Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry

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Steel Truss Bridge Description:

Introduction of the steel truss bridge:

The steel truss bridge is a structural system between beams and arches. It is a structure in which a bent upper beam structure and a pressure-bearing lower column are integrated together. Due to the rigid connection between the beam and the column, the beam is unloaded due to the flexural rigidity of the column. The entire system is a compression-bending structure as well as a thrust structure.

According to the different position of the bridge floor, it is divided into upper bearing steel truss bridge that the bridge floor is located in the upper part of the main truss and lower bearing steel truss bridge which the bridge floor is located in the lower part of the main truss.

The structure composition of rigid truss beam bridge: Main girder, Bracing, Bridge deck system, Bridge floor

                     Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

Truss bridges can be constructed using a variety of materials, including wood, iron, steel, or concrete. Steel truss bridges are particularly common due to their durability and strength-to-weight ratio. The truss elements are typically connected by rivets, bolts, or welds, depending on the construction material and design.

(1) Main girder

It is the main load-bearing structure and bears vertical loads.

The main truss is composed of upper chord, lower chord and belly rod. The belly bar is divided into diagonal bar and vertical bar.

Nodes are divided into large nodes and small nodes.

Pitch refers to the distance between nodes.

(2) Bracing

1. Classification: longitudinal connection and horizontal connection.

2. Function: Connect the main truss, make the bridge span structure become a stable space structure that can withstand a variety of lateral loads.

3. The longitudinal connection system is divided into upper horizontal longitudinal connection system and lower horizontal longitudinal connection system. The main function is to withstand the transverse horizontal load, transverse wind, lateral rocking force and centrifugal force acting on the bridge span structure. In addition, the transverse support chord, reducing its free length outside the plane.

4. The transverse connection is divided into bridge frame and crosslink. The main function is to increase the torsional stiffness of steel girder. Properly adjust the uneven force of the two main stringer or two longitudinal links.

(3) Bridge deck system

1. Composition: the longitudinal beam, beam and the connection between the longitudinal beam.

2. Way of force transmission: the load first acts on the longitudinal beam, and then from the longitudinal beam to the beam, and then from the beam to the main truss.

(4) Bridge deck

The bridge deck is the part for vehicles and pedestrians to walk on. The form of the deck is similar to that of steel beam Bridges and combined beam bridges.

Geometric characteristics of the main truss:

Economy, simple structure, conducive to standardization and easy to manufacture and install.

The main truss categories:

Triangular truss: Triangular truss structure is simple, the design is fixed, easy to install and manufacture.

Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

Diagonal bar truss:

Many bar specifications. 

Many specifications and large internal force of the vertical rod.

All are large nodes.

Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

The K-shaped truss:

The shear force of the same node is borne by two diagonal rods, which are small and short in section.

The bar has many specifications, many nodes, short intersections, and many crossbar beams and connections. For small and medium-sized spans, the structure is complex.

For large spans, the rods are short, light and suitable for mounting and dismounting Bridges.

Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

Double-vented bar truss:

The same internode shear force is borne by two diagonal rods, which are small and short in section.

It is used for large span, short compression inclined rod, which is favorable for buckling stability.

The small section of the inclined rod makes the number of connecting pins on the joint plate less, and it is easy to arrange the joint.

Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

Overall, truss bridges are widely used due to their strength, efficiency, and versatility. They have been utilized in countless bridge constructions around the world and continue to be a popular choice for spanning long distances.

Advantages of the steel truss bridge:

Large span
Fast construction speed
Energy saving
Beautiful building appearance
Good seismic performance
Wide application
Can be customized

Application of the steel truss bridge:

Generally used for urban bridges or highway viaducts and overpasses with small spans, medium and small span reinforced concret, long span prestressed reinforced concrete, medium and small span straight-leg rigid frames (gate-style) and inclined leg rigid frames, large Span T-shaped rigid frame, continuous rigid frame.

Structural efficiency: Truss bridges are known for their structural efficiency. The triangular truss framework distributes loads effectively, allowing the bridge to support heavy loads while using a minimal amount of material. This efficiency results in cost savings during construction and reduces the weight of the bridge, which can be particularly beneficial in situations where the foundation or supporting structure has limited capacity.

Versatility: Truss bridges are versatile and can be designed to span both short and long distances. They can be adapted to various site conditions, including different spans, heights, and load requirements. Truss bridges also allow for flexibility in accommodating different types of traffic, such as roads, railways, or pedestrians, by adjusting the width and deck configuration.

Evercross Steel Bridges Overview:

Bailey bridge (Compact-200, Compact-100, LSB, PB100, China-321, BSB)
Modular bridge (GWD, Delta, 450-type, etc ),
Truss Bridge, Warren bridge,
Arch bridge, Plate bridge, Beam bridge, Box girder bridge,
Suspension bridge, Cable-stayed bridge,
Floating bridge, etc.
DESIGN SPANS10M TO 300M Single span
BS5400 HA+20HB, HA+30HB,
AS5100 Truck-T44,
IRC 70R Class A/B,
Truck-60T, Trailer-80/100Ton, etc.
STEEL GRADEEN10025 S355JR S355J0/EN10219 S460J0/EN10113 S460N/BS4360 Grade 55C
AS/NZS3678/3679/1163/Grade 350,
ASTM A572/A572M GR50/GR65
GB1591 GB355B/C/D/460C, etc.
AS/NZS 1554 or equivalent
BOLTSISO898, AS/NZS1252, BS3692 or equivalent
AS/NZS 4680
or equivalent

Permanent Steel Girder Railway Bridge Custom Single Lane For Ferry  steel truss bridge

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