Trusses

 

 

Reference ranges drawn from our product line; final values are confirmed against your drawing and project specification at quotation.

 

Item	Typical range / capability
Available steel grades	Q235B / Q355B / Q355C&D, S355JR, ASTM A36 (higher grades, e.g. A572 Gr.50, on request)
Clear span	Angle: small–medium span · Tubular & space frame: up to 100 m+ / ultra-large clear span
Design loads (reference)	Wind 200 km/h · seismic intensity unit Z=4 · live load 50 kg/m² (per project code)
Fabrication tolerance	Length ±2.0 mm · hole pitch ±1.0 mm · straightness L/1000
Node connections	Bolted (angle) · welded tubular / space nodes via 5-axis CNC intersecting cutting
Surface protection	Hot-dip galvanized (zinc ≥150 µm) or shot blast Sa2.5 + paint
Quality inspection	UT weld inspection + dimensional / visual check per drawing
Drawings	PDF / DWG / STEP / Tekla Structures
Design service life	30+ years (galvanized, industrial & agricultural environment)

 

Our Steel Truss Manufacturing Equipment

 

Steel truss fabrication follows a cutting → assembly → welding → hole → finishing chain, and our key in-house equipment covers each step:

 

 

 

Type	Key features	Best for
Steel Angle Truss	Lightweight, high strength-to-weight; bolted flat-pack design; most economical material	Small–medium spans — factory roofs, workshops, sheds, greenhouses
Tubular Steel Truss	Up to 100 m+ spans, low wind resistance, clean AESS look	Stadiums, airport terminals, large warehouses, hangars
Steel Pipe Truss	High load capacity, reusable plug-in system, big clear spans	Large-span roofs, arenas, industrial plants, exhibition & temporary structures
H-Beam Truss	High rigidity and load capacity, good cross-section stability	Industrial frameworks, heavy plants, large buildings
Steel Roof Truss	Durable pitched roof framing	Commercial and industrial roof structures
Large-Span / Space Truss	Ultra-large clear span, no internal columns, light, uniform 3D load	Stadiums, exhibition halls, airport terminals, mezzanines
Long-Span Steel Truss	Engineered for column-free industrial and public spans	Long-span industrial roofs & public buildings

 

 

A steel truss is a triangulated framework of straight members connected at joints. Under load, every member carries only axial force — tension or compression — rather than bending. Because the members are arranged in triangles, the structure cannot change shape without changing member length, which is what makes it stable and exceptionally material-efficient over long spans.

 

Trusses are designed to withstand three groups of loads: live loads (people, furniture, equipment), dead loads (the structure itself), and environmental loads (wind, snow, seismic). Understanding which loads dominate your project is the first step in choosing the right truss.

 

 

 

 

Configuration		Load behaviour & key features	Best suited
Pratt Truss (N-configuration)		Diagonals slope toward the centre and are in tension under gravity load; highly steel-efficient for gravity-dominated roofs.	Gravity-dominated roofs and floors, spans of 20–100 m
Warren Truss (W / equilateral)		Repeating triangles, no vertical members in the pure form, even load distribution.	Open, evenly loaded spans; gantry and crane girders
Howe Truss		Diagonals slope outward with verticals in tension; less material-efficient for gravity but handles uplift load reversal well.	Roofs where uplift or reversed loads are critical (open buildings)
Fink Truss		Subdivided W-shaped web — economical and light.	Short-span, steep-pitched roofs (~8–20 m), light commercial
Space Frame (3D truss)		Interconnected planar trusses forming a 3D grid; extreme clear spans and biaxial load sharing.	Hangars, exhibition halls, stadium roofs, airport terminals

 

 

Every truss is engineered and checked in-house before fabrication:

 

 Connection verification: node details are matched to member design, with tubular joints verified per EN 1993-1-8.

 

 Complete load cases: live, dead and environmental (wind, snow, seismic) loads are combined at their worst, with uplift/wind-suction checked for open buildings.

 

 Deflection & camber: mid-span deflection is held within code limits, and pre-camber is applied where service deflection must be compensated.

 

 Steel efficiency: an economic depth-to-span ratio (≈1/10–1/15) keeps tonnage and cost in check.

 

 Durability planning: coating or galvanizing is selected by exposure category (C2–C5) to match service life.

 

Selecting a Configuration by Span & Load

 

Project situation	Recommended configuration
Gravity-dominated industrial roof, 20–100 m	Pratt truss
Evenly distributed load, open span, regular node spacing	Warren truss
Short span (8–20 m), steep roof pitch	Fink truss
Very large clear span, biaxial loading	Space frame / tubular space truss
Uplift or reversed-load critical (open buildings)	Pratt or Howe with uplift-oriented web

 

Not sure? Send your span, load and code — our engineers will recommend and size the configuration for you. [Get a free engineering consultation]

 

 

Cost driver	Effect	How to control
Span & depth	Longer span and shallower depth raise tonnage	Use an economic depth-to-span ratio (≈1/10–1/15)
Design load	Higher snow/wind/seismic/crane loads mean heavier members	Confirm realistic loads before detailing
Steel grade	Grade affects member size and price	High-strength grade on heavily loaded members can cut weight
Joining & detailing	Repetitive geometry and standard nodes save labour	Specify standard nodes; avoid over-fancy details
Finish	Paint vs galvanizing differ in price	Match to the actual exposure category
Quantity & schedule	Unit cost and freight vary with batch size	Batch orders; keep a realistic lead time

 

Send your [span, load, code and quantity] and we’ll return an itemised quotation so you can see — and control — each cost driver.

 

 

 

 

Every truss moves through a controlled sequence in our workshop, and quality is managed at each step — not checked once at the end. The table maps each fabrication stage to the control applied at that point.

                                                                           

Stage	Process	Quality control applied
1 · Incoming material	Steel plates, tubes and sections received under mill certificates.	Verify mill certs against spec; check dimensions, chemistry and mechanical properties; mark grade and heat/lot number for full traceability.
2 · Detailing & nesting	Shop drawings generated from the design; CNC nesting optimizes material yield.	Drawings checked against the design and code; nesting plan recorded for cutting accuracy.
3 · Cutting	CNC plasma/beam cutting and bevel preparation for weld joints.	Check cut dimensions, edge squareness, bevel angle and dross removal; tolerance per [code — confirm].
4 · Fit-up	Sub-assemblies, gusset plates and nodes set up and tack-welded on jigs.	Verify joint gaps, alignment and member positions against the shop drawing before welding.
5 · Welding	GMAW / FCAW (SMAW where needed) under controlled parameters.	Welds placed only by qualified welders per approved WPS/PQR; preheat and inter-pass temperature where specified; welding sequence chosen to control distortion.
6 · Non-destructive testing	Ultrasonic (UT) and/or magnetic-particle (MT) weld inspection.	NDT by IS0-9712-qualified operators; weld acceptance per the applicable code; rework is re-tested.
7 · Correction & pre-camber	Straightening of distortion; pre-camber applied where the design requires.	Verify straightness and camber against the elevation/tolerance requirements of the drawings.
8 · Pre-assembly / fitting	Trial assembly of truss segments and bolted-connection check.	Dimensional report of the trial assembly; confirm connection fit before surface treatment.
9 · Surface protection	Blast cleaning to Sa 2.5, primer/coating, or hot-dip galvanizing (e.g. Z200+) per exposure category.	Check blast profile and coating/galvanizing thickness per specification; inspect for coating defects.
10 · Final inspection & packing	Final QC, marking and protective packing.	Final dimensional check, QC report and marking; packing protects weld seams and surfaces for transport.

 

 

 

Element	Typical material
Main load-bearing chords/web	High-strength steel: Q355B / Q390B (equiv. S355/S390)
Secondary members & connections	Common structural steel: Q235B (equiv. S235)
Corrosion protection	Hot-dip galvanizing (e.g. Z200+), or coating system per exposure category (C2–C5)

Note:we design against applicable international codes (AISC 360, EN 1993 / EN 1090, GB 50017).

 

Quality Documents Your Inspector Receives

 

Every order ships with a QC package an inspector or third party can audit: material mill certificates, weld reports per WPS/PQR, NDT (UT/MT) results, pre-camber and dimensional report, and surface-treatment records. Where required, we define hold points for your or third-party inspection at [welding / NDT / final].

 

Design & Engineering Support

 

For export projects we support the engineering paperwork and we issue shop drawings plus DXF/IFC export for your CAD/BIM flow.

 

 

Steel trusses deliver column-free clearance, stable framing and efficient spanning across industry and infrastructure — from factory roofs to airport roofs.

 

Our Project Cases

 

 

 

Stage	Standard practice
Packaging	Bundled, steel-strapped and padded to protect weld seams and galvanized/coated surfaces; components grouped and marked for easy identification; flat-pack bolted designs nest to maximize container utilisation and cut sea freight.
Transport	Standard members shipped in 20'/40' containers as designed; over-length members fabricated in segments and field-spliced on site, with lifting and erection guidance supplied.
Lead time	Reference lead times from drawing sign-off to dispatch (industry norms — the final schedule is confirmed at order and varies with span, tonnage and surface treatment):    Standard / light trusses (angle, painted): ≈ 3–4 weeks  Large-span or heavy trusses (tubular, H-beam, welded): ≈ 5–8 weeks  Hot-dip galvanizing: +1–2 weeks
On-site support	Splicing and erection guidance supplied so members assemble correctly on site.

 

 

FAQ:

 

What depth-to-span ratio should my roof truss use?

 

For most roof trusses an economic depth is about 1/10–1/15 of the span. A deeper truss lowers member forces and steel tonnage but raises cladding and headroom cost, so we optimise the trade-off for your span and load and mark the chosen depth on the shop drawing.

 

Angle truss or tubular truss — which should I choose?

 

Angle trusses are the most economical for small–medium spans and ship flat to save freight; tubular and space trusses suit 60 m+ clear spans with lower wind resistance and a cleaner appearance. Your span, load and aesthetic decide it — the type table above maps this.

 

Can I review the shop drawings before fabrication?

 

Yes. We issue general-arrangement and shop drawings (PDF/DWG) for your review and approval before any cutting, and DXF/IFC export is available for your BIM workflow. Fabrication starts only after drawing approval, which also locks the schedule and price.

 

What quality documents ship with the trusses?

 

Each delivery is accompanied by material mill certificates, welding records, NDT (UT/MT) reports where specified, dimensional/trial-assembly reports and surface-treatment records — the dossier your inspector expects on site.

 

How does hot-dip galvanizing affect price and lead time?

 

Galvanizing adds roughly 1–2 weeks to lead time and a per-tonne surcharge, but it removes field touch-up and suits C3–C5 coastal or industrial exposure. For fully enclosed, mild environments painting is the economical alternative.

 

Why does the price differ so much between suppliers?

 

Mostly steel grade, connectivity and surface treatment. We price to transparent, budgetable material grades and give you an itemised breakdown — the cost section above lists what actually drives the number.

 

As one of the most professional trusses manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to buy customized trusses at competitive price from our factory. For quotation, contact us now.

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