Product Name
Bridge I-Beam (Bridge I-Section / Bridge Girders)
Introduction
Bridge I-Beams are primary load-carrying steel members engineered specifically for bridge structures - ranging from short-span rolled I-sections to large plate-girders and welded I-type superstructures. Designed for high bending moments, shear, fatigue and dynamic wheel/traffic loads, Bridge I-Beams are supplied as rolled profiles where available and economical, or as fabricated (welded) plate girders, tapered girders and cellular/castellated beams when greater capacity, service openings or long spans are required.
Typical Types
Rolled I / Wide-flange (W / IPE / HEA / HEB) - economical for short to medium spans.
Welded/Plate I-girders - flange + web plates welded to create deep girders for medium-to-long spans.
Tapered plate girders - web or flange tapering to optimize material use along span.
Cellular / Castellated beams - lighter weight with integrated openings for services and reduced self-weight.
Composite steel-concrete I-beams - steel girder acting as permanent formwork and composite action with deck slab.
Typical Materials & Grades
Structural carbon & low-alloy steels: S355 / S420 / S460 (EN), A572 Gr.50 / A709 (ASTM/AASHTO) for bridge use.
Marine/offshore or heavy-duty: AH36 / DH36 / EH36 or specified HSLA grades.
Optional corrosion-resistant alloys or duplex stainless steels for extreme environments.
Typical Dimensions & Ranges
Depth (h): 300 mm → 3,000+ mm (project dependent; plate girders commonly 800–2,500 mm).
Flange widths (b): 150 mm → 1,200 mm.
Web thickness (tw): 8 mm → 60+ mm.
Flange thickness (tf): 10 mm → 150 mm.
Mass per metre: ~50 kg/m (small rolled) to several hundred kg/m (large plate girders).
Standard/available lengths: factory lengths up to equipment limit (6–18 m typical); long spans delivered as spliced segments.
Design & Performance Features
High moment & shear capacity: flanges sized for bending, web for shear-stiffeners added where required.
Fatigue-resistant detailing: welded joint geometry, fillet controls and post-weld treatments to meet bridge fatigue classes.
Camber & pre-camber: factory camber provided to compensate predicted deflections under service loads.
Service openings & access: cellular/castellated patterns or web openings for utilities and drainage with local reinforcement.
Composite action capability: shear studs and deck interface prepared for composite concrete slabs to increase stiffness and reduce steel tonnage.
Corrosion protection: hot-dip galvanizing, zinc thermal spray, epoxy/alkyd primer + topcoat or duplex systems for harsh exposures.
Standards & Codes (typical references)
Eurocode: EN 1993 (Eurocode 3) and national annexes.
AASHTO / ASTM: AASHTO LRFD Bridge Design Specifications and ASTM/AASHTO material standards (e.g., A709).
Welding & QA: EN ISO 3834, AWS D1.1 / EN ISO 5817 welding criteria, project specifications.
(Use project / country standard as contract reference.)
Fabrication & Value-Added Options
Plate cutting & profiling: CNC plasma/laser for precise splice & web openings.
Welding: SAW / MIG / MAG robotic lines for consistent seams; WPS/PQR controlled procedures.
Pre-assembly: splice packs, match-drilled holes and unitized sections for rapid site erection.
Cambering & straightening: factory cambering to offset service deflection.
Shear studs / shear connectors: welded and tested for composite decks.
Pre-installed accessories: lifting lugs, access brackets, crane pads and temporary erection brackets.
Quality Assurance & Testing
Material certification: Mill Test Certificates (MTC) and traceability.
Mechanical tests: tensile, yield, and Charpy impact testing (as required for low-temperature service).
NDT: UT/RT for critical welds, MT/PT for surface defects; sample or 100% as specified.
Fatigue & weld inspection: joint measurement, weld profile control and post-weld heat treatment where required.
Dimensional control: laser scanning for camber, straightness and geometry verification prior to shipping.
Packaging, Transport & Erection Support
Packing: cradles, skids and protective packing to protect coatings and maintain camber.
Marking: part ID, orientation, splice number and erection sequence markings.
Transport: delivery planning for oversized/overweight shipments; spliced segments for long spans.
Site services: lifting plans, match-drill kits, on-site alignment support and erection supervision available.
Typical Applications
Highway & railway bridge main girders and approach spans.
Pedestrian, vehicular and light-rail bridge superstructures.
Viaducts, overpasses and culvert bridges.
Bridge strengthening & rehabilitation (stitching new I-beams onto existing structures).
Marine approach spans and small ferry ramps (with appropriate grade/coating).
How to Order / Technical Info Required
To prepare a quotation and fabrication plan, please provide:
Bridge span(s), support conditions and number of lanes/traffic loading.
Dead & live loads, wheel/axle loads, dynamic/fatigue criteria and design code.
Desired material grade and environmental exposure (corrosive/marine/industrial).
Maximum single-piece transport/cranage limits or preference for spliced sections.
Required finishes/coatings and any testing/certification requirements.
Drawings or preliminary layout (girder spacing, deck type, slit/pier interfaces).
We will return recommended girder type (rolled vs plate girder), section properties (Ix, Sx, area, weight/m), fabrication drawings, QA plan and a competitive quotation.
Why Choose Our Bridge I-Beams?
We deliver engineered bridge girders combining structural optimization, fatigue-aware detailing, robust fabrication and end-to-end QA-minimizing life-cycle cost while meeting code performance and erection logistics. Provide your bridge parameters and we'll size options (rolled vs plate, composite vs non-composite), produce weight/section tables and a detailed proposal.
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