H-beam is a kind of high efficient profile with economic cross-section which the distribution of cross-section area is more optimized and the ratio of strength to weight is more reasonable, and it is named because its cross-section is the same as the letter “H” in English. Since all parts of H-beam are arranged at right angles, H-beam has the advantages of strong bending resistance in all directions, simple construction, cost saving and light weight of structure, etc., and has been widely used.