In fabricated steel structures, steel pipe column sections have the following unique advantages:
1. The symmetrical cross-section of the square tube and the circular tube makes the moment of inertia of the section the same for each main axis, which is beneficial to the stability design of a single member;
2. The cross-section material is far away from the bending main axis, and can achieve large bending rigidity with less material and high economy.
3. The torsional rigidity of the closed section is large.
4, can be used with concrete, significantly enhanced load bearing, stiffness and fire resistance.