Steel structure is a structure composed of steel materials and is one of the main types of building structures. Steel beams, columns, trusses, and other components mainly made of steel sections and plates, are usually connected by welds, bolts, or rivets between each component or part.

High strength and light weight: Steel has high strength and elastic modulus, so the cross-section of steel structural components is small and the self weight is light.

Good plasticity and toughness: Steel has good plasticity, and steel structures generally do not suddenly fracture or fail due to accidental or local overloading. Steel has good toughness, making steel structures more adaptable to vibration loads.

High degree of industrialization: Steel structural components are easy to manufacture in factories and assemble on construction sites. Mechanized manufacturing of steel structural components in factories has high precision, high production efficiency, fast assembly speed on construction sites, and short construction period.

Good sealing performance: The welded structure can achieve complete sealing, making high-pressure vessels, large oil tanks, pressure pipelines, etc. with good air and water tightness.

Good seismic performance: Steel structures have good seismic performance due to their light weight, low seismic action, and good toughness of steel, which can effectively dissipate seismic energy.

Poor corrosion resistance: Steel is prone to rusting in humid and corrosive environments, requiring regular maintenance and increasing maintenance costs.

Poor fire resistance: Steel is heat-resistant but not fire-resistant. When the temperature exceeds 250 ℃, the steel material undergoes significant changes, not only gradually reducing its strength, but also causing blue brittleness and creep phenomena. When the temperature reaches 600 ℃, the steel enters a plastic state and cannot continue to bear.

Relatively high cost: Compared with concrete structures, the cost of steel structures is relatively high.

Large span structures, such as sports halls, exhibition halls, aircraft hangars, etc.

High rise buildings: such as office buildings, hotels, residences, etc.

Industrial buildings: such as heavy machinery buildings, power plant buildings, etc.

Bridges: such as highway bridges, railway bridges, etc.

Tower and mast structures, such as television towers, microwave towers, etc.

Welding connection: Welding connection is the most important connection method for steel structures, with the advantages of simple construction, saving steel, convenient processing, and easy automation operation.

Bolt connection: Bolt connection is easy to install, especially suitable for installation and connection on construction sites, and also easy to disassemble, suitable for temporary connections that require installation and disassembly of structures.

Rivet connection: Rivet connection has reliable force transmission, good plasticity and toughness, but its structure is complex, requires a large amount of steel, and is difficult to construct. It is now rarely used.

Coating anti-corrosion: Applying anti-corrosion coating on the surface of steel is the most commonly used anti-corrosion method.

Hot dip galvanizing: immersing steel in molten zinc solution to form a layer of zinc iron alloy on its surface, which has good anti-corrosion properties.

Cathodic protection: By applying an external current or sacrificing the anode, the surface of the steel becomes a cathode, thereby inhibiting its corrosion.

Spraying fireproof coating: Spraying fireproof coating on the surface of steel can improve the fire resistance limit of steel structures.

Covering fireproof board: Covering fireproof board on the surface of steel can isolate the influence of flames and high temperature on the steel.

Pouring concrete: Pouring concrete outside the steel structure can improve its fire resistance limit.

The application of high-strength steel: High strength steel can reduce the cross-sectional size of components and decrease the amount of steel used, which is an important direction for the development of steel structures.

The application of new connection technologies, such as high-strength bolt connections and welding robots, can improve construction efficiency and quality.

The application of intelligent technology, such as BIM technology, Internet of Things technology, etc., can achieve full lifecycle management of steel structure design, manufacturing, installation, and operation and maintenance.

Qualification: Select enterprises with professional contracting qualifications for steel structures.

Experience: Choose enterprises with rich construction experience.

Performance: Choose companies with good performance.

Reputation: Choose a reputable enterprise.