Forming Process, Cross-sectional Properties, and Structural Functions of Square Tubes in Steel Structures
Release time:
2025-07-15
Through the rational selection of cross-sectional dimensions, wall thickness, and materials, square tubing can fully realize its structural functions in steel structure buildings, achieving a harmonious balance of safety, economy, and aesthetics.
Square tubes, as an economical cross-sectional profile, possess unique structural functions in steel structure buildings due to their forming process and cross-sectional properties. Square tubes are primarily produced from hot-rolled steel coils, undergoing cold bending, high-frequency welding, and sizing. The forming process can be divided into direct forming and indirect forming. Direct forming involves gradually bending steel strips into a square cross-section using multiple rollers; indirect forming first forms a round tube, then shapes it into a square tube using sizing rollers. Square tubes have a square or rectangular cross-section with rounded corners. Compared to round tubes, square tubes have a larger section modulus and moment of inertia, resulting in superior bending and torsional stiffness. The smooth surface of square tubes facilitates connection and decorative finishing. The uniform wall thickness and precise cross-sectional dimensions of square tubes meet the accuracy requirements of building structures.
The structural function of square tubes in steel structure buildings is reflected in their application as load-bearing components such as beams, columns, and trusses. When used as beams, the high section modulus of square tubes gives them high load-bearing efficiency under bending moments, reducing component height and saving building space. When used as columns, square tubes have equal or nearly equal moments of inertia in the two principal axes, exhibiting strong buckling resistance and making them suitable for axial compression and bidirectional eccentric compression. In truss structures, square tube members are easy to connect, with simple node construction, direct force transmission, and high material utilization. Square tubes can be directly welded together without gusset plates, resulting in a clean appearance. The internal cavities of square tube structures can be used for pipeline installation, achieving integration of pipelines and structure and improving space utilization.
The advantages of square tubes in steel structure buildings also lie in their excellent processing performance and architectural aesthetic value. Square tubes are easy to cut, drill, and weld, and can be processed into various complex connection nodes. The smooth surface of square tubes facilitates the application of fire-retardant and anti-corrosion coatings, and also facilitates the application of decorative panels. In industrial plants, square tubes are used to construct rigid frame beams, columns, and crane beams, offering high load-bearing capacity and fast construction speed. In public buildings, square tubing is used to construct large-span roofs and spatial grid structures, resulting in a simple and modern design. In residential buildings, square tubing is used to construct lightweight steel structural frames, which, combined with composite wall panels and floor slabs, enable rapid assembly. The good permeability of square tubing structures facilitates lighting and ventilation, aligning with green building principles. Through the rational selection of cross-sectional dimensions, wall thickness, and materials, square tubing can fully realize its structural functions in steel structure buildings, achieving a harmonious balance of safety, economy, and aesthetics.
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