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Donald McwayneGood team members always offer budget in time and answer questions with patience, great job! -
Joseph AlexanderI am feeling fully respected when taking with Grace and she always gave the best advice. The first batch of the bridge panels got are great too. thanks all.
Prefabricated Box Girder Steel Bridge | AASHTO LRFD20 & AWS D1.5M Certified
| Place of Origin | China |
|---|---|
| Brand Name | FASEC |
| Certification | ISO 9001; EN 1090-1 FPC; CE; AWS CWI; AISC IBR/ABR |
| Model Number | Steel Girder Bridge |
| Minimum Order Quantity | 100 MT |
| Price | USD 1,000-1,500/MT |
| Packaging Details | Sea Freight (Container/Bulk Vessel) |
| Delivery Time | 30-60 Days |
| Payment Terms | L/C, D/A, D/P, T/T |
| Supply Ability | 5,000-15,000 MT/Year |
Product Details
| Product Type | Custom Prefabricated Box Girder Steel Bridge | Design Standard | AASHTO LRFD Bridge Design Specifications |
|---|---|---|---|
| Welding Standard | AWS D1.5M Bridge Welding Code | Design Methodology | Load And Resistance Factor Design (LRFD) |
| Connection | High-strength Bolted (AISC 303) Or Field Welding Per AWS D1.5M | Surface Protection | Hot-dip Galvanizing (ASTM A123), Epoxy Paint, C3/C4 Coating |
| Customization | Span, Width, Girder Height, Material Grade, Deck System, Coating | Applications | Highway Overpass, Railway Crossing, Pedestrian Bridge, Heavy-load Industrial Access |
Product Description
Our Custom Prefabricated Box Girder Steel Bridge represents the pinnacle of modern steel bridge engineering—a fully integrated, shop-fabricated superstructure system designed to meet the most demanding infrastructure requirements. Combining the closed-section torsional efficiency of box girder geometry with modular prefabrication techniques, this bridge system delivers unmatched structural performance while dramatically reducing on-site construction time, labor costs, and traffic disruption. Every project is custom-engineered to client-specific span, width, and loading conditions, with full certification under the AASHTO LRFD Bridge Design Specifications and AWS D1.5M—the two most rigorous standards governing highway bridge design and welded steel fabrication in North America and beyond.
Design Standard: AASHTO LRFD Bridge Design Specifications
All bridge systems are designed and verified in strict accordance with the AASHTO LRFD Bridge Design Specifications, employing the Load and Resistance Factor Design (LRFD) methodology. This ensures that every structural component—from the top flange and web plates to the bottom tension flange and internal stiffeners—is precisely proportioned to resist all applicable load combinations, including dead load, live load (HL-93), fatigue, thermal effects, and seismic demands. Box girder cross sections are designed as trapezoidal tub sections per AASHTO LRFD Article 6.11, with diaphragms, cross frames, access holes, and lateral bracing provided as prescribed in Article 6.7 to ensure structural integrity and inspectability. Fatigue and fracture control provisions are rigorously applied—tension flanges in single-box cross sections are treated as fracture-critical members (FCMs) unless the bridge can be analytically demonstrated to sustain dead and live loads following a fracture event. Shear connectors are provided along the entire girder length per Article 6.11.10 to ensure full composite action with the concrete deck at the service limit state.
Welding Certification: AWS D1.5M Bridge Welding Code
Every weld in our prefabricated box girder system is executed and inspected under the AASHTO/AWS D1.5M/D1.5 Bridge Welding Code—the definitive standard jointly published by the American Welding Society (AWS) and AASHTO, governing all welded bridge fabrication using carbon and low-alloy constructional steels. The code applies to both shop and field fabrication, establishing comprehensive requirements for welding procedures, welder qualification, inspection protocols, and quality control. Clause 12 of the D1.5M code contains the specific requirements for fabricating fracture-critical members, mandating enhanced nondestructive testing (NDT) protocols including 100% ultrasonic testing (UT) on all FCM welds. Our fabrication facilities maintain full AWS D1.5M certification, with Certified Welding Inspectors (CWIs) overseeing every stage of production. The code’s stricter fatigue resistance and fracture control rules—distinguishing D1.5M from general structural welding codes like AWS D1.1—ensure that every weld detail is engineered to withstand decades of cyclic vehicle loading and environmental exposure.
Structural Composition & Mechanical Advantages
The steel box girder bridge is composed of five core welded components: top orthotropic deck plate, vertical web plates, bottom tension flange plate, longitudinal stiffeners (closed or open sections) welded on inner plate surfaces, and transverse intermediate diaphragms spaced along the bridge longitudinal direction. Primary plate thickness typically ranges from 12mm to 30mm for top plates, webs, and bottom plates, with secondary plate thickness of 10mm to 20mm.
The closed hollow cross-section delivers exceptional torsional rigidity—a critical advantage for curved bridges and structures subjected to eccentric loading—far surpassing the performance of traditional I-girder systems. This inherent torsional stiffness also enhances lateral stability during both construction and service, reducing the need for extensive temporary bracing. The box girder’s high strength-to-weight ratio enables longer spans with fewer intermediate supports, offering significant economic advantages over the entire life cycle.
Prefabrication & Modular Construction
Our box girder bridges are shop-fabricated in modular segments, with section lengths typically ranging from 10m to 30m (customizable based on transportation and hoisting constraints). Factory fabrication ensures precision CNC cutting, automatic submerged arc welding (SAW), and stringent quality control under controlled conditions—eliminating the variability and quality risks associated with field welding. Over 90% of the structure is completed in the factory, and the modular units are shipped to site for rapid bolted or welded assembly. This approach cuts on-site construction time by up to 60% and significantly reduces on-site labor, traffic disruption, and project management costs. The modular product design improves versatility across different spans and lane configurations, greatly simplifying the construction process to meet industrial construction requirements. Available configurations include single-box (ideal for bridge widths up to 3 lanes), double-box (for 4–6 lanes or where single-box dimensions pose transportation/installation challenges), and multi-box systems (for short spans with wide decks).
Customization & Material Options
| Item | Specification |
|---|---|
| Span Range | Single spans: 6m to 50m (customizable); continuous spans up to 8 spans |
| Bridge Width | 2m to 24m (customizable) |
| Girder Height | 0.8m to 3.5m, customized based on loading conditions |
| Material Grades | ASTM A709 / A709M (Grades 36, 50, 50W, HPS 70W), ASTM A572 and equivalent carbon & low-alloy structural steels |
| Deck Systems | Orthotropic steel deck or composite concrete deck with shear connectors for full composite action |
| Surface Protection | Hot-dip galvanization (ASTM A123), epoxy paint systems; C3/C4 anti-corrosion coating available for coastal environments |
| Connection Methods | High-strength bolted assembly (AISC 303) or field welding complying with AWS D1.5M |
Quality Assurance & Certification
Our commitment to quality is embedded in every stage of production:
- Design Verification: Full structural analysis and load rating per AASHTO LRFD specifications, including constructibility, service, fatigue and fracture, flexure, and shear verifications
- Material Traceability: Complete mill test reports (MTRs) and material certifications for all structural steel
- Welding Quality Control: 100% ultrasonic testing (UT) on fracture-critical member welds; magnetic particle (MT) and dye penetrant (PT) testing as applicable
- Fabrication Tolerances: Strict adherence to AASHTO/AWS dimensional tolerances for fit-up and camber
- Third-Party Inspection: Optional independent inspection by SGS, BV, or client-nominated agencies
- Certifications: EN1090, ISO 9001, CE, and project-specific certifications available upon request
Conclusion: Engineered for Excellence, Built for the Long Haul
The Custom Prefabricated Box Girder Steel Bridge is more than a structural system—it is a complete engineering solution that combines the rigor of AASHTO LRFD design with the precision of AWS D1.5M-certified fabrication. From superior torsional rigidity and modular shop prefabrication to customizable span and loading configurations, every aspect of this bridge is engineered to deliver exceptional durability, accelerated project delivery, and long-term cost efficiency.
Whether your project demands a highway overpass, a railway crossing, a pedestrian bridge, or a heavy-load industrial access structure, we provide end-to-end engineering support—from conceptual design and detailed shop drawings to fabrication, delivery, and on-site technical supervision. Contact us today to discuss your specific project requirements and discover how our AASHTO & AWS-certified box girder bridge systems can bring your infrastructure vision to life—on time, on budget, and built to last.
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