The difference and application of H-beam and I-beam

The difference and application of H-beam and I-beam

1. Whether the I-shaped steel is ordinary or light, because the cross-sectional size is relatively high and narrow, the moment of inertia of the two main sleeves on the cross-section is quite different. Therefore, it can generally only be used directly on its web Bending members in the plane or form them into lattice-type stressed members. It is not suitable for axial compression members or members with bending perpendicular to the web plane, which limits its application range. the

2. H-beams are high-efficiency and economical cutting profiles (others include cold-formed thin-walled steels, 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 steel, the flange of H-shaped steel 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 models are complete, which is convenient for design and selection (except for I-shaped steel for crane beams).

3. The flanges of the H-shaped steel are all of equal thickness, and there are rolled sections and combined sections composed of three plates welded. The I-beams are all rolled sections. Due to poor production technology, the inner edge of the flange has a slope of 1:10. The rolling of H-shaped steel is different from ordinary I-shaped steel with only 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 to roll at the same time. Therefore, , its rolling process and equipment are more complicated than ordinary rolling mills. The maximum height of rolled H-shaped steel that can be produced in China is 800mm, which can only be welded combined 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 withstand forces in two directions.

6. With the development of steel structure buildings, only I-beams are not enough, that is, thickened I-beams, which are easy to lose stability when used in 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-shaped steel is an economical cross-sectional steel with better mechanical properties than I-shaped steel. It is named because its cross-sectional shape is the same as the English letter "H". The flange of the hot-rolled H-beam is wider than the I-beam, with greater lateral stiffness and stronger bending resistance. Under the same specification, the theoretical weight of H-beam is lighter than that of I-beam.

9. The flange of the I-beam is thick on the web part on the variable wearing surface and thin on the outside; the flange of the H-beam is the constant wearing surface.

10. HW, HM, and HN are general names for H-beams, and H-beams are welded; HW, HM, and HN are hot-rolled.

11. HW means that the height of H-shaped steel is basically equal to the width of the flange; it is mainly used for steel core columns in reinforced concrete frame structure columns, also known as stiff steel columns; it is mainly used for columns in steel structures.

12. HM means that the ratio of H-shaped steel 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 means that the ratio of H-beam height to flange width is greater than or equal to 2, mainly used for beams; the use of I-beam is equivalent to HN-beam.