Category Archives: bridges

Types of Bridges – Top 7 Bridge Design Types and Principles

Types of Bridges in civil engineering can range from modest constructions to massive, eye-catching pieces of art – and everything in between. A bridge serves its sole purpose as long as it transports us across a gap. The required passage may be for a road, train, pedestrians, canal, or pipeline. A river, a road, a railway, or a valley may be crossed. Types of bridges are an important classification in civil engineering. In today’s blog, we are going to learn about different types of bridges in detail.

Types of bridges and Bridges design types in civil Engineering

The types of bridges are broadly classified as follows on the basis of form and type of superstructure

  • Arch Bridge
  • Beam bridge
  • Cantilever bridge
  • Suspension bridge
  • Cable-Stayed Bridge
  • Tied-Arch Bridge
  • Truss Bridge

Let’s dig deeper into each of the types now.

Arch Bridge – Types of Bridges

Arch Bridge
Arch Bridge
  • A dead load of a bridge is the weight of the bridge itself, plus the weight of whatever it is carrying (the live load). The forces of load and gravity, which would otherwise send a bridge sliding downhill, are used to hold an arch bridge aloft instead. 
  • An arch bridge works by channelling gravity’s downward force into the structure’s centre — toward a central stone known as the keystone — rather than straight down.
  • Compression is the principle that allows the arch below to support the surface, or deck, above it.
  • Temperature changes can destabilise fixed arch bridges, hence the arch design is occasionally changed with hinges at each base and even the span’s centre.
  • This allows longer arch bridges to adjust to material expansion and contraction when temperatures fluctuate.

Also read: Bridge components explained – Types and functions.

Beam Bridge – Types of bridges

The beam bridge was the first form of bridge ever created due to its simplicity. It is still the most cost-effective to construct. All you need is a crossbeam that spans the gap and is supported at each end by an abutment. A girder bridge is a form of beam bridge that uses steel girders for reinforcement. 

beam bridge
beam bridge
  • Gravity presents a greater issue when creating a bridge since, unlike a building, the majority of the space beneath it is empty.
  • To resist gravity and bear the full load, a beam bridge might be supported merely by two abutments, one at each end.
  • But there’s a catch with beam bridges: the longer a bridge is and the more people, cars, and other objects it carries, the heavier the entire weight becomes.
  • The more abutments on a beam bridge are spaced apart, the less stable the structure becomes. 
  • You may make a long, stable bridge by putting supports in the middle, known as piers or stanchions, and connecting sections between them.
  • The Yolo Causeway in Sacramento, California, is 3.2 miles long, and the Lake Pontchartrain Causeway in Louisiana is 24 miles long.
  • The force of compression drives the weight inward onto piers in the middle of the bridge in beam bridges.
  • Simultaneously, the tension pulling or stretching force pulls the load outward toward the bridge’s abutments on both ends.

Also read: Highway Engineering- Definition, Importance and Construction Details

Cantilever Bridges Types

Cantilever construction is used on some bridges.

  • This design uses a vertically anchored pillar to support a horizontal deck that extends out from one or both sides across the span.
  • Both the above and below are frequently used to support the load.
  • A good example of cantilever construction is a diving board or platform.
cantilever bridge
cantilever bridge

Suspension Bridge Types

Suspension bridges are exactly what they sound like: they’re supported by vertical pillars or pylons that are linked by suspension cables.

Suspension bridge
Suspension bridge
  • Smaller, vertical suspenders are attached to these main cables and use tension to hold the bridge deck up.
  • Tension is the main force that sustains these types of bridges.
  • Despite the fact that the original suspension bridges were composed of simple ropes supporting wooden planks, the suspension technique now allows for vast spans across wide canals.
  • However, because these bridges are only attached to the ground in a few locations, they might shake when heavy traffic passes beneath them.
  • Vibrations can be caused by wind or movement across a bridge.
  • When these reach a specific frequency, resonance occurs, which is the same mechanism that causes the glass to shatter when a trained vocalist hits a high enough note.
  • Bridge crossings can be disrupted and collapsed if vibrations are strong enough. 
  • Torsion, a twisting force commonly generated by external variables such as wind, can also impact these bridges, causing unsafe movement.
  • Travelers can be thrown off a bridge if the surface twists significantly while they are on it.
  • While torsion causes tension in a vertical plane, shear causes stress in a horizontal plane.
  • It occurs when opposing environmental pressures act on a single, fixed component of a bridge, causing it to break like a stick between two hands.

Also read: Cofferdams – Types & Construction methods

Cable-Stayed Bridge

  • A suspension bridge with a cable-stayed bridge connects the crossbeam or bridge deck directly to pillars or towers.
  • There is no main cable, only a slew of vertical suspenders attached to the tower’s summit.
  • Tension is used by these suspenders to keep the bridge deck solid and in place.
Cable Stayed Bridge
Cable Stayed Bridge

Tied-Arch Bridge

  • The qualities of an arch bridge and a suspension bridge are combined in a tied-arch bridge.
  • It supports an arched structure with horizontal force from both sides, similar to a normal arch bridge.
  • Instead of supporting the building from below, the arch rises over the road, with vertical ties descending to provide additional decking support. 
  • Because they resemble a bow from the side, these are sometimes known as bowstring bridges.
  • This bow supports the weight and keeps the bridge stable by combining the tension of its vertical cables with the compression of the arch.
Tied arch bridge
Tied arch bridge

Also read: Golden Gate Bridge: Design and 2 Main Issues

Truss Bridge

  • The load on a truss bridge is distributed across a succession of tiny sections that are joined together.
  • Bridge trusses are typically formed by structural beams for smaller bridges or box girders for bigger bridges, and are joined in a sequence of triangles by welded or riveted joints. 
  • The bridge is held up by tension from vertical steel or timber supports, while compression from diagonal truss supports adds stability by directing the weight toward the centre, similar to an arch.
Truss bridge
Truss bridge

That’s it about the main types of bridges. Each of these has advantages and disadvantages. We need to decide on the type of bridge based on the requirements.

Let me know in the comments if you need any further information.

Happy learning!

Component of a bridge|Bridge components-Types, functions

Component of a bridge/ bridge components plays a very important role in maintaining the stability and functional requirements of the bridge structure. Each bridge component has its functions. The bridge component types and functions vary as per the site conditions, design requirements, and functional requirements. This article is about a total overview of the components of bridge/bridge components.

A bridge is a structure built over physical obstacles such as water bodies like rivers, lakes, canals, etc, and valleys, roads, etc with minimal obstructing to the area below. During ancient times bridges are made by falling of trees, providing stepping stones, and by tying a rope from the trees. Bridges are the most important components of a highway, railway, and urban roads. Brides play an important role in the socio-economic, politics, culture, defence, etc of a region and a country.

  1. Component of a bridge / Bridge components
    1. Bridge components – Substructure
      1. Bridge components – Abutments
        1. Types of Abutments
      2. Wing walls and return walls
      3. Piers
      4. Foundation
    2. Component of a bridge – Super structure or decking components
      1. Bridge bearings
      2. Decking components
  2. Latest posts

Also read : Components of a road – Elements and their function

Also read : Components of a railway track – Types and functions

Component of a bridge / Bridge components

The components of the bridges are divided broadly into ..

Components of a bridge
Components of a bridge

a) Sub- structure

c) Super structure or decking component

Components of a bridge below the bearing constitute substructure and components above the bearings constitute superstructure or decking components.

You tube video – Components of a Bridge


Bridge components – Substructure

The main function of the substructure is to support the superstructure components and transfer the loads to safe strata. The major substructure components of a bridge are as follows.

a) Abutments

b) Wing walls and return walls

c) Piers

d) Pier cap

e) Foundation

Components of a bridge
Components of a bridge

Bridge components – Abutments

Abutments functions as vertical supports to the superstructure components at the bridge end. They are the endpoints of a bridge and acts as an approach for the roadway. Abutments retain the roadway backfill and base materials and act as lateral support to the embankments approach. Because of these properties, the abutments are designed as retaining structures.

A single span bridges got two abutments which serves as a vertical support and lateral support. Abutments also resist lateral movement of earth fill of the road approaches.

components of abutment
components of abutment

Abutment are of various types depending on the design requirements and load considerations.

Cross section of abutment
Cross section of abutment
Types of Abutments
  • Closed Abutment
  • Stub or Perched Abutment 
  • Pedestal or Spill-through Abutment
  • Integral End Bents
  • Mechanically Stabilized Abutment

Wing walls and return walls

Wing walls are located near to the abutments as an extension of abutments or as independent structures. They act as a retaining wall to resist the earth in the approach areas. Wing walls may be placed right-angled to the approach way or splayed as shown in the figure.


Piers are intermediate vertical supports provided between bridge spans. The main function of a pier is to transfer the loads coming on the superstructure to the foundations. Pier got pier caps to provide sufficient bearing areas for the transfer of superstructure loads.

Piers are basically compression members and are designed for vertical loads but in high seismic areas they are designed for lateral loads also.



Foundations are constructed to transfer loads coming on the superstructure and substructure to a larger area and hard strata. The foundations may be an open foundation or pile foundation or some other foundation type depends upon nature or soil strata and design considerations. The foundation has to be provided at sufficient depth to ensure protection and chances of failure against the scouring and undermining process.

Also read : Foundation types – Shallow and deep foundations

Also read : Pile foundations – Types and advantages

Component of a bridge – Super structure or decking components

The superstructure constitutes deck slabs, deck beams/girders, trusses, cables, arches, handrails, parapet, etc. The superstructure components depend on the type of bridge-like concrete, composite, steel, etc. The following are the basic superstructure components.

a) Bearings

b) Bridge deck

Bridge bearings

Bridge bearings are components of the bridge that provides a resting surface between the bridge pier and the bridge deck. The main function of the bearing is to control movements and reduces the stresses involved.

A bridge bearing carries the loads or movement in both vertical and horizontal directions from the bridge superstructure and transfers those loads to the bridge pier and abutments. The loads can be live load and dead load in vertical directions, or wind load, earthquake load, etc., in horizontal directions.

Bridge bearing

Decking components

Decking is the surface over which the traffic like road or rail passes. The decks are supported on beams, girders (prestressed or post-tensioned ) viaducts, prefabricated segments, steel girders or hanged through cables. The whole decking components are supported by pier which transfer the loads to reliable soil strata.

The deck beams shall be conventional rectangular type or of I – GIRDERS (Concrete or steel)

Types of Deck support beams
Types of Deck support beams

The surface of the deck may be of the concrete or bituminous for movement of traffic.


There are a lot of miscellaneous components like strip seal expansion joints which separates the deck spans, Hand rails are provided on the deck side as a barrier and protection.

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