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AASHTO LRFD Compliant Weather‑Resistant Box Girder Steel Bridge with Heavy Galvanized Coating
| 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
| Design Standard | AASHTO LRFD (10th Edition); Optional AS/NZS 5100 / Eurocode 3 | Welding Standard | AWS D1.5M |
|---|---|---|---|
| Deck Type | Orthotropic Steel Deck / Concrete Composite Deck | Corrosion Protection | Hot-dip Galvanizing (ASTM A123), Epoxy Coating, Weathering Steel |
| Field Connection | ASTM A325/A490 High-strength Bolts / AWS D1.5M Field Welding | NDT Inspection | 100% UT For FCM Welds; MT/PT As Required |
| Customization | Customized To Project Requirements (span, Width, Load, Site Conditions) | Applications | Highway Viaducts, Railway Crossings, Pedestrian Bridges, Heavy Industrial Roads |
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| NDT Inspection |
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Product Description
This AASHTO LRFD-certified weather-resistant box girder steel bridge is high-grade heavy-duty transportation infrastructure. Fabricated from ASTM A709 Grade 50W weathering steel and covered with thick hot-dip galvanized coating, it is manufactured strictly under AASHTO LRFD 10th Edition criteria, capable of sustaining HL-93 highway loads with a 100-year design life. The box girder structure delivers superior torsional rigidity and uniform load distribution, perfectly suited for highway viaducts, railway crossings, pedestrian bridges and heavy industrial access roads.
AASHTO LRFD Compliance – Top-Tier Engineering Standard
Designed and fabricated in full accordance with AASHTO LRFD Bridge Design Specifications (10th Edition). Adopting the LRFD load-resistance factor design system, it follows Article 6.11 for box girder design and Article 6.5.1 covering fabrication, delivery and erection phases. Rigid standard compliance lowers design risks, speeds up project approval and ensures long-term structural stability for owners and engineers.
ASTM A709 Grade 50W Weathering Steel – Natural Anti-Rust Base Material
The bridge substrate is ASTM A709 Grade 50W weathering steel with a minimum yield strength of 345 MPa. It generates a compact stable rust barrier under atmospheric exposure automatically, trimming long-term maintenance costs by 70% compared with ordinary carbon steel in C3–C4 corrosive environments. Great fatigue resistance and fracture toughness guarantee permanent structural security.
Heavy Hot-Dip Galvanized Coating – Dual Anti-Corrosion Protection
All inner and outer steel surfaces undergo hot-dip galvanizing per ISO 1461 & ASTM A123, with coating thickness ≥85 microns (up to 100+ microns optional). The zinc layer offers sacrificial cathodic protection, adapting to coastal, humid and industrial corrosive regions. Combined with weathering steel base, this dual anti-corrosion system prolongs service time sharply and cuts lifecycle maintenance expenses.
Box Girder Structure – Outstanding Mechanical Performance
The closed box cross-section features exceptional torsional stiffness, applicable to curved, skewed and wide bridge decks. It evenly disperses vehicle loads, lowers structural depth and delivers tidy exterior appearance. Diaphragms, cross frames and lateral bracing are configured per AASHTO requirements; built-in drain holes avoid water buildup and internal corrosion.
Specification Table
| Specification Item | Details |
|---|---|
| Design Standard | AASHTO LRFD (10th Edition); optional AS/NZS 5100 / Eurocode 3 |
| Material Code | ASTM A709 Grade 50W Weathering Steel / AASHTO M270 |
| Yield Strength | 345 MPa minimum |
| Coating Norm | Hot-dip galvanized: ISO 1461 / ASTM A123 |
| Coating Thickness | ≥85 microns; customizable up to 100+ microns |
| Welding Standard | AWS D1.5 Bridge Welding Code |
| Design Live Load | AASHTO HL-93 / HS-25 |
| Design Life | 100 years |
| Machining Tolerance | CNC drilled holes: ±2mm |
| Quality Certification | ISO 9001:2015 Certified |
Precision Prefabrication & Modular Erection
All components are fully shop prefabricated under controlled workshop conditions. Equipped with CNC drilling and laser cutting equipment, hole tolerance is controlled within ±2mm, achieving 100% on-site assembly matching without field rework. Modular segments simplify ocean shipping and quick field installation; construction period is shortened by 50–60% versus cast-in-place concrete bridges.
Heavy Load Bearing & Wide Customization
Standard design carries HL-93 highway loads, single-lane capacity over 70 tons, fitting mine haulage, heavy machinery transport and highway traffic. Single span ranges from 10m to 90m without intermediate piers; cantilever launching and incremental launching are available for valleys and river crossings. Deck width customizable: 3.5m–12m (single/double lane), sidewalks and pipeline brackets are optional.
Summary
The AASHTO LRFD Compliant Weather‑Resistant Box Girder Steel Bridge with Heavy Galvanized Coating integrates premium international standards, high-performance steel and powerful anti-corrosion treatment, featuring safety, long service life and favorable overall cost. Supported by ISO 9001 quality management and AWS D1.5 welding specifications, alongside a 100-year design lifespan, it is the reliable infrastructure option for global transportation projects.
Reach out to us for tailored project solutions. Our engineering team provides full-cycle service covering design, production, shipment and field guidance to deliver your bridge project on schedule and within budget.
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