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High Stiffness Simply Supported Steel Truss Bridge With Upper Bearing China Factory

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Steel Truss Bridge Description:

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Introduction of the steel truss bridge:

The steel truss bridge is a type of bridge that utilizes a framework of steel trusses to support the bridge deck. Trusses are structural elements consisting of interconnected bars or beams arranged in a triangular pattern, which provides excellent strength and stiffness. Steel truss bridges are popular due to their strength, durability, and versatility.

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

(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.

Diagonal bar truss:

Many bar specifications.
Many specifications and large internal force of the vertical rod.
All are large nodes.

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.

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.

Common types of steel truss bridges:

1. Pratt Truss Bridge
The Pratt truss is characterized by its diagonal members that slope towards the center of the span. The vertical members are in tension, and the diagonal members are in compression. This design is efficient for medium - to - long - span bridges. It is often used for railway bridges and highway bridges, as it can effectively carry heavy loads over a considerable distance.
2. Howe Truss Bridge
In a Howe truss, the diagonal members slope in the opposite direction compared to the Pratt truss (away from the center of the span). The Howe truss uses wood or metal vertical members in compression and diagonal members (usually metal) in tension. Historically, it was a popular design for railway bridges, especially in the 19th century.

Application of the steel truss bridge:

Highway and Road Bridges: Steel truss bridges are frequently used in the construction of highway and road bridges. They are suitable for a wide range of span lengths, from short to long, making them versatile for accommodating different road widths and crossing various terrains.

Pedestrian Bridges

Advantages of the steel truss bridge:

1. Adaptability and Flexibility in Design
The truss design provides great flexibility. Engineers can vary the geometry, size, and arrangement of the trusses to meet specific site requirements, load - bearing needs, and aesthetic considerations. Different truss configurations such as Pratt trusses, Howe trusses, or Warren trusses can be chosen depending on the span length, expected loads, and available construction resources.

2. Durability and Long - Term Performance
With proper maintenance, including regular painting to prevent corrosion and inspection of the steel members for signs of fatigue or damage, steel truss bridges can have a long service life. The durability of steel, combined with its ability to resist environmental factors such as wind, rain, and temperature changes, makes it a reliable choice for long - term infrastructure.