Types of Bridges & Bridge Components



In this article I am going to show you that what are the types of bridge and bridge components in detail. After reading this article you will now the little bit knowledge about bridge.

What is Bridge?

Bridge is a structure that has the heaviest responsibility in carrying a free flow of traffic • Width of the bridge (number of lanes) dictates the traffic volume of a road segment • The Load Carrying Capacity of a bridge would dictate the weight of truck allowed to cross the bridge (load limits can be poste.

 

Types of Bridge.

1: Girder Bridge
2:Arch Bridge
3: Truss Bridge
4: Suspension Bridge
 5: Cable-Stayed Bridge

1:Girder Bridge

  • Most commonly constructed.
  • Usually used for Short and Medium spans (up to 50 m).
  • Structural Action is to carry load in Shear and Flexural.
  • Economical and long lasting solution for vast majority of bridges.
  • Decks and girder usually act together to support the entire load in highway bridges.

2:Arch Bridges

Arch bridges are one of the oldest types of bridges and  it has been around for thousands of years. Arch bridges have great natural strength. which is using a lot because it support the heavy load.

Arch action reduces flexural stresses (that is Tensile Stresses )

• Arch is predominantly a compression member. Buckling needs attention. • Can be economical as compared to equivalent straight simply supported girder or truss bridge

• Suitable site would be Valley which has strong foundations on a rocks

• Generally conventional curved arch rib has high fabrication & erection costs

• Erection easiest for Cantilever Arch and most difficult for Tied Arc.



 

 

3: Truss Bridges

• The primary member forces are axial tension or compression.

• The open web system allows deep girders than for an equivalent solid web girder.

• This may lead to economy in material and reduced dead weight.

• The cost fabrication and maintenance is high.

• The truss is attractive choice in suspension bridges due to its superior aerodynamic behavior.

• Truss results in light structure that can be assembled member by member using small lifting capacity equipment.

4: Suspension Bridges

  • Suspension bridge is a type of bridge which has cables between towers (so called “suspension cables”) and from them vertical “suspender cables” (or hangers”) that hold the deck. Suspension cables are anchored at each end of the bridge and they carry the majority of the load.
  • Major element is a flexible cable, that transfers the loads to the towers and anchorage.
  •  This cable is from High Strength wires
  • The deck is hung from the cable by Hangers also of high strength ropes (in tension)  Suitable for very long .          spans.
  •  Expensive to build and maintain.

5:Cable-Stayed Bridges

 

  • In comparison to suspension bridge, the cables are straight rather than curved. Therefore the stiffness is greater.
  •  The cables are anchored to the deck.
  • All individual cables are shorter than full length of the superstructure.  Economical over 100-350m, some bridges are as long as 800m.
  • No such bridge built in Pakistan as yet but two are in design phase to be constructed in AJK.
  • It is used in places where spans need to be longer than cantilever bridge can achieve (because of its weight), but the span is short enough so a suspension bridge is not practical there economically.



Tags:

Add a Comment

Your email address will not be published. Required fields are marked *