Also known as the I-beam girder (English title Universal Beam), is a cross-section of the steel strip the word shape. Beam sub-ordinary beam and light beam, H-beam three. Is a cross-sectional shape of the groove of steel. Beam is divided into ordinary beam, light beam and H-beam three. Ordinary beam, light beam flange is variable cross-section by a thick web portion, the outer thin; H-beam: HW HM HN HEA HEB HEM such as I-beam flange is equal section ordinary beam, light word Steel has become the national standard, ordinary 10 # I-beam is equivalent to I100 internationally (such as 10 # channel also corresponds to channel U100) (because the standard implementation of the different countries, resulting in their specifications have subtle differences) H type also called wide-flange steel beam, HW HM HN from European standards, HEB is the German standard I-beam, which HW, HN beam has been widely used and produced in our country. HEA HEB HEM on many German plan would see, in the domestic market is still very difficult to buy. Steel works in the country, if you can use less steel welding and other specifications splicing. The large, then, consider the use of the mechanical properties generally comparable HW, HN steel instead. HW beam is mainly used for reinforced concrete frame structure column steel core columns, also known as King of the steel column; mainly used in steel column HM steel flange height and width ratio of approximately 1.33 ~ 1.75, mainly in steel used to make steel frame columns frame structure to withstand dynamic loads to do with the frame beam; for example: device platform HN steel flange height and width ratio greater than or equal to 2; I-beam is mainly used for general purposes the equivalent beam HN steel; ◆ whether the word is a common type of steel or lightweight, due to cross-sectional dimensions are relatively high, narrow, so the cross-sectional moment of inertia larger difference between the two spindles, it can only be used directly within their web plane flexural its constituent components or lattice force component. For axial compression members or perpendicular to the plane of the web as well as curved components are not appropriate, which it has significant limitations on the scope of application. ◆ H-beam are efficient and economical cutting surface profiles (there are other cold-formed steel, pressure plate, etc.), due to a reasonable cross-section shape, they can make steel more play performance, improve the carrying capacity. Unlike ordinary worker is h-shaped steel flanges were widening, and the inner and outer surfaces generally parallel, so that makes it easy to connect with high strength bolts and other components. Constitutes a reasonable size series, complete model, ease of design choice. Scope ordinary beam, light beam, because of cross-sectional dimensions are relatively high, narrow, so the cross-sectional moment of inertia of the two main sleeve large difference in the range of applications which it has significant limitations . Beam used should be chosen according to the requirements of design drawings.