Aashto Lrfd 20 Aws D1.5 Prefab Steel Arch Highway Bridge

Product Description

This prefabricated steel arch highway bridge is designed and manufactured in full compliance with AASHTO LRFD 20 (10th Edition) and the AWS D1.5 Bridge Welding Code (2025). It is specially engineered for North American highway infrastructure projects, meeting all federal and state DOT requirements. All arch rib box girders are fully fabricated in our ISO-certified Hangzhou plant, with complete one-side preassembly and inspection prior to shipment, ensuring on-site installation accuracy and zero rework. The closed-box arch section provides outstanding torsional rigidity and heavy-load bearing capacity, making it ideal for multi-lane highways, river crossings, and urban interchange viaducts.

Specification

Parameter Category	Specification Detail
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.
Steel Grade Options	ASTM A709 Grade 50 / Q355B carbon structural steel; minimum plate thickness 1/4 inch (6mm) for primary members, thickening per load demand.
Welding Requirements	Full penetration groove welds for primary splices and fillet welded stiffener systems; AWS D1.5 Clause 12 governs fracture-critical member fabrication; NDT includes 100% UT (ultrasonic testing), plus MT/PT as specified.
Coating System	Custom multi-layer epoxy/polyurethane paint per client spec; C3/C4 coastal anti-rust standard for seaside environments; hot-dip galvanizing (ASTM A123) available as alternative.
Design Load Standards	AASHTO LRFD limit states: Strength I, II, III, V; Fatigue I; Extreme Event I & II; Service I; fully compliant with federal highway funding requirements.

Standard Compliance & Quality Assurance

All manufacturing processes strictly follow AASHTO LRFD load-resistance factor design rules and AWS D1.5 welding requirements. Our factory holds official AWS D1.1 certification and our 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, robotic welding lines, and large boring machines. 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, segment matching gaps, overall span, and camber. Inspection records are signed off and shipped with the delivery documents for client site reference.

Structural Performance Highlights

Closed-box arch section greatly improves bending and torsional stiffness, effectively reducing deflection under heavy truck loads.
Lightweight steel structure reduces foundation costs and shortens erection cycles compared with concrete arches.
Fatigue-resistant details per AWS D1.5 Clause 12 ensure long-term durability under cyclic highway traffic.
Modular split-segment design enables economical sea container transport and rapid bolted field splicing.
Weathering steel option eliminates the need for painting in suitable environments, lowering life-cycle maintenance.

Application Scenarios
Interstate highways and urban arterial roads crossing rivers, railways, or deep valleys.
Municipal interchange overpasses and landmark signature bridges.
Heavy-duty industrial park access roads with frequent truck traffic.
Coastal city bridges requiring salt-fog resistance with specialized anti-corrosion systems.
Long-span crossings where minimizing intermediate piers is structurally or aesthetically preferred.

Packing & Delivery

All split arch segments are packed for seaworthy ocean transport: steel surfaces receive a 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 utilisation and prevent deformation during long transits. Complete packing lists, bills of lading, and customs-clearance documents are supplied.

After Sales Service

We provide full lifecycle after-sales support for all AASHTO standard steel arch bridge products. Professional technical documents, installation guidelines and inspection reports are completely supplied before delivery. We offer remote technical consultation, installation guidance, bolt tightening instructions and structural acceptance support for overseas projects. Long-term spare parts supply, welding technical support and regular product usage follow-up are available. If any quality or technical problem occurs during project construction, our engineering team will provide efficient solutions within 24 hours. We guarantee stable after-sales service to ensure smooth completion and long-term safe operation of global highway bridge projects.

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, China. We are 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.