The difference between I-beam HW HM HN H-beam
I-beam flange is variable cross-section by the web part thick, thin outside; H-beam flange is equal cross-section, HW, HM, HN, H is the generic name of H-beam, H-beam is welded; HW HM HN is hot-rolled, HW is H-beam height and flange width are basically equal mainly used for steel core column in reinforced concrete frame structure column, also called strong steel column, mainly used for column in steel structure.
HM is H-beam height and flange width ratio is roughly 1.33~1.75, mainly in steel structure: used as steel frame column in the frame structure bearing dynamic load used as frame beam. For example, equipment platform.
HN is the ratio of H-beam height and flange width greater than or equal to 2, mainly used for beams. The use of I-beam is equivalent to HN section.
1, I-beam whether ordinary or light, because the cross-sectional size are relatively high, narrow, so the difference between the moment of inertia of the two main sleeves of the cross-section is large, therefore, generally can only be used directly in its web plane bending members or will be composed of lattice type force members. For axial compression members or in the perpendicular to the web plane and bending members are not suitable, which makes its application range has great limitations.
2, H-shaped steel is a highly efficient economic cutting surface profile (other cold-formed thin-walled sections, compression steel plates, etc.) due to the reasonable shape of the cross-section, they can make the steel more high performance, improve the ability to cut. Unlike ordinary I-beams, the flanges of H-beams are widened and the inner and outer surfaces are usually parallel, so that they can be easily connected with other members by high-strength screws. Its size constitutes a reasonable series, and the model is complete, so it is easy to design and select.
3, The flange of H-beam is of equal thickness, with rolled section and combined section made of 3 plates welded together. H-beam rolling is different from ordinary I-beam rolling with only one set of horizontal rolls, because of its wide flange and no slope (or slope is very small), it must be set up a set of vertical rolls rolled at the same time, therefore, the rolling process and equipment are more complex than ordinary mills. The largest domestic production of rolled h-beam height of 800mm, more than can only be welded combination section.
Advantages of H-beam
Wide flanges, high lateral stiffness, and high bending resistance.
The two surfaces of the flange are parallel to each other making connection, processing and installation easy.
Compared with welded I-beam, it has low cost, high precision, low residual stress, no need for expensive welding materials and weld inspection, saving about 30% of steel structure production cost.
Under the same cross-sectional load, the weight of hot-rolled H-steel structure is 15%-20% less than that of traditional steel structure.
Compared with concrete structure, hot-rolled H-steel structure can increase the use area by 6%, while the self-weight of the structure is reduced by 20%-30%, reducing the structural design internal force.
H-beams can be processed into T-beams and honeycomb beams can be combined to form various cross-sectional forms, which greatly meet the needs of engineering design and production.