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Home Reference

Steel Bridge: Check Components, Types, and Structure

by Boby Chandro
October 29, 2024
in Reference
Reading Time: 4 mins read
| Bahasa Indonesia Indonesia
Steel Bridge

A steel bridge is built with an all-steel superstructure, including the deck, providing the strength and resilience required for modern infrastructure. Steel’s high resistance to heavy loads and extreme conditions ensures long-lasting reliability with minimal upkeep.

As the world’s most recycled material, steel promotes sustainability without compromising on quality, as recycled steel performs just as well as new. Steel bridges can be constructed efficiently and adapted for diverse uses, from highways and railways to pedestrian bridges and overpasses.

This article explores the essential components, various types, and structures that make steel bridges exceptional for their strength, versatility, and efficiency.

The Components of the Steel Bridge

Steel bridges comprise a range of essential components that work together to ensure the bridge’s strength, stability, and durability, varying based on its type and size. Here are the primary components found in steel bridges:

1. Girder

The primary load-bearing element, steel girders are typically made from steel plates or box girders designed to support large dynamic and moving loads. Girders provide lateral support and contribute to the overall structural balance of the bridge.

2. Beam

Steel beams support the primary load and connect each pier or pillar. These beams may come in I-beam, H-beam, or truss shapes, crafted to bear loads from the bridge’s upper sections. Flexible options, like plate beams or box girders, are often used to distribute weight efficiently.

3. Column

Columns serve as the vertical supports of the bridge, linking the structure to its foundation. For bridges over water, steel columns are often reinforced with concrete for additional corrosion resistance. Steel casings may be used temporarily or permanently during the concrete casting process in water-based foundations.

4. Deck

The bridge deck is the surface on which vehicles or pedestrians travel, typically made of reinforced concrete or steel. In modern designs, bridge decks use composite deck slabs, which incorporate galvanized steel plates for reinforcement and formwork for concrete pouring. These plates are fastened to beams or girders by connectors or welding.

5. Truss

The truss distributes the load evenly across the bridge structure, reducing stress on individual points. It also enhances structural stability, enabling the bridge to withstand external pressures like wind and earthquakes.

6. Bearing

Bearings allow the bridge to flexibly accommodate thermal expansion or contraction due to temperature changes, supporting the bridge’s long-term stability and durability.

7. Anchor

Anchors stabilize the bridge, particularly in suspension or cable-stayed bridges, where tensile forces in the cables need to be securely transferred to the foundation.

8. Joints

Structural components are joined by flexible or rigid connections, typically through welding or bolted fasteners, to ensure all parts operate as a cohesive, robust bridge structure.

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The Types of Steel Bridges

Based on their structure and construction methods, steel bridges are categorized into several types, each designed to meet specific construction needs in terms of load-bearing capacity and span.

1. Steel Girder Bridge

This type uses girders as the main load-bearing component. There are two common types of girders used in modern steel bridge construction: plate girders and box girders.

Plate girders typically consist of flat steel beams suitable for simple bridge structures, while box girders, with their box shape, offer greater strength to support heavier loads, making them a popular choice for longer spans.

2. Truss Bridge

Steel truss bridges feature a triangular framework that helps distribute the load more evenly across the structure. Using triangular elements allows these bridges to bear heavy loads without deformation.

Truss bridges are ideal for medium to long spans as they offer high stability while utilizing lighter steel materials.

3. Suspension Bridge

Suspension bridges utilize cables or steel chains suspended from main pillars (pylons) and connected to the bridge deck, allowing for extremely long spans.

These steel cables act as the primary support and are anchored at both ends to maintain stability. Suspension bridges are commonly used to cross large bodies of water, such as seas and rivers, and are also suitable for pedestrian bridges over valleys.

4. Cable-Stayed Bridge

In cable-stayed bridges, the bridge deck is directly supported by cables connected to the main tower. This system creates a lighter and more material-efficient structure, as the cables directly pull the main beam at the tower.

By distributing the load through cables, these bridges allow for lower construction height, material savings, and strong resistance to pressure.

5. Steel Arch Bridge

Steel arch bridges, or rigid steel frame arch bridges, feature a robust arched structure capable of supporting heavy loads. This arched design consists of an arch frame and support beams that work together to evenly distribute the load across the arch.

Ideal for projects requiring a classic aesthetic, steel arch bridges offer optimal strength for areas needing durable yet elegant structures.

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The Advantages of Steel Bridges

Steel bridges bring a variety of advantages, making them a preferred choice in modern bridge engineering.

1. High Strength and Resilience

Steel bridges are known for their excellent strength-to-weight ratio, enabling them to support heavy loads and withstand extreme weather. Their exceptional tensile and compressive strength makes them suitable for bridges requiring high load-bearing capacity and durability over the long term.

2. Extended Span Capability

Steel allows bridges to cover long spans with few or no intermediate supports. This characteristic is ideal for crossing large rivers, valleys, or other challenging landscapes, providing both flexibility and efficiency in construction.

3. Fast Construction

Prefabricated steel components streamline the construction process by allowing parts to be produced off-site and assembled on-site. This approach reduces overall construction time by enabling tasks to proceed simultaneously, with the added benefit of enhanced quality and safety through controlled manufacturing.

4. Low Maintenance Requirements

With the right anti-corrosion treatment, steel bridges need minimal maintenance. They are highly resistant to corrosion and structural wear, making them a cost-effective choice over time. Steel’s recyclability and adaptability for relocation, replacement, and reuse make it versatile across different applications.

5. Aesthetic Flexibility

Steel’s versatility allows for creative, visually striking bridge designs. It provides flexibility for architects to create structures that are not only durable but also contribute to the aesthetic appeal of their environment, making steel a popular material for landmark bridges.

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