I-beams are high-efficiency and economical face-cutting steels (others include cold-formed thin-walled steels, profiled steel plates, etc.). Due to the reasonable cross-sectional shape, they can make steels more effective and improve cutting capacity. There are many specifications for I-beams, and different building construction projects have different requirements for I-beams.
Unlike ordinary I-beams, the flanges of the I-beams are widened, and the inner and outer surfaces are usually parallel, which can be easily connected with high-strength bolts and other components. Its size is reasonable, and the model is complete, which is convenient for design and selection.
In the design of the structure, the specifications of the I-beam should be selected based on its mechanical properties, chemical properties, weldability, and structural size.
The flanges of the I-beam specifications are of equal thickness, with rolled sections, and combined sections composed of 3 plates welded. Ordinary I-beams are rolled sections. Due to the poor production process, the inside edge of the flange has a slope of 1:10. I-beam rolling is different from ordinary I-beam using only one set of horizontal rolls. Due to its wide flange and no slope (or very small slope), a set of vertical rolls must be added to perform rolling at the same time. Therefore, its rolling process and equipment are more complicated than ordinary rolling mills. The maximum height of rolled H-beam that can be produced in China is 800mm, which exceeds the welding cross section.
Narrow flange I-beam specifications are suitable for beams or bending members, while wide-wing I-beams and I-steel piles are suitable for axially-compressed or bending members. Compared with HW and HN beams, ordinary I-beams and light I-beams are not as good as I-beams under the same weight.
