What are the Characteristics of the Steel Structure Design of the ERW Steel Pipe

The erw steel pipe is a product produced by the use of the skin effect and proximity effect of the high-frequency current after the hot-rolled coil is formed by the forming machine to heat and melt the edge of the pipe blank, and then perform pressure welding under the action of the extrusion roller. Mainly used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, etc.

Compared with structures made with open sections, steel tube structures can save about 20% of steel in industrial buildings and about 50% in tower structures. According to the force state of the parts, supply conditions, production and processing conditions and costs, the structure of the steel pipe can be a round pipe structure or a rectangular pipe structure, or a mixture of two steel pipes. When used in combination, the chord is generally a rectangular tube, and the web is a circular tube. Sometimes, the chords can also be made of I-beams or H-beams, and the ribs can be rectangular or round tubes.

The advantages of erw steel pipe:

1) The geometric properties of the erw steel pipe section are good, the pipe wall is generally thin, the section material is distributed around the center of mass, the section gyration radius is large, and the torsional rigidity is large; as a compression, bending and bidirectional bending member, its bearing capacity is high, and it is cold The straightness and cross-sectional dimensions of elbows are more accurate than the cross-section of hot-rolled openings;

2) In terms of anti-hydrodynamic properties, the cross section of the round tube is the best, and the flow effect of wind and water is greatly reduced. The cross section of a rectangular tube is similar in this respect;

3) The steel pipe is a closed section; under the same average thickness and cross-sectional area, the exposed surface area is about 50% to 60% of the open section, which is beneficial to prevent corrosion and can save paint;

4) The connection of the nodes is suitable for direct welding, which can save labor and materials without passing through gussets or other connecting parts;

5) The appearance is relatively beautiful, especially the pipe frame composed of steel pipes, without redundant node connections, has a strong sense of modernity;

6) If necessary, pour concrete into the pipe to form a composite member.

When mechanical properties are stable, local buckling is prone to occur when pressure is applied, but post-buckling strength and hydrodynamic resistance are most beneficial. The minimum force is poor. Under the same cross-sectional area, the surface area is the smallest, and the surface area is slightly larger; more materials are used for refractory and anti-corrosion materials.