The wall thickness requirements of LSAW Steel Pipes in the field of building steel structures usually depend on multiple factors, such as the type of structure, load size, span, and usage environment. Here are some common situations:

General building structural support

Multi story buildings: For the frame structure support of multi story buildings, when LSAW steel pipes are used, if the diameter of the steel pipes is between 200-400mm, they are used to withstand lateral forces such as general wind loads and seismic effects, as well as some vertical loads, and the wall thickness is generally between 6-10mm. For example, in some ordinary multi story commercial buildings in cities, the steel pipes supporting the frame often adopt this wall thickness range, which can meet the stability and strength requirements of the structure under normal use and conventional disaster situations.

High rise buildings: In high-rise buildings, due to the need to withstand larger vertical and horizontal loads (such as wind loads, earthquake loads, etc.), for LSAW steel pipe supports with a diameter of 400-800mm, the wall thickness may need to reach 10-20mm. For example, the slant support steel pipe between the core tube and the outer frame of a super high-rise building will adopt a thicker wall thickness to ensure the safety of the structure in strong wind or earthquake.

Large span spatial structure

Sports venues: For the roof structure of large sports venues, if LSAW steel pipes are used as truss or grid members, when the span is between 30-80m, for steel pipes with a diameter of 300-600mm, the wall thickness is generally between 8-16mm. For example, for some steel structural members of the Bird's Nest, LSAW steel pipes with appropriate wall thickness were selected based on their stress characteristics and span requirements to achieve stable load-bearing of large-span spatial structures.

Exhibition Center: In the large-span roof or spatial structure of the exhibition center, the wall thickness of LSAW steel pipes also has similar requirements. If it is to bear the self weight of the roof, snow load, and possible suspension load, for structures with a span of 50-100m, steel pipes with a diameter of 400-800mm may have a wall thickness of 10-20mm to ensure the safety and reliability of the structure under various load combinations.

Special building structures

Marine platform construction: In the upper structure of the marine platform, due to the need to withstand wave forces, sea breeze loads, and seismic effects, as well as environmental factors such as seawater corrosion, the wall thickness requirements for LSAW steel pipes are relatively high. For steel pipes with a diameter of 400-1000mm, the wall thickness is usually between 12-30mm. For example, some steel structure support pipes of deep-sea oil extraction platforms use thick walled LSAW steel pipes, combined with special anti-corrosion coatings and protective measures, to resist the erosion of the marine environment and various complex loads.

High rise building structures, such as TV towers, chimneys, etc., use LSAW steel pipes as the main structural components. In order to ensure the wind resistance and stability of the structure, for steel pipes with a diameter of 300-600mm, the wall thickness is generally 8-18mm. Taking a TV tower as an example, the steel pipe structure of its tower body needs to withstand huge wind loads and its own gravity, and a suitable wall thickness can ensure that the structure will not be damaged during long-term use.

The following are some standard specifications related to the wall thickness requirements of LSAW steel pipes in the field of building steel structures:

Chinese standards

GB 50017-2017 "Design Standard for Steel Structures" provides comprehensive regulations on the design principles, material selection, load calculation, and component design of steel structures. In terms of wall thickness requirements, the minimum wall thickness limits for different types of steel structural components are specified while meeting requirements for strength, stability, and stiffness. For example, for steel pipe components under compression, corresponding wall thickness calculation formulas and value ranges are provided based on factors such as force magnitude and calculated length, to ensure that the components will not experience local instability or strength failure due to insufficient wall thickness during use.

GB/T 3091-2015 "Welded Steel Pipes for Low Pressure Fluid Transport": applicable to welded steel pipes for low-pressure fluid transport such as water, air, heating steam, gas, etc. Although not specifically designed for building steel structures, LSAW steel pipes may be used in low-pressure fluid transport pipeline systems in some buildings. This standard specifies the size, shape, weight, and allowable deviation of steel pipes, including the wall thickness series and allowable deviation range corresponding to different nominal outer diameters.

GB/T 12754-2019 "Colored Coated Steel Plates and Strips": If LSAW steel pipes have colored coatings on their surfaces for building appearance or anti-corrosion purposes, this standard specifies the dimensions, shape, weight, allowable deviations, technical requirements, etc. of colored coated steel plates and strips. This involves requirements such as coating thickness and substrate thickness, and the substrate thickness is somewhat related to the wall thickness of the steel pipe, indirectly placing requirements on the wall thickness of LSAW steel pipes with coatings.

Industry standards

JGJ 81-2011 "Technical Specification for Welding of Building Steel Structures": mainly focuses on welding processes, quality control, and other aspects of building steel structures. When it comes to welding LSAW steel pipes, there are certain requirements for the wall thickness of the pipes. For example, pipes with different wall thicknesses have different regulations on the selection of welding process parameters and the design of welding joint forms to ensure welding quality and structural safety. For example, for steel pipes with thicker walls, it may be necessary to use multi-layer and multi pass welding, and strictly control parameters such as interlayer temperature.

JG/T 188-2017 "Steel Plates and Strips for Building Structures": specifies the dimensions, shape, weight, allowable deviations, technical requirements, etc. of steel plates and strips for building structures. For LSAW steel pipes used in building structures, if their materials meet the requirements of steel plates and steel strips in this standard, they also need to meet the corresponding regulations in terms of wall thickness, such as determining the appropriate wall thickness range based on different strength grades, usage environments, and other factors.