Ordinary I-beam and lightweight I-beam, due to their relatively high and narrow cross-sectional dimensions, have a significant difference in the moment of inertia between the two main sleeves of the cross-section. Therefore, they can generally only be directly used for components that are bent in their web plane or formed into lattice load-bearing components. It is not suitable to use axial compression components or components with bending perpendicular to the web plane, which limits their application range.
The use of I-beams should be selected according to the requirements of the design drawings. The side length of I-beam is small, the height is large, and it can only withstand forces in a single direction. With the development of steel structure buildings, there is only one type of I-beam that is not feasible, which is thickened I-beam, which is prone to instability when used for load-bearing columns. I-beams can only be used for beams, not for load-bearing columns in structures. The flange of I-beam gradually thins from the root to the edge, with a certain angle, which is a prominent feature that distinguishes them.
In addition, the I-beam model is represented by the Arabic numerals of its waist height in centimeters. When encountering models with the same waist height, add a, b, and c to distinguish them, such as 20a, 20b, and 32c. The waist height of the first two is 20cm, but the thickness and width of the web and flange are different.
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