In recent years, with the development of China's economy and the continuous advancement of science and technology, large-span steel structures of various forms have been widely used in public buildings such as sports venues, exhibition centers, theaters, large shopping malls, airports, and stations. In the industrial sector, large-span industrial plants, especially under the requirements of environmental protection policies, have seen significant application in the enclosure of various material yards in recent years. Large-span steel structures have entered a period of vigorous development.
The concept of steel tube trusses
A structure formed by a plane or three-dimensional truss composed of round or square (rectangular) tubes. Its axis is a two-dimensional curve (such as an arc, parabola, catenary, or ellipse), and it relies on the thrust of the tubular truss column feet to resist the action of loads in the plane.
Steel tube truss structures, as a branch of large-span spatial structures, are widely applied in various engineering projects. They primarily utilize the excellent load-bearing performance and aesthetically pleasing external design of steel tubes to form a unique structural system that meets the design requirements of steel structures. Steel tubes have isotropic strength across all cross-sectional directions, high torsional stiffness, no weak axes under bending loads, and high load-bearing capacity, resulting in excellent structural performance. This structure does not require node plates, features a simple construction, is easy to fabricate and install, offers good structural stability, and has high roof stiffness. Additionally, steel tubes have relatively thin walls and hollow interiors, resulting in a lightweight structural system for steel tube truss structures. 
The circular cross-section of steel pipes provides excellent flow conditions, and when subjected to wind loads, their load effects are significantly lower than those of other steel structures. By sealing both ends of the steel pipes, they can be isolated from external air, offering excellent corrosion resistance; additionally, structures made of steel pipes have no dust-prone corners, making them easy to paint and maintain.
Therefore, steel tube truss structures have been widely applied not only in marine engineering, bridge engineering, and tower engineering but also in various industrial and civil buildings, with their applications becoming increasingly widespread.
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