High-Strength ASTM A588 Steel Plate Truss Bridge – Weathering Steel Girder for Long Span Highway Crossings

The High-Strength ASTM A588 Steel Plate Truss Bridge is a prefabricated girder bridge engineered for long-span highway crossings under heavy traffic load. Chords, web plates, and gussets are cut and welded from ASTM A588 high-strength low-alloy weathering steel, combining a 345 MPa minimum yield strength with atmospheric corrosion resistance several times higher than ordinary carbon steel.

The bridge is shop-fabricated in match-marked segments, trial-assembled before delivery, and erected on-site with high-strength friction-grip bolts. The bolted segment system removes the need for large site welding crews, shortening erection time to a few days, and keeping traffic disruption to a minimum. The open truss layout distributes wheel loads along the full chord length, allowing a longer clear span with a shallower, lighter superstructure—reducing pier count, foundation work, and whole-life cost.

Key Features

• Premium Material: ASTM A588 Gr.A/B weathering plate with 345 MPa min yield, 485 MPa min tensile, and 18% min elongation.

• Custom Configurations: Warren, Pratt, or Howe plate truss configurations selected by span, load class, and deck width.

• Maintenance-Free: Self-protecting oxide patina on exposed surfaces eliminates periodic repainting.

• Heavy Load Capacity: Designed to AASHTO HS20-44 / HS25-44 or client-specified live load classes.

• Fast Erection: Match-marked bolted segments (trial assembled in shop) enable rapid site erection without large falsework.

• Certified Welding: Full penetration welding to AWS D1.5 with ultrasonic (UT) and magnetic particle (MT) inspection.

• Severe Environment Ready: Galvanized or inorganic zinc duplex system available for coastal and high-humidity sites.

• Complete Package: Includes erection drawings, bolt sets, bearings, mill certificates, and load test reports.

Technical Specifications

Why ASTM A588 Weathering Steel?

In normal atmospheric exposure, A588 steel develops a dense, tightly adherent oxide layer that acts as its own protective coating.

• Unmatched Durability: Corrosion loss is reduced to roughly one quarter that of ordinary carbon steel.

• Zero Recoating: Unlike a paint system, the patina does not peel or need recoating.

• Cost Saving: For a highway bridge in a remote location, busy corridor, or coastal environment with limited maintenance access, this sharply cuts whole-life costs and avoids repainting shutdowns.

Applications

• Highway and expressway crossings

• Rural and county road bridges

• River and canal crossings

• Industrial and mining access bridges

• Port and logistics park haul roads

• Temporary and emergency detour bridges

• Pedestrian and light vehicle overpasses

About Our Company

Hangzhou FAMOUS Steel Engineering Co., Ltd. was established in 2002. We are an integrated structural steel manufacturer and global exporter, providing one-stop services from design and fabrication to surface treatment and export delivery.

Certified to ISO 9001 and CE (EN 1090), we operate complete in-house lines for Corten steel plate cutting, jig assembly, welding, and trial pre-assembly. We supply high-quality steel bridges, steel buildings, and custom fabricated structures to industrial, municipal, and mining projects worldwide.

🌐 Websites: www.famoussteel.com | www.steelfabricat.com | www.structural-steelbuilding.com

📩 Get Your Custom Bridge Solution

Send us your span, bridge width, design load, deck type, and site environment. We will return a preliminary truss layout, material proposal, and competitive price for your review, then issue shop drawings for approval before fabrication starts.

Contact us today to start your next highway bridge project.