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I-Beam
I-beam steel, whether ordinary or light, due to the cross-section size are relatively high, narrow, so the moment of inertia of the two main axes of the cross-section of the difference is large
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.
Ordinary I-beams and lightweight I-beams, due to the relatively high and narrow cross-section dimensions, have a large difference in the moments of inertia of the two main axes of the cross-section, which makes them have a great limitation on the scope of application.