A Detailed Explanation of the Components of Steel Structures

Function: To support vertical loads + a portion of horizontal forces; serves as a vertical load-bearing component, transferring loads from beams and floor slabs down to the foundation. Key Considerations: Foundation connections and column base design.

Common Cross-Sections: H-section columns (most common), box columns (for high-rise buildings or heavy loads), circular tubular columns, cruciform columns, and lattice columns.

Classification:

• Edge columns, interior columns, and corner columns.
• Frame columns, trestle columns, and wind-resisting columns.

Function: To connect steel columns and support floor or roof loads; serves as a horizontal load-bearing component, receiving loads from floor slabs and roofing systems and transferring them to the columns.

Common Types:

1. Main beams and secondary beams.
2. Crane Beams: Used in industrial plants equipped with overhead cranes; they directly support crane loads and require extremely high strength and rigidity.

• Solid-Web Beams: H-section steel beams, welded H-section beams.
• Open-Web Beams: Cellular beams, truss beams.
• Roof beams, crane beams (common in industrial plants), frame beams, main/secondary beams, and tie beams.

Function: To provide load-bearing support for large-span roofs or ceilings; constructed from individual members arranged in a triangular system, offering the advantages of light self-weight and large spanning capability.

Applications: Industrial plants, warehouses, gymnasiums, aircraft hangars, and bridges.

Components: Top chords, bottom chords, and web members (vertical members + diagonal members).

Commonly used in industrial plants (trapezoidal steel roof trusses) and most prevalent in light steel structure facilities. The beams and columns are rigidly connected to form a unified, integral structural system. This configuration offers excellent overall structural performance and facilitates rapid construction. Features include large spans (potentially reaching 20–60m+) and high economic efficiency.

• Positioned atop roof trusses or beams to support the roof panels.
• Common types: C-shaped steel purlins and Z-shaped steel purlins.

Support exterior wall panels and form the wall framework. Positioned between the main columns.

• Column Bracing: Arranged vertically to enhance longitudinal stiffness (X-type, V-type).
• Roof Horizontal Bracing: Located between the upper and lower chords of roof trusses to provide horizontal stiffness.

Function: Resists wind and seismic forces, and prevents lateral structural displacement.

• Stiffeners: Prevent plate buckling and reinforce structural joints.
• Tie Rods: Transmit horizontal forces and connect individual main structural frames.
• Knee Braces: Prevent instability in purlins and beam flanges.
• Sag Rods / Struts: Secure purlins, ensure alignment, and prevent component instability.
• Scissor Bracing: Prevents local instability within structural components.

Function: Enhances component stability and prevents lateral instability in purlins.

Non-load-bearing; serves solely for enclosure, thermal insulation, waterproofing, and aesthetic purposes.

• Roof Panels: Profiled color-coated steel sheets, sandwich panels (EPS / Rock Wool / Glass Wool / PU / PIR), corrugated steel sheets / trapezoidal steel sheets / insulated sandwich panels for industrial buildings; wall panels and roof panels can be customized according to project requirements.
• Waterproofing: Self-adhesive membranes, sealants, ridge caps.

Insulation wool, skylight strips, roof ventilators, ridge caps, gutters (galvanized / stainless steel), downspouts, rain heads.

• Exterior Wall Panels: Exterior cladding panels—similar in material to the roofing—providing insulation, fire resistance, and corrosion protection.
• Door and window trims, corner trims, finishing trims, flashing, window sills, canopy panels.

• Steel floor decking + composite concrete slabs; typically used in multi-story steel-framed buildings.

• Windows: (Aluminum alloy windows / PVC windows / Industrial louvers)
• Doors: (Industrial lift doors / Sliding doors / Rolling shutter doors / Hinged steel doors / Sectional rolling doors / Customizable steel doors / Standard steel doors / Sandwich panel doors)
• Ventilators, rainwater drainage systems, fire-retardant coatings, anti-corrosion finishes.
• MEP (Mechanical, Electrical, and Plumbing), fire safety systems, flooring, etc. (typically part of the general civil works).

• Self-tapping screws, blind rivets.
• Sealants, foam fillers, waterproofing tapes.
• Non-load-bearing; serves solely for enclosure, insulation, waterproofing, and aesthetic purposes.

Structural components must be reliably connected, as this directly determines the structural safety of the building. Components include: gusset plates, stiffener plates, and connection plates.

• Common Methods: Submerged Arc Welding (SAW), Gas-Shielded Arc Welding (GMAW/FCAW), Shielded Metal Arc Welding (SMAW)
• Forms: Butt Welds, Fillet Welds

• Ordinary Bolts: Grade C bolts, used for secondary connections
• High-Strength Bolts: Friction-type and Bearing-type; used for critical nodes in the main structure; primarily installed on-site; offer rapid construction and controllable quality
• Anchor Bolts: Connect steel columns to concrete foundations
• Gusset Plates (critical components connecting bracing, beams, and columns), Connection Plates, Stiffener Plates

Now rarely used; primarily found in older structures or specialized heavy-load bridges.

Foundations and Embedded Parts: The base of the steel column connects to the concrete foundation via the column base, anchor bolts, and base plate, thereby transferring loads to the underlying soil/ground. (Although technically not part of the steel structure itself, it is an essential interface that must be fully coordinated.)

• Isolated Footings / Strip Footings / Pile Foundations
• Supports the entirety of the superstructure loads

Configured according to specific project requirements:

• Fire Protection System: Fire-retardant coatings / Encapsulation
• Corrosion Protection System: Galvanizing / Painting (including rust removal, primer, and topcoat)
• Drainage System: Gutters, Downspouts
• Ventilation System: Roof Monitors, Exhaust Fans
• Crane System: Crane Girders, Rails
• Stairs, Platforms, and Railings: Steel Stairs, Checkered Steel Plate Platforms