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Views: 0 Author: Site Editor Publish Time: 2026-09-14 Origin: Site
Long-span steel structures are widely used in airports, railway stations, exhibition centers, stadiums, industrial plants, warehouses, aircraft hangars, logistics centers, and other buildings that require large column-free spaces.
In long-span structural design, the arrangement of supporting points has a significant influence on architectural flexibility and structural performance. Generally, the more dispersed the supports are, the greater the restrictions on floor planning and spatial organization. In contrast, structures with more concentrated supporting points can often provide greater flexibility for architectural design and interior space utilization.
Depending on the span, building function, load requirements, architectural form, and construction conditions, different structural systems and installation methods can be adopted.
This article introduces the main types of long-span steel structures and the most commonly used construction methods.
A space frame is a three-dimensional structural system composed of multiple members connected through nodes according to a specific geometric arrangement.
Double-layer or multi-layer flat grid systems are commonly referred to as space frame structures. They are typically fabricated from steel tubes, hollow sections, or structural steel profiles.
Common space frame configurations include:
Space frames composed of planar truss systems
Square-pyramid space frames
Triangular-pyramid space frames
Hexagonal-pyramid space frames
Space frame systems offer several important advantages for large-span buildings:
Excellent three-dimensional load distribution
Clear and efficient load-transfer paths
High structural stiffness
Relatively low structural weight
Good seismic performance
Convenient fabrication and installation
Standardized members and connection nodes
Suitable for factory prefabrication and mass production
Flexible architectural layout
Easy integration of ceilings, pipelines, HVAC systems, and other building services
Lightweight and attractive architectural appearance
Because of these advantages, steel space frames are commonly used for exhibition halls, transportation terminals, sports facilities, industrial buildings, and large public buildings.
A grid shell is a curved spatial grid structure. Depending on the structural arrangement, it can be designed as a single-layer grid shell or double-layer grid shell.
Grid shell structures may be constructed using steel, timber, reinforced concrete, or composite materials. Steel grid shells are particularly suitable for large-span buildings because of their high strength-to-weight ratio and fabrication flexibility.
Common forms include:
Spherical grid shells
Cylindrical grid shells
Hyperbolic grid shells
Hyperbolic paraboloid grid shells
Double-curved grid shell systems
Grid shell structures combine the characteristics of lattice structures and shell structures.
Their key advantages include:
Efficient structural behavior
High overall stiffness
Excellent long-span capability
Relatively simple structural members
Small components can be assembled into very large structures
Members and nodes can be prefabricated in factories
Convenient modular installation
Reduced demand for heavy lifting equipment in some projects
Attractive and flexible architectural forms
Grid shells can be designed into a wide variety of curved surfaces, making them suitable for stadiums, arenas, exhibition centers, transportation hubs, atriums, and landmark buildings.
A membrane structure, also known as a tensile fabric structure, is a lightweight long-span structural system developed extensively during the twentieth century.
It uses high-performance flexible membrane materials combined with air pressure, steel cables, or rigid supporting structures. By introducing appropriate prestress into the membrane surface, the structure develops sufficient stiffness to cover large spaces.
The main membrane structural systems include:
Air-supported membrane structures
Tensile membrane structures
Frame-supported membrane structures
The main characteristics include:
Extremely low self-weight
Excellent long-span capability
Flexible architectural design
Fast installation
Reduced structural material consumption
Good economic performance
High visual impact
Good natural light transmission depending on the membrane material
Suitable for irregular and free-form architecture
Membrane systems require careful consideration of material durability, prestress control, wind loads, drainage, connection details, and long-term maintenance.
They are widely used for stadium roofs, transportation facilities, entrance canopies, commercial complexes, outdoor venues, and public spaces.
Cable-supported structures use high-strength steel cables as the primary tension-resisting elements.
A typical suspended roof system consists of:
Cable system
Roof system
Supporting system
Common configurations include:
One-way single-layer cable structures
Radial single-layer cable structures
Two-way single-layer cable structures
One-way double-layer prestressed cable structures
Radial prestressed cable structures
Two-way double-layer prestressed cable structures
Prestressed cable-net structures
The primary advantage of cable structures is their highly efficient use of steel.
Under ideal conditions, cables mainly resist loads through axial tension, significantly reducing bending and shear effects.
Other advantages include:
High material efficiency
Very low structural self-weight
Excellent long-span capability
Flexible structural arrangement
Suitable for various architectural layouts
Reduced demand for large structural members
Distinctive architectural appearance
However, cable-supported structures require advanced structural analysis. Prestress levels, geometric nonlinearity, construction sequence, wind-induced vibration, and deformation control must all be carefully evaluated.
Thin shell structures are curved structural systems that transfer loads primarily through membrane forces.
In engineering practice, a shell with a relatively small thickness compared with its radius of curvature is generally classified as a thin shell.
According to their geometric form, shell structures can include:
Rotational shells
Translational shells
Cylindrical shells
Spherical shells
Double-curved shells
According to materials, they may include:
Steel thin shells
Reinforced concrete shells
Masonry shells
Composite shell structures
Thin shell structures provide excellent load-bearing efficiency because their geometry allows loads to be transferred through membrane action rather than primarily through bending.
Key benefits include:
High structural strength
High stiffness
Excellent material efficiency
Large-span capability
Reduced material consumption
Attractive architectural appearance
The combination of structural efficiency and architectural flexibility makes shell structures suitable for stadiums, terminals, halls, exhibition buildings, and landmark projects.
The construction method for a large-span steel structure should be selected according to structural type, span, building height, site conditions, lifting capacity, structural stability, safety requirements, and project schedule.
The following methods are commonly used.
High-altitude in-situ assembly involves installing structural members and connection nodes directly at their final design positions.
During construction, temporary supports are often required to maintain structural stability and control deformation. After the entire structural system is completed and stabilized, the temporary supports are gradually removed so that the structure can enter its final designed stress condition.
This method is considered one of the most fundamental installation methods for complex large-span spatial steel structures.
Depending on the temporary support system, it can generally be divided into two methods.
A full-support scaffold is erected according to the geometry and elevation of the structure, allowing structural components to be assembled at their final positions.
It is suitable for buildings with moderate height and span.
Its advantages include:
Flexible construction
Easy positioning and alignment
Relatively economical for suitable projects
Temporary scaffolding can often be reused
Possible disadvantages include:
Large quantity of scaffolding required
More work at height
Increased safety-management requirements
Longer temporary-support installation period
Temporary steel support frames are specially designed according to the geometry, loads, and installation sequence of the steel structure.
This method is suitable for structures with greater height, larger spans, and heavier components.
Advantages include:
Higher construction stability
Better coordinate and elevation control
Flexible support-frame design
Suitable for heavy large-span structures
However, temporary support frames may involve higher fabrication costs and lower reuse rates.
The sliding installation method involves assembling sections of the steel structure in an accessible area and then moving them along specially designed tracks to their final positions.
After each section reaches the designated location, it is connected to the previously installed structure.
This method is particularly useful where the construction site has limited access or where lifting operations directly above the final installation area are difficult.
It is often used for:
Stadium roofs
Exhibition buildings
Transportation terminals
Industrial buildings
Regular polygonal buildings
Large structures with restricted construction space
Reduced high-altitude assembly work
Shorter installation period
Improved construction efficiency
Lower dependence on large lifting equipment in certain conditions
Engineering teams must carefully control:
Sliding track design
Support reactions
Synchronization of sliding equipment
Sliding speed
Structural deformation
Temporary stability
Final positioning accuracy
Overall lifting involves assembling a large section—or sometimes the entire roof structure—at or near ground level and then lifting it to the final design elevation using synchronized lifting equipment.
This method is commonly used for:
Space frame roofs
Grid shell roofs
Large industrial roof structures
Stadium roofs
Exhibition halls
Significant reduction in high-altitude assembly work
Reduced temporary support requirements
Improved construction safety
Shorter installation time
Better ground-level fabrication and quality control
The major technical challenges include controlling:
Lifting-point locations
Synchronization between lifting devices
Structural stress during lifting
Deformation during lifting
Temporary structural stability
Before lifting, detailed structural simulation and construction-stage analysis are normally required.
The overall tensioning method is mainly used for cable structures and tensile membrane structures.
A number of hydraulic jacks or specialized tensioning devices are used to apply controlled tension to cables until the required prestress level and structural elevation are achieved.
It is particularly suitable for large cable-supported roofs and tensile membrane structures.
Efficient prestress application
Accurate control of cable forces
Reduced high-altitude manual work
Lower labor requirements
Improved construction efficiency
Suitable for synchronized installation
Because cable and membrane structures are highly sensitive to prestress, tensioning operations should be carefully monitored to ensure that force levels, structural geometry, and deformation remain within design tolerances.
The progressive expansion method is an advanced installation technique frequently applied to large grid shell structures.
The basic procedure is:
Assemble the central section of the grid shell at ground level.
Lift the assembled section to a predetermined height.
Install additional surrounding structural sections.
Lift the enlarged structure again.
Repeat the process until the complete grid shell has been assembled.
This method can provide several benefits:
Reduced temporary support requirements
More assembly work can be completed at ground level
Improved welding and connection quality
Reduced work-at-height risks
Better construction safety
Easier quality inspection
Suitable for very large spatial structures
Because of these advantages, progressive expansion installation is increasingly considered for complex long-span steel grid shell projects.
In the cantilever installation method, relatively small structural units are prefabricated or assembled at ground level and then lifted directly into position.
New structural units are installed progressively from the completed portion of the structure.
This method is generally suitable for relatively small or structurally simple spatial steel structures.
Fewer temporary supports
Reduced temporary works
Potential reduction in construction cost
Flexible installation sequence
However, construction-stage stability is critical.
The previously installed structure must have sufficient stiffness and geometric stability before additional members can be installed.
Potential risks include:
Excessive temporary deformation
Construction-induced secondary stresses
Instability of incomplete structural systems
Difficult alignment control
Higher safety requirements during erection
Therefore, structural simulation and construction-stage analysis should be completed before adopting the cantilever installation method.
There is no single construction method suitable for every long-span steel structure.
The installation strategy should be determined according to the specific project conditions.
Important factors include:
Structural system
Building span and height
Steel tonnage
Component dimensions
Site accessibility
Crane capacity
Available assembly area
Temporary support conditions
Construction schedule
Local weather conditions
Transportation restrictions
Safety requirements
Structural deformation limits
Installation accuracy requirements
For complex projects, multiple construction methods may be combined.
For example, part of a roof structure may be assembled at ground level, lifted as a large unit, and then completed through high-altitude assembly.
Detailed construction simulation, lifting analysis, temporary support design, and deformation monitoring are essential for ensuring structural safety.
Long-span steel structures provide significant advantages for buildings that require large open spaces, architectural flexibility, high structural efficiency, and reduced internal columns.
Common structural systems include space frames, grid shells, tensile membrane structures, cable-supported structures, and thin shell structures.
Depending on project requirements, construction can be completed through high-altitude in-situ assembly, sliding installation, overall lifting, synchronized tensioning, progressive expansion, or cantilever erection.
The success of a long-span steel structure project depends not only on structural design, but also on fabrication accuracy, connection quality, temporary stability, lifting control, installation sequencing, and construction-stage engineering.
ZSJH STEEL provides integrated steel structure solutions for industrial, commercial, and large-span construction projects.
Our services can include:
Structural steel fabrication
Custom steel structure manufacturing
Engineering detailing and shop drawings
BIM and 3D modeling support
Steel space frame and roof structure fabrication
Structural steel component supply
Welding and connection fabrication
Surface treatment and corrosion protection
Quality inspection
Export packaging
International logistics support
Installation and technical guidance
Whether your project involves a factory, warehouse, logistics center, exhibition hall, stadium, transportation facility, or another large-span steel building, our team can provide customized fabrication and supply solutions according to project drawings and technical requirements.
Have a long-span steel structure project? Send us your drawings, specifications, and project requirements for technical evaluation and quotation.
