Heavy-Load Prefabricated Steel Arch Bridge Aashto Lrfd for Multi-Lane Road

• Customization: Available
• After-sales Service: 24/7 Online Technical Support
• Warranty: 1 Year
• Model NO.: Steel Arched Bridge
• Welding Standard: Aws D1.5m/D1.5 Bridge Welding Code (2025 ED.)
• Main Steel Material: ASTM A709 Grade 50 / Q355b Carbon Structural Steel
• Welding Inspection: 100% Ut for Primary Load-Carrying Welds
• Arch Section Type: Closed Box Arch Rib with Internal Stiffeners
• Fabrication Type: Full Prefab, CNC + Auto Weld
• Load Standard: Aashto Hl-93 + Fatigue
• Anti-Corrosion: HDG / Weathering Steel / Epoxy Paint
• Applications: Multi-Lane Highway, Urban Interchange
• Transport Package: Seaworthy Packing
• Specification: High strength structural steel
• Trademark: FAMOUS
• Origin: China
• HS Code: 730890000
• Package Size: 1000.00cm * 200.00cm * 100.00cm
• Package Gross Weight: 50000.000kg
• Lead Time: 60 days (1 - 20 Tons) ; To be negotiated ( > 20 Tons)

Product Description

This Heavy-Load Prefabricated Steel Arch Bridge is designed and manufactured in full compliance with AASHTO LRFD Bridge Design Specifications (10th Edition, 2024) and the AWS D1.5M/D1.5 Bridge Welding Code (2025 Edition) . Specifically engineered for multi-lane highway infrastructure projects across North America and global markets adopting American design standards, this bridge utilizes arch ribs as the main load-bearing structure, transferring loads to abutments through compression and making full use of steel's compressive strength. All arch rib box girders are fully prefabricated in our ISO-certified facility with complete one-side preassembly prior to shipment, ensuring on-site installation accuracy. The closed-box arch section provides superior torsional rigidity and heavy-load bearing capacity, making it ideal for multi-lane highways, urban arterials, and interchange overpasses.

Specification

Parameter Category	Detailed Technical Data
Structural Configuration	Steel box arch ribs with lateral wind braces; orthotropic steel deck system comprising top deck plate, vertical web plates, bottom tension flange, longitudinal stiffeners, and transverse diaphragms. Arch ribs function as primary load-bearing structure transferring loads through compression.
Span & Dimensional Range	Usable span: 30m – 200m with adjustable arch rise ratio 1:4~1:7; Bridge width: 6m – 24m customizable for multi-lane layouts; Single section length: 2m – 12m per prefabricated segment.
Steel Material Specifications	ASTM A709 Grade 50 / Q355B carbon structural steel; Minimum plate thickness 1/4 inch (6mm) for primary members; Plate thickness range 8mm – 50mm, graded per load calculation.
Welding & Fabrication Standards	100% UT (ultrasonic testing) for all primary load-carrying welds; Full penetration groove welds for primary splices and fillet welded stiffener systems; AWS D1.5 Clause 12 governs fracture-critical member fabrication; Fabrication executes CNC cutting, automatic welding, and precision drilling.
Load & Performance Standards	AASHTO LRFD limit states: Strength I, II, III, V; Fatigue I; Extreme Event I & II; Service I; Design load: AASHTO HL-93 standard vehicle load, up to 600kN heavy load; Fatigue life: ≥2 million cycles; Seismic performance adaptable to AASHTO seismic categories I-IV.
Anti-Corrosion & Coating	C3/C4 coastal anti-rust standard for seaside environments; Custom multi-layer epoxy/polyurethane paint per client specification; Hot-dip galvanizing (ASTM A123) available; Weathering steel (Corten) option for uncoated, low-maintenance applications.

Standard Compliance & Quality Assurance

All manufacturing processes strictly follow AASHTO LRFD load-resistance factor design rules and AWS D1.5 welding requirements. The AWS D1.5 code is specially customized for carbon and low-alloy structural bridge steels, distinguished from general structural welding specification AWS D1.1 by stricter fatigue resistance, fracture control, and nondestructive testing rules targeting bridge cyclic vehicle loads and long-term environmental erosion. Our factory holds official AWS D1.1 certification and all welders are individually qualified under AWS D1.5. Every coil of steel plate is supplied with ASTM A709 material test certificates and is subject to third-party inspection upon request. We provide full traceability from raw material to finished segment, ensuring smooth acceptance by US highway authorities and eliminating compliance risks for contractors.

Factory Fabrication & Preassembly Workflow

All arch components – plates, stiffeners, diaphragms, and connection plates – are cut, bent, welded, and drilled inside our enclosed heavy-fabrication workshop using CNC plasma cutters (cutting accuracy: ±0.5mm), robotic welding lines, and large boring machines. 90% factory prefabrication eliminates complex on-site welding and significantly reduces construction time. After individual fabrication, we carry out a complete one-side preassembly of the entire arch rib on dedicated steel jigs. During preassembly, we verify arch linearity, bolt hole concentricity (hole position accuracy: ±0.3mm), segment matching gaps, overall span, and camber. Component assembly error is controlled within ≤2mm per AASHTO fabrication tolerances. Inspection records are signed off and shipped with delivery documents for client site reference.

Structural Performance Highlights

1.Closed-box arch section greatly improves bending and torsional stiffness (torsional rigidity: ≥1.2×10¹¹ N·mm²), effectively reducing deflection under heavy truck loads.
2.Lightweight steel structure reduces foundation costs and shortens erection cycles compared with concrete arches.
3.Fatigue-resistant details per AWS D1.5 Clause 12 ensure long-term durability under cyclic highway traffic.
4.Modular split-segment design enables economical sea container transport and rapid bolted field splicing.
5.Inward-inclined basket arch configuration reduces out-of-plane support requirements, improving self-stability by over 50%.
6.Weathering steel option eliminates painting requirements in suitable environments, lowering life-cycle maintenance.

Application Scenarios

1.Multi-lane highways and interstate arterial roads crossing rivers, railways, or deep valleys.
2.Urban interchange overpasses and ring road landmark signature bridges.
3.Heavy-duty industrial park access roads with frequent truck traffic.
4.Coastal city bridges requiring salt-fog resistance with specialized anti-corrosion systems.
5.Long-span crossings (30–200 meters) where minimizing intermediate piers is structurally or aesthetically preferred.

Packing & Delivery

All split arch segments are packed for seaworthy ocean transport: steel surfaces receive shop primer and protective coating, edges are reinforced with collision-proof steel frames, and each bundle is secured with steel strapping. We offer container loading (20GP/40GP) or break-bulk vessel shipment according to segment dimensions. A professional loading layout drawing is provided to maximize container utilization and prevent deformation during long transits. Complete packing lists, bills of lading, and customs-clearance documents are supplied. HS Code: 730890000.

After Sales Service

We are committed to providing comprehensive after-sales support to ensure smooth project execution and long-term bridge performance. Our service package includes:
1.Installation Supervision – We dispatch experienced steel structure supervisors to your construction site for on-site technical guidance, covering foundation setting, segment alignment, bolting torque control, and final erection inspection. Supervisors stay until the bridge is safely installed and accepted.
2.Product Warranty – Standard 1-year warranty against fabrication defects, material non-conformities, and weld quality issues. Extended warranty options (up to 5 years) are available upon request for critical components.
3.Technical Support – 24/7 remote engineering assistance via email, phone, or video conference. Our structural engineers respond within 24 hours to any technical queries, including load calculation verification, erection sequence optimization, and field adjustment solutions.
4.Spare Parts Supply – We stock and supply critical spare parts such as high-strength bolts (ASTM A325), expansion bearings, deck drain covers, and corrosion-touch-up coating kits. Emergency parts can be air-shipped within 72 hours to minimize downtime.
5.Training Program – We offer on-site training sessions for your local erection crew, covering proper bolting procedures, welding repair techniques (if needed), and daily maintenance checklists. Training materials and operation manuals are provided in English.
6.Maintenance Guidance – We provide a customized periodic inspection and maintenance schedule based on your specific environment (e.g., coastal, high-traffic, or freeze-thaw zones). This includes recommended coating touch-up intervals, bolt re-torquing cycles, and deck waterproofing inspection, helping you achieve the 75–100-year design service life with minimal life-cycle cost.

Company Profile

Hangzhou FAMOUS Steel Engineering Co., Ltd. is a professional heavy steel structure manufacturer with over 20 years of fabrication experience, located in Hangzhou, Zhejiang, China. Our workshop is equipped with advanced CNC cutting, bending, automatic welding, and NDT inspection systems. We hold ISO 9001, EN1090, ISO3834, and AWS D1.1 certifications and have successfully exported numerous AASHTO-standard steel bridges to North America, Australia, and the Middle East. We provide a one-stop service – from structural design and detailing, full fabrication, preassembly, to export packaging and shipping – ensuring reliable quality and timely delivery for global highway contractors.