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 bridgethat utilizes a framework of steel trusses to support the bridge deck. Trussesare structural elements consisting of interconnected bars or beams arranged ina triangular pattern, which provides excellent strength and stiffness. Steeltruss 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 intoupper bearing steel truss bridge that the bridge floor is located in the upperpart of the main truss and lower bearing steel truss bridge which the bridgefloor is located in the lower part of the main truss.

(1) Main girder

It is the main load-bearing structure andbears vertical loads.

The main truss is composed of upper chord, lower chord and bellyrod. 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 horizontalconnection.
2. Function: Connect the main truss, make the bridge span structure become astable space structure that can withstand a variety of lateral loads.
3. The longitudinal connection system is divided into upper horizontallongitudinal connection system and lower horizontal longitudinal connectionsystem. The main function is to withstand the transverse horizontal load,transverse wind, lateral rocking force and centrifugal force acting on thebridge span structure. In addition, the transverse support chord, reducing itsfree length outside the plane.
4. The transverse connection is divided into bridge frame and crosslink. Themain function is to increase the torsional stiffness of steel girder. Properlyadjust 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 thelongitudinal beam.
2. Way of force transmission: the load first acts on the longitudinal beam, andthen from the longitudinal beam to the beam, and then from the beam to the maintruss.

(4) Bridge deck

The bridge deck is the part for vehicles and pedestrians to walk on. Theform of the deck is similar to that of steel beam Bridges and combined beambridges.
Geometric characteristics of the main truss:
Economy, simple structure, conducive to standardization and easy to manufactureand install.

The main truss categories:

Triangular truss: Triangular truss structure is simple, the design isfixed, 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 twodiagonal rods, which are small and short in section.
The bar has many specifications, many nodes, short intersections, and manycrossbar beams and connections. For small and medium-sized spans, the structureis complex.
For large spans, the rods are short, light and suitable for mounting anddismounting Bridges.

Double-vented bar truss:

The same internode shear force is borne by twodiagonal rods, which are small and short in section.
It is used for large span, short compression inclined rod, which is favorablefor buckling stability.
The small section of the inclined rod makes the number of connecting pins onthe 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 thecenter of the span. The vertical members are in tension, and the diagonalmembers are in compression. This design is efficient for medium - to - long -span bridges. It is often used for railway bridges and highway bridges, as itcan effectively carry heavy loads over a considerable distance.
2. Howe Truss Bridge
In a Howe truss, the diagonal members slope in the opposite direction comparedto the Pratt truss (away from the center of the span). The Howe truss uses woodor 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 trussbridge:

Highway and Road Bridges: Steel trussbridges 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, makingthem versatile for accommodating different road widths and crossing variousterrains.

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 configurationssuch as Pratt trusses, Howe trusses, or Warren trusses can be chosen dependingon the span length, expected loads, and available construction resources.

2. Durability and Long - TermPerformance
With proper maintenance, including regular painting to prevent corrosion andinspection of the steel members for signs of fatigue or damage, steel trussbridges can have a long service life. The durability of steel, combined withits ability to resist environmental factors such as wind, rain, and temperaturechanges, makes it a reliable choice for long - term infrastructure.

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