1, H-beam belongs to the high-efficiency and economic section (other cold-formed thin-walled steel, compression steel plate, etc.), due to the reasonable shape of the cross-section, they can make the steel higher to play a role in the performance of the load-bearing capacity. Different from the ordinary I-beam is h-beam flange widening, and the inner and outer surfaces are usually parallel, so that it can be easy to use high-strength bolts and other components connected. Its size constitutes a series of reasonable, complete models, easy to design and selection.
2, I-beam steel, whether ordinary or light, due to the cross-section dimensions are relatively high, narrow, so the moment of inertia of the two main sleeves of the cross-section of the difference is large, therefore, generally can only be used directly for bending in the plane of its web components or will be composed of lattice-type force members. Axial compression members or perpendicular to the plane of the web and bending members should not be used, which makes it in the scope of application has great limitations.
3, H-beam flange are equal thickness, rolled section, there are 3 plates welded by the combination of cross-section. I-beam are rolled cross-section, due to poor production process, the inner edge of the flange has 1:10 slope. H-beam rolling is different from ordinary I-beam only with a set of horizontal rolls, due to its wider flange and no slope (or slope is very small), so it is necessary to set up a group of vertical rolls at the same time for roll rolling, so its rolling process and equipment are more complex than the ordinary rolling mill. Domestic production of larger rolled h-beam height of 800mm, more than can only be welded combination section. China's hot rolled H-beam national standard (GB/T11263-1998) H-beam is divided into narrow flange, wide flange and steel pile three categories, its code for hz, hk and hu. narrow flange H-beam is suitable for beams or compression bending members, while the wide flange h-beam and h-beam piles are suitable for axial compression members or compression bending members. I-beams are not as good as h-beams in terms of w, ix, and iy for equal weight compared to H-beams.
