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The main structural forms of steel structures include portal steel frames, frames, trusses, trusses, arches, suspension cables, thin-walled spaces, etc. These structural forms each have their own advantages and disadvantages, and are suitable for different building needs. For example, portal steel frames are suitable for large-span buildings such as factories and warehouses; The frame structure is suitable for buildings that require greater spatial flexibility, such as shopping malls and office buildings; Trusses and grid structures are commonly used in the construction of large venues and bridges; Arched and suspended structures are suitable for buildings that require heavy loads, such as sports arenas and exhibition halls. ‌       Steel structures are widely used in large factories, venues, high-rise buildings, and bridges due to their light weight and simple construction. However, steel structures are prone to rusting, so regular maintenance work such as rust removal, galvanizing, or coating is required.

Portal steel frame system: The portal steel frame structure is mainly composed of transverse rigid frames composed of columns and beams as the main load-bearing structure, and the steel frame is a planar load-bearing system. To ensure longitudinal stability, column supports and roof supports are installed. The steel frame columns and beams in the rigid frame are made of H-section steel, and various loads are transmitted to the foundation through the columns and beams.       Multi layer frame system: The multi layer frame system consists of frame beams and frame columns, and is used for high-rise and high-rise civil and public buildings. The multi-layer frame system includes mechanical models such as pure rigid frame, rigid support frame, and supported frame. The frame columns can adopt H-shaped sections, box shaped sections, cross shaped sections, circular tube shaped sections, etc.       Truss: The truss is composed of metal rods and has a triangular unit plan view or indoor spatial structure. The members mainly bear tensile or compressive strength, which can fully utilize the material strength. It is suitable for structures with large spans, saving materials and reducing weight.       Spherical grid structure: The spherical grid structure is composed of multiple members connected in a certain grid pattern, and has the characteristics of spatial stress, light weight, high stiffness, and good seismic resistance. It is suitable for buildings such as sports venues, cinemas, and exhibition halls.       Cable membrane structure: Cable membrane structure originated from tent structure, and modern cable membrane structure uses high-strength, moisture-proof, and transparent membrane materials, which are widely used in commercial buildings such as seaside tourism and exhibitions.       Light steel structure: Light steel structures are usually welded from round steel, small angle steel, thin-walled steel or thin steel plates, and have the advantages of light weight, low cost, high degree of manufacturing industrialization, and fast construction speed. They are suitable for industrial plants, small and medium-sized buildings, etc.       Tower and mast structure: Tower and mast structures are used for high-rise buildings, such as television towers, microwave towers, communication towers, etc., with high stability and load-bearing capacity.       High rise steel structures: High rise steel structures include television towers, microwave towers, communication towers, etc., which are usually used in buildings that require height and stability.       Plate shell steel structure: Plate shell steel structure is used for containers that require sealing, such as large oil storage tanks, gas storage tanks, etc., and buildings that need to withstand large internal forces and temperature changes.

The application prospects of steel structures are very broad, mainly reflected in the following aspects:       Market demand continues to grow: With the development of the global economy and the acceleration of urbanization, the demand for the construction industry will continue to grow. As an effective and environmentally friendly form of building structure, steel structures will be widely used in residential, commercial, industrial, and public buildings, with broad market prospects.       Policy support: The country's increasing support for green buildings and environmental protection industries has provided a favorable policy environment for the development of the steel structure industry. As a green building material, steel structure has significant advantages in energy conservation, emission reduction, and environmental protection, which meets the national requirements for green buildings and sustainable development. In addition, the government will increase the regulation and supervision of the steel structure industry to promote its healthy development.       Technological progress: The application of new materials, advanced processes, and intelligent manufacturing technologies will further optimize the design, production, and installation processes of steel structures, improving product quality and production efficiency. For example, BIM technology can provide a comprehensive information model for steel structure buildings, realizing the informatization and collaboration of design, construction, and operation management, greatly improving the efficiency and quality of steel structure buildings.       Export market potential: With the gradual elimination of international trade barriers and the acceleration of globalization, the export market of the steel structure industry will further expand. As one of the world's largest producers of steel structures, China has strong competitiveness in the international market. In the future, we will further strengthen technology research and development and brand building, expand the international market, and increase our export share.       Diversified application scenarios: The application of steel structures in infrastructure, public buildings, industrial plants and other fields has begun to take shape, and the application scenarios are constantly expanding. Steel structure buildings have become a rapidly developing sunrise industry due to their characteristics of lightweight, high strength, earthquake resistance, corrosion resistance, and strong durability.

Steel structures have been widely used in various fields due to their high strength, lightweight, and excellent seismic performance. ‌‌       Industrial and commercial buildings   Steel structures are widely used in industrial plants, warehouses, large manufacturing facilities, and other places. Due to its light weight and fast construction speed, it can meet the needs of large open spaces and is commonly used in fields such as mechanical manufacturing, electronics industry, automobile manufacturing, petrochemicals, light industry textiles, and building materials industry. In addition, steel structures are also used in commercial complexes, high-rise buildings, and sports venues, providing greater spatial freedom and seismic performance.       Bridge Engineering   In projects such as large-span bridges, cable-stayed bridges, and suspension bridges, steel structures, due to their high strength and lightweight characteristics, can reduce the requirements for foundations, improve the bearing capacity and seismic performance of bridges. For example, some bridges on the Yangtze River and elevated bridges in cities have adopted steel structures to ensure smooth and safe traffic.       Underground space engineering   In projects such as underground garages, underground commercial spaces, and underground passages, steel structures can achieve flexible layout and renovation of underground spaces due to their plasticity and disassembly, improving the sustainability and maintainability of the project.       Aerospace and energy sectors   Steel structures are also used in projects such as aircraft fuselage, landing gear, nuclear power plants, and wind turbine towers. Its high strength, high temperature resistance, and corrosion resistance enable steel structures to adapt to harsh working environments, improving equipment reliability and safety.       Transportation field   In the field of transportation, steel structures are used as track support frames for subway and light rail systems to ensure track stability and withstand the operating pressure of trains. In addition, steel structures are commonly used in the steel ceilings of some large shopping malls and balcony railings in residential areas to enhance durability and safety.

High strength and light weight: Steel structures have high material strength, small cross-section, and light weight, making them easy to transport and install. This characteristic enables steel structures to reduce foundation costs and accelerate construction speed in buildings.   Good plasticity and toughness: Steel structures have good plasticity and toughness, suitable for working environments with impact and dynamic loads. This characteristic enables steel structures to perform outstandingly in natural disasters such as earthquakes and typhoons, and can avoid collapse damage to buildings.   Easy to manufacture and install: The manufacturing process of steel structures is highly mechanized, with fast construction and easy quality assurance. Adopting factory prefabrication and on-site installation methods, the construction speed is faster and the construction period is shorter than traditional buildings.   Economy: Although the initial investment cost of steel structures is relatively high, their maintenance cost is low, their service life is long, and they have a high cost-effectiveness. The indoor effective usable area of steel structure residential buildings has increased by about 6%, with significant energy-saving effects. The walls are made of lightweight energy-saving standardized materials, which have good insulation performance and high seismic resistance.   Environmental Protection: Steel can be recycled and reused without causing pollution to the environment, which meets the requirements of sustainable development. During the demolition of buildings, most materials can be reused or degraded without generating garbage.   Wide applicability: Steel structures are suitable for various types of buildings, including residential, commercial, industrial, agricultural, and other fields. Steel structure factories are widely used in construction industries such as large-span industrial plants, warehouses, cold storage facilities, high-rise buildings, office buildings, multi story parking lots, and residential buildings.   Other advantages: Steel structures have good thermal insulation performance and sound insulation effect, which improves the comfort of buildings. In addition, the integration of design, production, and construction of steel structures has improved the level of the construction industry.