In modern construction engineering, steel structures are widely used due to their superior material properties and strong adaptability. Based on different structural forms, stress characteristics, and functions, steel structures can be divided into several categories. Each category has its own characteristics in terms of construction principles, applicable scope, and design points. A clear classification helps in accurate selection and optimized design in engineering practice.
According to the structural system, common types include portal frame structures, frame structures, truss structures, space frame and shell structures, as well as suspension and tension structures. Portal frame structures are characterized by lightweight roofs and rigid connections between columns. They have small component cross-sections and light weight, and are often used in large-span single-story buildings such as industrial plants and warehousing logistics facilities. Frame structures consist of beams and columns connected by rigid nodes to form a spatial skeleton, possessing both horizontal and vertical load-bearing capacity, and are suitable for multi-story and high-rise buildings. Truss structures utilize the geometric invariance of triangular elements to convert loads into axial forces in the members, and are commonly used in large-span, heavy-load scenarios such as roofs and bridges. Space frame and shell structures use spatial grid units to form curved or planar systems, enabling column-free spaces of tens or even hundreds of meters in length, and are widely used in public buildings such as stadiums and exhibition halls. Cable-stayed and tensioned structures rely on flexible cables under tension, combined with compression members or membrane materials to form lightweight, large-span covers, commonly found in airport terminals, landscape pergolas, and other uniquely shaped buildings.
Based on stress patterns, they can also be divided into pure frame, braced frame, and tube structures. Pure frame structures rely on beams and columns for bending resistance, offering flexible layout but limited lateral stiffness; braced frames significantly improve overall stability by incorporating lateral force bracing between frames, making them suitable for high-intensity seismic zones; tube structures utilize dense column surfaces or shear walls to enclose closed spaces, possessing excellent wind and earthquake resistance, and are one of the core forms of super high-rise buildings.
Furthermore, based on function and environmental adaptability, they can be divided into ordinary steel structures, weathering steel structures, fire-resistant steel structures, and cold-formed thin-walled steel structures. Different categories have different focuses in terms of corrosion resistance, fire resistance, and economy, meeting diverse engineering needs.
Scientific classification not only provides designers with clear selection criteria but also helps construction teams develop targeted process solutions, improving project efficiency and quality. With advancements in materials science and computational technology, the boundaries of steel structure types continue to expand, and their comprehensive value in green building and intelligent construction will become even more prominent.
