that the section height is 300 mm and the width is 300 mm. 150; HM has a flange width in between, eg HM300x200. HW, HN, and HM are all section types of hot-rolled H-beams. Soldered can generally write BH.
11. HW is that the height of the H-beam and the width of the flange are basically equal; it is mainly used for steel core columns in reinforced concrete frame structure columns, also known as rigid steel columns; it is mainly used for columns in steel structures.
12. HM is the ratio of H-beam height to flange width is roughly 1.33~1.75; mainly in steel structures: used as steel frame columns, and used as frame beams in frame structures bearing dynamic loads. For example Device Platform.
13. HN is the ratio of H-beam height and flange width greater than or equal to 2, which is mainly used for beams; the use of I-beams is equivalent to HN-beams.
