I-beam also known as the steel beam (English name Universal Beam), is a cross-section of the shape of the long strip of steel. I-beam ordinary I-beam and light I-beam. Sectional shape is I-shaped steel.

The basic difference

I-beam is divided into ordinary I-beam, light I-beam, low-alloy light I-beam three.

Common I-beam, light I-flange flange section is by thickening the web section, the outer thin; H-beam: HW HM HN HEA HEB HEM and other steel flange is equal section

Ordinary I-beam, light I-beam has formed a national standard, the general I # 10 I-beam is equivalent to the international I100 (for example, 10 # channel equivalent to channel U100) (because of the implementation of different standards, causing them Specifications have subtle differences)

H-shaped I-beam also known as wide-flanged steel, HW HM HN from the European standards, HEB is the German standard I-beam, HW, HN I-beam has been widely used and produced in our country. The HEA HEB HEM is seen on many German design drawings and is hard to buy on the domestic market. In the domestic steel structure project, if the amount of less you can use such specifications of steel welded splicing. The large amount of words, usually consider the use of mechanical properties and the equivalent of HW, HN steel instead.

HW I-beam is mainly used in reinforced concrete frame column in the steel column, also known as the rigid steel column; in the steel structure is mainly used for column

The ratio of height of HM section and flange width is approximately 1.33 ~ 1.75. It is mainly used as steel frame column in steel structure as frame beam in frame structure subjected to dynamic load. For example: Equipment platform

HN steel height and flange width ratio greater than or equal to 2; mainly used for the beam

The use of ordinary H-beam is equivalent to HN steel;

◆ I-shaped steel, whether ordinary or light, due to the cross-sectional size are relatively high, narrow, so the cross section of the two spindles of the larger moment of inertia, it can only be used directly in its web plane bending Or form a grid-like force member. Axial compression member or in the plane perpendicular to the web and bending components are not suitable, which makes it in the application of a great extent.

◆ H-beam belongs to the efficient economic profile (other cold-formed thin-walled section steel, profiled steel plate, etc.), because of the rational shape of the cross-section, they can make the steel higher performance, improve the carrying capacity. Different from the common type is the h-beam flange widened, and the inner and outer surfaces are usually parallel, so that easy to use high-strength bolts and other components connected. Its size constitutes a series of reasonable, model complete, easy to design selection.

The scope of application

Ordinary I-beam, light I-beam, due to the cross-sectional size are relatively high, narrow, so the main two sections of the moment of inertia of the main difference between the larger, which makes it in the scope of application has a great limitation. The use of I-beam should be based on the requirements of design drawings for selection.

Size design

H-beam is a high-efficiency economical profiled steel (there are other cold-formed thin-walled section steel, profiled steel, etc.), due to the rational shape of the cross-section, they can make the steel higher performance, improve the ability to bear. Unlike conventional I-beams, the flange of the H-section is widened and the inner and outer surfaces are generally parallel so that it can be easily connected to other components using high-strength bolts. Its size constitutes a reasonable model complete, easy to design selection.

In the structural design of the selection of steel should be based on its mechanical properties, chemical properties, solderability, structural dimensions, such as the choice of reasonable use of I-beam.

Welding process

H-beam flange is equal thickness, there are rolling cross-section, but also by the combination of three plate welding cross-section. Common I-beam are rolling cross-section, due to poor production technology, flange within the slope of 1:10. H-beam rolling is different from ordinary I-beam only a set of horizontal roller, because of its wide flange and no slope (or slope is very small), it is necessary to add a group of vertical roll roll at the same time, therefore , The rolling process and equipment are more complex than ordinary rolling mill. The maximum domestic production of H-beam can be rolled to a height of 800mm, which exceeds the welded cross-section.

Narrow flange h beam for beam or bending members, and wide flange h-beam and h-type steel piles are suitable for axial compression member or bending member. Ordinary I-beam, light I-beam and HW, HN-shaped steel compared to the same weight, w, ix, iy not as good as H-beam