1. The geometric characteristics of the cross section of the pipe are good, the tube wall is generally thin, the section materials are distributed around the shape, the cross -sectional rotation radius has a large radius, and it has a strong twist -resistant stiffness. High force, and the level of straightness and section size of the cold -forming pipes is better than the section of the hot -rolled opening.
2. From the perspective of anti -stream dynamic characteristics, the cross section of the tube is the best, and the effect of wind and water flow is greatly reduced. The cutting section of the rectangular tube is similar to other opening sections in this regard.
3. The steel pipe is a closed section; when the average thickness and cross -sectional area are the same, the exposure surface area is about 50 % to 60 % of the opening section, which is beneficial to corrosion corrosion and saves coating materials.
4. The node connection is suitable for direct welding, but it does not pass the node board or other connectors, which is both labor -saving and ingredient.
5. The shape is more beautiful, especially the tube truss composed of steel pipe components. There is no excess node connection and a strong sense of modernity.
6. If necessary, concrete can also be poured inside the tube to form a combined component.
Due to the above advantages, the steel pipe structure has a structure of about 20 % of the steel in industrial buildings compared with the structure made by the opening section, and the amount of saving can reach 50 % in the tower structure. The steel pipe structure can use the circular tube structure or rectangular tube structure according to the pressure of the component, supply conditions, production and processing conditions, and cost, and can also be mixed with two steel pipes. When mixed, the string rod is generally rectangular tube, and the abdominal rod is used in a round tube; sometimes, the string rod can also be used in a rectangular tube or a round tube for the abdominal rod.
During the mechanical performance, the stability is best to be prone to local flexion when it is compressed. Fire resistance and anticorrosive materials are the most saved.
