Introduction of Bridge
Human beings have been constructing pier bridges for about four thousand years.
The oldest and still existing bridge in the world is perhaps the Zhaozhou Bridge in Hebei Province in China, originally constructed approximately in A.D. 600.
However, bridge design and construction then may not be considered bridge engineering practice by today’s definition. Instead, work was done based more on experience as opposed to quantitative planning as done now.
Bridge engineering today uses calculus-based analysis and detailed planning.
Materials used in bridge construction have also changed noticeably through a good number of years, from mainly natural materials such as stones and wood than to mainly man-made materials such as steel and Portland cement concrete today.
Due to great improvement in the strength and production quality control of these materials, bridge components have become smaller, thinner, skinnier, and lighter to reduce self-weight and be more economical.
In 1866 Ways and Koenen in Germany conducted a series of tests on reinforced concrete beams (Heins and Lawrie, 1984), which started the era of concrete for bridge construction.
More tests and research work were done in the following decades. The first bridge using reinforced concrete in the world was credited to Monier in 1867 (Heins and Lawrie, 1984).
The first bridges using steel are believed to be constructed in the United Kingdom and the United States in the 1880s.
These pioneering projects began what is known today as modern bridge engineering. Another important aspect characterizing modem bridge engineering is the tools used to perform quantitative modeling and planning.
They include calculus and calculus-based mechanics, acknowledged as the foundation of modem bridge engineering as practiced today.
This knowledge was established in the seventeenth century.
With the new materials and advanced analysis tools, the fast development of modem bridge engineering had its technical strength.
The fuel for substantial developments of bridge engineering was the need or desire for economic development, For example, today’s highway bridge technology in the United States is largely a result of the rapid development of the interstate highway system in the 1950s and 1960s after World War II.
As a product, a comprehensive highway system has been established, consisting of about 50,000 miles of roadways and about 600,000 bridges.
It is also interesting to mention that a number of developing countries are currently experiencing a similar “boom” in their surface transportation systems.
This has become the driving force for bridge engineering development in those parts of the world.
Also, read: Classification of Bricks
Types of Bridge
- Bridges by Structure
- Arch Bridges
- Beam Bridges
- Truss Bridges
- Cantilever Bridges
- Tied Arch Bridges
- Suspension Bridges
- Cable-Stayed Bridges
- Fixed or Moveable Types
- Fixed Bridges
- Temporary Bridges
- Moveable Bridges
- Pedestrian Bridges
- Types by Use
- Pedestrian Bridges
- Double-decked Bridges
- Train Bridges
- Pipeline Bridges
- Commercial Bridges
- Types by Materials
- Natural Materials
- Concrete and Steel
- Advanced Materials
- Fictional and Mythical Bridges
Parts of Bridge Structures
- Major Parts of Bridge Structures as below
- Girder or Beam
- Substructure Components
- Bridge Tower
- Pier Cap
- Pile Cap and Piles
- Bridge Anchor
- Suspension Cable
What is Pier?
This pier of a bridge provides vertical supports for spans at intermediate points and performs both main functions: transferring vertical superstructure loads to the foundations and resisting horizontal forces acting on the bridge.
Even in some low seismic areas, designers are paying more attention to this ductility aspect of the design.
This Steel, to a lesser degree, is also used for piers.
The Steel tubes filled with concrete columns have gained more attention recently.
The piers or columns for conventional bridges, such as grade separations, overcrossing, overheads, underpasses, and simple river crossings.
Substructures for arch, suspension, segmental, cable-stayed, and movable bridges are excluded from the substructures for some of these special types of bridges.
Types of Bridge Piers
1. Solid Piers
a. Solid Masonry Piers
b. Solid Reinforced Concrete Piers
2. Open Pier
a. Cylindrical Piers
b. Column Piers or Column Bent
c. Pile Pier or Pile Bents
d. Trestle Pier or Trestle Bent
e. Masonry Piers
f. Mass Concrete Piers
g. Reinforced and Prestressed Concrete Piers
h. Fixed Piers
i. Hammerhead or Cantilevered Piers
j. Special Shaped Bent
k. V-Shaped Concrete Pier