Galvanized Steel Roof Truss Section - Warren Truss with Tubular Web Members & Bolted End Plate Connections for Large-Span Roofs

Target Keywords

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Brief Description

Hot-dip galvanized steel Warren roof truss section with rectangular chord members and tubular web struts. Factory-welded and bolted end plates enable modular assembly for large-span warehouse, factory, and arena roofs.

Detailed Description

This galvanized steel truss section is a modular component for long-span roof systems in industrial buildings, sports facilities, and commercial structures. Built in the Warren truss configuration - where alternating diagonal web members form a series of equilateral triangles between the top and bottom chords - it efficiently converts bending moments into axial tension and compression forces in the members. The bottom chord is a continuous rectangular hollow section (RHS) beam, while the top chords are two angled RHS members meeting at a central peak to form the roof pitch. Four round tubular steel struts serve as internal web members, welded into the chord joints for clean, efficient load transfer. Both ends of the truss section feature bolted end plates: 5-bolt pattern on the left, 4-bolt pattern on the right - these connect to adjacent truss sections or supporting columns in the field. After fabrication, the complete truss undergoes hot-dip galvanizing in our 12.5m bath to ISO 1461 standards, providing 70-100μm of corrosion protection to all surfaces including the inside of tubular members. The Warren truss configuration is preferred for medium-span roofs (15-40m) because it uses less steel than a Pratt truss for the same load, and its clean geometric pattern is architecturally appealing for exposed ceiling designs. Each truss section ships with matched bolt kits, erection drawings, and full material traceability documentation.

Product Attributes

Product Selling Points

Efficient Warren geometry: The alternating diagonal pattern creates a pure axial-force truss - no bending in web members - which minimizes steel weight per meter of span vs Pratt or Howe configurations

Tubular web members: CHS (circular hollow section) struts have uniform buckling resistance in all directions and a 20-30% lower wind drag coefficient than angle sections - important for exposed roof structures

100% galvanized coverage: Complete single-dip HDG protects inside every tubular member, inside bolt holes, and inside chord-web joint intersections - areas paint can never reach

Modular bolted assembly: Truss sections arrive at site with pre-drilled end plates; a 3-person crew with a mobile crane can erect a 30m truss in under 2 hours - no site welding, no scaffolding for connection work

Pre-camber available: For deflection-sensitive applications (glazed roofs, long spans), we pre-camber the truss during fabrication so it deflects to level under dead load - verified by laser tracker

Company Advantages

Truss design expertise: Our engineers optimize member sizing and joint geometry using structural analysis software (STAAD/Tekla), often achieving 10-15% weight savings vs standard truss designs

In-house galvanizing: Our 12.5m HDG bath allows complete single-dip galvanizing of truss sections up to 12m, ensuring uniform coating inside tubular members - no missed spots

Modular fabrication approach: Trusses are built as transportable sections with bolted field splices, designed for container shipping and fast on-site assembly with mobile cranes

Complete roof kit capability: We can supply the full roof steel package - trusses, purlins, bracing, sag rods, and connection hardware - all pre-engineered for compatibility

Quality assurance: Every truss undergoes dimensional inspection (laser measurement of camber, span, and pitch) plus weld NDT and coating thickness verification before release

Frequently Asked Questions

Q1: Why choose a Warren truss over a Pratt truss for my roof?

A: Warren trusses use alternating diagonals forming equilateral triangles, which means all web members carry only axial loads (tension or compression) - no bending. This typically uses 10-15% less steel than a Pratt truss for the same span and load. Warren trusses also have a cleaner geometric appearance for exposed ceiling designs. We can fabricate any truss type - Warren, Pratt, Howe, or custom - based on your structural requirements.

Q2: How do you ensure the tubular web members are fully galvanized inside?

A: We drill vent and drain holes at the ends of every CHS member before galvanizing. During immersion, zinc flows through these holes to coat the internal surface. After galvanizing, we visually inspect internal coating with a borescope on a sample basis. This is a critical quality step that separates professional fabricators from general shops.

Q3: Can you supply the truss with a specific camber?

A: Yes. We pre-camber trusses for deflection compensation, typically 1/300 to 1/500 of the span. Camber is achieved by cutting the chord members with a calculated curve before assembly. Post-fabrication camber is verified with a laser tracker against the approved shop drawing.

Q4: What roof types can your trusses support?

A: Our trusses are designed for all common roof systems: single-skin metal sheet (trapezoidal or corrugated), insulated sandwich panels, standing seam systems, and even glazed skylight roofing. We adjust purlin spacing and truss stiffness based on the specific roof dead load and wind uplift requirements of your project location.

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