In the construction of steel structure sports venues, the following aspects need to be considered:

1. Structural Design Aspects

Reasonable spatial layout and structural selection

Consideration of functional requirements: The functions of sports venues are diverse, including competition areas, spectator stands, athlete rest areas, equipment rooms, and other different zones. When designing, it is essential to fully consider the spatial needs of these functional areas, their interrelationships, and the flow of people. For example, the size and shape of the competition area must meet the competition standards of the respective sports, and the sightline design of the spectator stands must ensure that spectators can clearly watch the competition.

Optimization of structural selection: Choose an appropriate steel structure system based on factors such as the scale, span, and height of the sports venue. For large-span sports venues, such as the competition hall of a large stadium, options include spatial grid structures, arch-supported dome structures, or tensioned beam structures. These structural forms can effectively span larger spaces and have good load-bearing performance. At the same time, consider the economic aspect of the structure, aiming to reduce the amount of steel used and project costs while meeting mechanical performance and architectural functions.

Load values and combinations

Types of loads: The steel structure of sports venues needs to consider various loads, including dead loads (such as the weight of the steel structure, roof, and wall materials), live loads (such as spectator crowd loads, competition equipment loads, snow loads, etc.), wind loads, and seismic loads. For spectator crowd loads, reasonable values should be determined based on the number of seats and the nature of use of the sports venue. Generally, the live load value for spectator stands is 3-5 kN/m², while the live load for competition areas varies by sport; for example, the live load for a basketball court can be around 5 kN/m².

Load combination principles: Correctly combine loads according to building structure load specifications. Under different working conditions (such as normal use, seismic effects, wind disasters, etc.), consider the most unfavorable load combination scenarios. For example, when considering the combination of wind loads and snow loads, analyze the combined effects of wind direction and snow accumulation to ensure that the steel structure has sufficient safety reserves under various possible load combinations.

2. Steel Structure Fabrication and Installation

Quality control of steel materials

Material selection: Choose appropriate types and models of steel according to design requirements. Commonly used steel materials for sports venue steel structures include low-alloy high-strength structural steels such as Q345B and Q390. The steel should have good mechanical properties, welding performance, and corrosion resistance. When purchasing steel, strictly check the quality certification documents, including the chemical composition and mechanical performance test reports, to ensure that the steel quality meets national standards.

Material inspection: Conduct sampling inspections of incoming steel materials, checking for size deviations, appearance quality (such as cracks, delamination, and other defects), and mechanical properties. For example, use tensile tests and impact tests to detect indicators such as yield strength, tensile strength, and toughness of the steel. Steel that does not meet requirements is strictly prohibited from being used in steel structure fabrication.

Precision in steel structure fabrication

Cutting and processing precision: During the fabrication of steel structures, the cutting precision of steel plates and sections directly affects the dimensional accuracy of components. Use advanced cutting equipment, such as CNC flame cutting machines or plasma cutting machines, to ensure the flatness and dimensional accuracy of the cut surfaces. For example, the dimensional deviation of cut parts should be controlled within ±1mm. For processed components, strict dimensional checks should be conducted, ensuring that deviations in length, width, height, and angles meet design and specification requirements.

Welding quality control: Welding is a key process in steel structure fabrication. Choose appropriate welding processes and materials, determining welding parameters based on the material of the steel and the thickness of the components. During welding, strictly control the welding quality to avoid defects such as porosity, slag inclusion, incomplete penetration, and cracks. After welding is completed, conduct non-destructive testing, such as ultrasonic testing and radiographic testing, to ensure that the weld quality meets design and specification requirements.

Key points for steel structure installation

Foundation acceptance and positioning: Before installing the steel structure, the foundation must be accepted. Check whether the dimensions, elevation, axis positions, and concrete strength of the foundation meet design requirements. The positioning accuracy of the foundation directly affects the installation quality of the steel structure; for example, the deviation of the foundation centerline should be controlled within ±5mm, and the elevation deviation should be controlled within ±3mm. Use high-precision measuring instruments, such as total stations and leveling instruments, for measuring and positioning the foundation.

Installation sequence and temporary supports: Develop a reasonable installation sequence based on the structural form of the steel structure and the conditions of the installation site. For large-span steel structure sports venues, block or segment lifting methods are usually adopted. During the installation process, set up a temporary support system to ensure the stability of the steel structure before a stable structural system is formed. The arrangement of temporary supports should be designed according to the load characteristics of the structure, and the strength and stiffness of the supports should meet the load requirements during the construction phase.

3. Fire Protection and Corrosion Prevention

Fire protection design and measures

Fire resistance limit requirements: As a public building with a high density of people, the fire protection performance of the steel structure in sports venues is crucial. Determine the fire resistance limits of each component of the steel structure according to building design fire protection specifications. For example, the fire resistance limit for the load-bearing steel structure of a sports venue should generally not be less than 1.5-2.0 hours. Based on the fire resistance limit requirements, choose appropriate fire protection methods, such as fire retardant coatings or fireproof board coverings.

Fire retardant coating application: If fire retardant coatings are used for fire protection of the steel structure, pay attention to the selection of coatings, construction processes, and quality control. Fire retardant coatings should have good adhesion, weather resistance, and fire protection performance. Before construction, clean and de-rust the surface of the steel structure to ensure that the coating can adhere firmly. During construction, control the coating thickness and application intervals according to the coating's usage instructions to ensure the fire protection effectiveness of the fire retardant coating.

Corrosion prevention treatment

Corrosion prevention design: Consider the usage environment of the sports venue (such as indoor and outdoor environments, humidity, atmospheric corrosiveness, etc.) to develop a reasonable corrosion prevention design plan. For outdoor steel structures, focus on rust prevention, using measures such as hot-dip galvanizing and epoxy zinc-rich primers. For indoor steel structures, appropriate corrosion prevention treatments may also be necessary, such as applying anti-corrosion paint.

Corrosion prevention construction quality: During the corrosion prevention construction process, ensure that the quality of corrosion prevention materials and construction processes meet requirements. For hot-dip galvanizing, control the thickness and uniformity of the galvanized layer; for painting, ensure the thickness and integrity of the paint film. Regularly inspect the condition of the corrosion prevention coating on completed steel structures and promptly repair any damage found.

4. Roof and Wall Systems

Roof waterproofing and drainage

Waterproof design: The roof area of sports venues is large, and waterproof design is key. Choose suitable roofing waterproof materials, such as polymer waterproof membranes and metal roofing panels. For metal roofing panels, pay attention to their panel design and connection methods to ensure the waterproof performance of the roof. For example, using interlocking or edge-locked metal roofing panel connections can effectively prevent rainwater leakage.

Drainage system design: Reasonably design the roof drainage system, including drainage slope, gutters, and rainwater outlets. The roof drainage slope should generally not be less than 2% to ensure smooth drainage of rainwater. The design of the gutter should consider its capacity, drainage ability, and connection with the rainwater outlet. The number and position of rainwater outlets should be determined based on the roof area and rainfall, to avoid water accumulation on the roof.

Insulation and thermal insulation of wall systems

Selection of insulation materials: Choose suitable wall insulation materials based on the energy-saving requirements of the sports venue. Common insulation materials include expanded polystyrene foam boards (EPS), extruded polystyrene foam boards (XPS), and rock wool boards. When selecting insulation materials, consider their insulation performance, fire resistance, and water absorption rate. For example, rock wool boards have good insulation and fire resistance, making them suitable for walls of sports venues with high fire safety requirements.

Thermal insulation measures: In addition to insulation materials, some thermal insulation measures can also be adopted to reduce energy consumption inside the sports venue. For instance, setting up shading facilities on the outer side of the walls, such as sunshades and awnings, can reduce the influx of solar radiation heat. At the same time, attention should be paid to the sealing of the wall system to prevent heat exchange and air infiltration.