Our steel angle truss is the most cost-effective solution for small to medium-span construction. Engineered from high-strength structural angles, they offer an exceptional strength-to-weight ratio, specifically designed for agricultural and light industrial roofing. The fully bolted-joint design facilitates flat-pack shipping, significantly reducing ocean freight costs while ensuring rapid and precise on-site assembly.
To support you from drawing through delivery, we handle one place: 3D engineering and detailing in Tekla to AISC 360 / EN 1993-1-1 / GB 50017, CNC punching and drilling, CO2/argon welding and trial assembly, hot-dip galvanizing or Sa2.5-plus-painting, and flat-packed container shipment with numbered members - backed by a 24-hour quote.
Engineering Performance & Design Notes
This section explains how the angle truss carries load and how it is checked, so you can size and specify it with confidence.
Load model - dead, live, wind and snow on the roof plus any suspended loads; for an open-sided agricultural shelter the wind uplift on the underside is also checked per the target code.
Capacity check - each angle is checked for axial strength, local buckling of the legs and overall slenderness at its unsupported span; web angles that could draw in are braced by sag rods, purlins or the roofing plane.
Out-of-plane stability - the compression chord is restrained against lateral-torsional movement by purlins and the roof bracing system at their design spacing.
Serviceability - mid-span deflection held within L/200 for roofs (L/240 when a ceiling or brittle cladding is present), and L/1000 for the straightness of each fabricated member.
Connection - gusset and base plates are sized and drilled by CNC so field bolts align with no re-drilling; when fully welded in-shop, joints follow AWS D1.1 fillet-weld proportioning.
Detailing - modeled in Tekla Structures; fabrication and erection drawings delivered for your sign-off, with camber applied where a long span requires it.
Specification of Steel Angle Truss
| Item | Detail |
|---|---|
| Material | Q235B, Q355B/C/D, ASTM A36, S355JR - hot-rolled structural angles |
| Span range | ≈6–24 m clear, single or multiple bays |
| Drawing support | PDF, DWG (AutoCAD), STEP, Tekla Structures |
| Processing | CNC punching, drilling, sawing, CO2/argon welding, trial assembly |
| Tolerance | Length ±2.0 mm; hole pitch ±1.0 mm; straightness L/1000 |
| Finishing | Hot-dip galvanized (ISO 1461); shot blasting Sa2.5 + painting |
| Application | Industrial plants, hangars, greenhouses, power towers, conveyor bridges |
Core Advantages of Steel Angle Truss
High strength-to-weight - triangulation turns roof bending into axial force, so it carries more with far less steel than a solid beam for its span.
Open profile = 100% galvanized coverage - unlike a hollow tube, the exposed angle section takes full hot-dip zinc, so there is no trapped-moisture internal corrosion to worry about.
Efficient bolted assembly - gusset-plated bolted joints build weld-free on site, cutting erection time and letting unskilled crews bolt roof panels sooner.
Flat-pack freight economy - the open truss nests compactly in a container, minimizing ocean freight while staying a standard hot-rolled profile that is the most economical material to buy.
Proven durability - every face is visible for easy inspection and re-coating, supporting a 30+ year service life in industrial and agricultural environments.
Applications of Steel Angle Truss
Industrial - warehouse and workshop roof framing where a light, open lattice truss keeps steel cost and column size down.
Agriculture - farm barn and poultry-house roofing; the fully galvanized open section handles humidity and wash-down exposure.
Civil - carports, sunshades and small canopies; bolted joints make them quick to erect and easy to relocate.
Temporary works - temporary shed roof support that can be flat-packed, re-erected and reused between sites.
Materials & Surface Treatment
| Grade | Typical use |
|---|---|
| Q235B | General frames and light roofs; economical secondary-grade structural steel. |
| Q355B / Q355C / Q355D | Higher-strength option for larger spans or heavier roof loads. |
| ASTM A36 | US-market carbon structural angle equivalent. |
| S355JR | European (EN) higher-strength structural angle equivalent. |
Surface Treatment
Hot-dip galvanizing (ISO 1461) - the open profile is fully covered; typical zinc layer 150 μm+ for 30+ years of rust protection in humid and agricultural exposure.
Shot blasting Sa2.5 + painting - for clean industrial interiors or a specified color profile; primer plus top coat over a Sa2.5-blasted surface.
Our Production Flow & Quailty Control
Production Flow
Material receiving - hot-rolled structural angles are checked against mill certificates for grade and dimensions.
Cutting & punching - angles are sawn to layout length and the gusset/joint holes are CNC-punched or drilled in the same flow.
Assembly & welding - members are dry-fitted in the assembly jig against the 3D model, then CO2/argon welded to fillet-weld detail.
Trial assembly - trusses are dry-erected to confirm bolt-hole alignment before finishing.
Finishing - hot-dip galvanized (partnered line) or shot-blasted and painted; then final inspection and packing.
Quality Control
1.Precision welding - uniform fillet welds with no slag or breaks to avoid stress concentration at every joint.
2.NDT integrity - ultrasonic testing (UT) identifies hidden internal flaws and verifies weld reliability.
3.Zinc layer control - digital gauges check zinc thickness to the 150 μm+ target.
4.Strength verification - mechanical testing confirms steel meets or exceeds the ASTM/ISO tensile and yield requirements.
Packing & Delivery of Steel Angle Truss
| Item | Detail |
|---|---|
| Packing | Space-saving nesting; high-strength steel strapping with protective padding against scratches. |
| Transportation | Engineered loading for 20'/40' international containers; forklift-friendly for fast unloading. |
| Lead time | 25–30 working days typical |
| Marking | Member number and heat number per bundle for site sorting. |
| Documents | Packing list, commercial invoice, mill certificates and coating certificates. |
FAQ:
When should I choose a steel angle truss over an H-beam or tube truss?
Angle trusses win on first cost and weight for small-to-medium spans around 6–24 m where the load is mostly roof dead and light snow/wind. H-section trusses suit 50-ton crane-heavy plants, and tube space trusses suit long curved spans. The open angle profile also lets hot-dip galvanizing reach 100% of the surface with no internal rust risk.
What span range can this angle truss cover?
As a standard triangular-lattice roof truss it is engineered for roughly 6–24 m clear spans and single or a few bays. Tell us span, bay spacing and roof loads and we confirm the angle sizes within 24 hours.
Is the joint bolted or welded, and do we weld on site?
Joints are engineered as bolted gusset connections for weld-free field assembly where flat-pack speed matters, or fully welded in-shop when specified. On a bolted scheme you tighten high-strength bolts on site and no structural field welding is needed.
Hot-dip galvanizing or shot-blasted painting?
The open angle section galvanizes cleanly to ISO 1461, so full zinc coverage suits humid, rural and agricultural exposure (150 μm+ typical). Shot blasting Sa2.5 plus paint suits clean industrial interiors or a specific color; we match the option to your environment class.
Do you take small projects of just a few trusses?
Yes, small-quantity orders are accepted - we do not force a large minimum. Shipment can be consolidated with other items or as a small flat-rack/high-cube container; lead time is confirmed per order.
