ICF(Insulated Concrete Form) Bracing
Elegant Long-Span Steel Through-Truss Bridge per AASHTO LRFD Seismic
A steel truss bridge is a type of bridge that uses steel trusses as the main load-bearing structure. The steel members are connected through welding, bolts, or rivets to form a triangular unit stress system. It is a prefabricated steel structure bridge with long spans, heavy loads, and high reliability, and is widely used in transportation, municipal engineering, industrial and mining projects, and emergency rescue situations.
1.Application Scenarios
Application Scenario |
Description |
Road & Municipal Transportation |
Suitable for urban overpasses, provincial & county roads crossing rivers, and mountain highways spanning valleys. It can support normal and heavy-duty traffic with stable structure and safe passage. |
Railway & Industrial Heavy-duty |
Used for railway bridges, factory transport corridors, and mining heavy-duty bridges. It withstands long-term, frequent heavy loads with excellent vibration and fatigue resistance. |
Pedestrian & Landscape Paths |
Applied to pedestrian and landscape bridges in parks, riverfront areas, and industrial parks. It features a light and transparent appearance, quick construction, and both practicality and aesthetics. |
2.Product Highlights
ü Transparent and Lightweight Visual Effect:The truss members form a geometric rhythm, with minimal obstruction to the view under the bridge, suitable for areas with high landscape requirements.
ü Clear Member Force Distribution:Two-force member system, primarily axial force, with minimal bending moments and shear forces, material utilization efficiency close to the theoretical optimum.
ü Factory-prefabricated Joints:Node plates and member ends are cut and drilled in the workshop, ensuring high on-site assembly rates, and welds and bolt hole quality are controllable.
ü Easy Disassembly and Relocation:Fully bolted trusses can be completely dismantled and rebuilt elsewhere, making them particularly suitable for temporary bridges and rental asset operations.
ü Good Wind Load Permeability:Hollow structures allow wind loads to pass freely, reducing lateral wind load by 50%~70% compared to solid beams.
ü Adaptable to Complex Alignments:By adjusting the span length and truss height, it can accommodate both horizontal curves and vertical slopes without additional construction.
3.Product Materials
l Chord Members (Upper and Lower Chords):European Standard S355J2 N / American Standard ASTM A572 Gr.50 / Australian Standard AS/NZS 3678 Grade 400, with good low-temperature toughness and welding performance.
l Web Members and Node Plates:Material matches the chord members (equal or slightly lower grade); thick plates must meet Z-direction performance and impact toughness requirements.
l High-Strength Bolts:European Standard ISO 10.9 / American Standard ASTM A325 / Australian Standard AS 1252 Grade 8.8, calibrated with torque coefficients and friction surface tests.
l Pins (if applicable):Alloy steel tempered (European Standard 42CrMo4 / American Standard AISI 4140), surface hardness ≥320 HB, ultrasound testing required.
l Welding Materials:Low-hydrogen electrodes/wires (e.g., AWS E7015), strength matched to base metal, impact toughness meeting -20°C requirements.
l Corrosion Protection System:Hot-dip galvanizing (ISO 1461 / ASTM A123 / AS 4680) or epoxy zinc-rich polyurethane topcoat system (total film thickness ≥280μm), optional metal spraying with sealer coating.
4.Design Features
Ø Truss Form Selection
² Warren: Web members form a W shape, no verticals, fewer members, clear sight lines.
² Pratt: Vertical members under compression, diagonal members under tension, excellent fatigue performance.
² Howe: Vertical members under tension, diagonal members under compression, suitable for wood composite structures.
² Double-intersected: Based on Warren with additional reverse diagonals, high node density, suitable for heavy loads.
Ø Support Mode
² Through truss: Deck located at the bottom chord, trusses form railings on both sides, minimal vehicle clearance restriction.
² Deck truss: Deck located at the top chord, trusses hidden beneath deck, suitable for a wide deck.
² Pony truss: No top lateral connections, deck located at the bottom chord, used when height is limited.
Ø Node Construction
² Welded node with integral node plate: Factory-welded, site-bolted, high precision, suitable for permanent bridges.
² Fully bolted node: No welding at all, suitable for removable and temporary bridges.
² Pinned node: High rotational freedom, suitable for military and emergency bridges (e.g., Bailey bridges).
² Stability Control: Lateral bracing on the top chord controls out-of-plane buckling; transverse braces and upper longitudinal connections placed between panels.
² Fatigue Key Details: Node plate to chord fillet weld ends, around bolt holes, bearing surfaces of pin holes.
5.Core Advantages
⭐Material Utilization Reaches Theoretical Maximum:Members are mainly subjected to axial forces, with uniform stress distribution, saving 20%~35% of steel compared to steel box beams or steel plate beams for the same span and load.
⭐Extremely Lightweight, Low Foundation Cost:Hollow structure and discrete member arrangement significantly reduce the structure's self-weight, thereby lowering the cost of substructures and foundation treatment.
⭐Minimal Construction Interference with Traffic:Whole-span assembly hoisting or cantilever assembly techniques can be used, completely avoiding supports beneath and traffic rerouting when spanning existing roads or railways.
⭐Unmatched Visual Transparency:No solid panels underneath the bridge, allowing continuity of water scenery, greenways, and urban landscapes, making it the preferred structure for scenic bridges.
⭐Flexible Full-Life-Cycle Assets:Fully bolted trusses can be dismantled, transported, and reused multiple times; even welded trusses can have members and node plates recycled as scrap steel, with high residual value.
⭐Outstanding Economic Efficiency for Long Spans:Economic span range is 40~200 meters, within which the unit area cost is lower than other steel bridge types, with greater advantages as the span increases.
⭐Superior Wind Resistance and Stability:Hollow structure significantly reduces wind load, with higher critical wind speed for lateral stability compared to solid beam bridges, eliminating the need for additional wind fairings or aerodynamic measures.
6.Global Standard
Standard Code |
Full Standard Name |
Main Application |
GB 50017 |
Steel Structure Design Code |
China municipal & highway steel bridges |
AISC 360 |
Structural Steel Specification |
North America truss bridge engineering |
Eurocode 3 (EN 1993) |
European Steel Structure Standard |
EU civil & traffic bridge projects |
BS 5950 |
Structural Steel Design Standard |
UK and regional infrastructure |
ASTM A36 |
Carbon Structural Steel Standard |
Global bridge raw material application |
7.Why choose us
Choosing our steel truss bridges means you are choosing a solution that takes rational mechanics and engineering economy to the extreme. We don’t just deliver welded or bolted members—we deliver finely optimized node structures, traceable hole-making precision, and assembly segment divisions that perfectly match the on-site lifting plan.
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