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AS 4100 Prefabricated Box Section Portal Frame Rafter for Australian Industrial Workshop
| Place of Origin | China |
|---|---|
| Brand Name | FASEC |
| Certification | AS 4100 Compliant Design; AS/NZS 3678 / AS 1163 Material Compliant |
| Model Number | Steel Truss |
| Minimum Order Quantity | 100 MT |
| Price | USD 1,000-1,500/MT |
| Packaging Details | Sea Freight (Container/Bulk Vessel) |
| Delivery Time | 10-30 Days |
| Payment Terms | L/C, D/A, D/P, T/T |
| Supply Ability | 2,000 – 5,000 MT/month |
Product Details
| Application | Australian Industrial Workshops, Large Clear Spans, Heavy Crane Loads | Design Standard | AS 4100 (2020) – Limit States Design (ULS + SLS) |
|---|---|---|---|
| Design Method | 1st & 2nd Order Elastic Analysis; Section Capacity, Member Buckling And Combined Load Effects Verified | Section Type | Welded Closed Rectangular Box Section |
| Steel Grade | Grade 300 / Grade 350 To AS/NZS 3678 (plate) / AS 1163 | Welding Standard | AS/NZS 1554.1; SAW For Longitudinal Main Welds; GMAW/FCAW For Attachments; WPS/PQR Qualified |
| Connection | High-strength Bolted Site Connection; No Field Welding | Customization | Customized To Project Requirements |
Product Description
The AS 4100 Prefabricated Box Section Portal Frame Rafter is a certified structural beam tailored for Australian industrial workshops requiring large clear spans and heavy overhead crane loads. Designed in accordance with AS 4100 adopting Limit States Design methodology, the welded closed box section provides superior bending capacity and torsional stability compared with conventional open H/I beams. All components are fully prefabricated off-site with bolted joints, enabling rapid erection and satisfying local building regulatory requirements across Australia.
Design & Performance Highlights
Full AS 4100 Compliance: Limit States Design (ULS + SLS), elastic structural analysis, member buckling verification, welding executed to AS/NZS 1554.1- Box Section Unique Merits: Closed profile effectively resists twisting force, perfectly suited for eccentric crane loads; excellent biaxial stiffness reduces demand for lateral bracing, applicable for bridge cranes up to 50t+
- Long-term Durability: Enclosed inner surfaces minimise corrosion risks; guaranteed 50+ years design life under proper maintenance
Technical Specifications
| Parameter | Specification |
|---|---|
| Design Standard & Method | AS 4100 (2020) – Limit States Design (ULS strength + SLS deflection); 1st & 2nd order elastic analysis; section capacity, member buckling and combined load effects verified following AS 4100 clauses |
| Section & Dimensions | Welded closed rectangular box section; depth: 600mm–2,500mm; flange thickness:12mm–50mm; web thickness:8mm–30mm, fully customised based on span and load conditions |
| Span & Steel Grade | Single span: 20m – 50m+, multi-span layout available; Grade 300 / Grade 350 steel to AS/NZS 3678 (plate) / AS 1163; yield strength varies by plate thickness |
| Welding & Connection | Fabricated to AS/NZS 1554.1; SAW for longitudinal main welds, GMAW/FCAW for attachments; all WPS/PQR qualified. High-strength bolted site connection, no field welding and less weather impact |
| Crane Capacity & Surface Treatment | Compatible with bridge cranes up to 50 tonnes; protection options: two-coat epoxy paint / hot-dip galvanizing / weathering steel. Sealed inner surfaces lower ongoing maintenance cost |
| Design Life & Documents | 50+ years design life. Complete compliance package: design calculation reports, MTRs, WPS/PQR, NDT records (UT for full penetration welds, MT for fillet welds), coating reports and as-built drawings |
Fabrication & Quality Assurance
Raw Material: Certified Grade 300/350 steel plates with complete Mill Test Reports- NDT Inspection: Ultrasonic Testing (UT) for full-penetration butt welds; Magnetic Particle Testing (MT) for fillet welds
- Camber Treatment: Pre-set camber to counteract dead-load deflection
- Surface Preparation: Abrasive blasting to AS 1627.4 standard prior to epoxy coating or galvanizing
- Third-party Audit: Independent inspection available via SGS, Bureau Veritas or client-designated surveyors
Installation Benefits
Prefabricated units come with reserved lifting lugs, ready for direct hoisting and erection- All joints adopt bolted connection: no on-site welding, construction less affected by weather
- Parallel construction: steel fabrication proceeds simultaneously with foundation work, cutting project timeline by up to 40%
- Reduced on-site operations, ideal for compact sites or facilities staying in operation during construction
Concluion
The AS 4100 Prefabricated Box Section Portal Frame Rafter delivers certified structural performance, fast erection and reliable durability for Australian industrial workshops. Fully compliant with Australia’s primary steel construction standard, it accommodates heavy crane loads and long clear-span requirements for intensive industrial operations, with comprehensive technical documentation to support local building approval.
Share your project data including span, crane capacity and layout requirements. Our team will supply AS 4100-compliant design, workshop drawings and formal quotation within 48 hours. Certified to Australian standards — your industrial workshop structural solution starts here.
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