A bridge is a structure which is built to link two areas of land over an obstacle such as a valley or a body of water like rivers, lakes and oceans.
The basic idea of a bridge is to reduce the distance between two pieces of lands that are separated by an obstacle. It can be anything, from a piece of log to a highly modified man made structure, its basic purpose is to link two areas.
The concept of bridges is not new. For centuries men have been building these structures above water and valleys. These bridges were simple and made of wood, rock or bricks.
Today the bridges have become much modified structures than before and are of various types differing in their structures and their locations. These bridges links cities are stretched over many thousand feet. Roads are also built in these bridges that allow easy travel for the people.
As said, there are many types of bridges; following are some common types of bridges:
A beam bridge is the simplest type of brides. It has a very simple structure and can be made of anything. It can be a simple plank of wood or a complex structure made from shallow steel beams to box girders and concrete.
Basically a beam bridge is a very simple structure which consists of a horizontal beam which can be made of anything and is supported at its ends by piers. Highway overpasses, flyovers or walkways are included in the list of bream bridges.
Famous Bridges Around The World
- Famous Bridges
Many describe a bridge as a structure used a passage over physical obstacles like water, valley or land. A bridge can serve its purpose for rail, pedestrians and road traffic.
Different Types Of Dams
- Types Of Dams
A dam is a barrier built across a water course to hold back or control the water flow. Some dams divert the flow of river water into a pipeline, canal, or channel.
A truss is a structure composed of triangular units that are connected at joints and a truss bridge is a special type of bridge which makes use of this structure.
Basically a truss bridge is composed straight elements connected together with the help of pin joints. These are based on elements joined which are stressed from tension and compression. They may be made of wood and metal. These elements are pulled together by tension.
The principle on which these bridges are made is that a flat bridge is laid at the opening; it is supported on sides by horizontal and diagonal layouts which are added to each side of the bridge.
In the same horizontal and diagonal pattern, a construction is also built above the flat layout to support the bridge from above. This is done so that when weight is applied, all of the parts of the bridge hold together. This allows the bridge to bear and support any weight.
Truss brides are the oldest
type of modern bridges and are also very common.
Arch bridges are very old and have been built by man for thousands of years. As the name suggests these bridges are arch shaped.
To be precise they have a flat beam at top below which is an arch shaped structure supported at both the ends which bear all the weight. In past they were made of stones or bricks but today are built of steel and concrete.
Different Types Of Building Materials
- Types Of Building Materials
Houses are a basic need for every human being. From caves to modern well built houses; houses are fulfilling the need of shelter and protection humans in every age.
To define its structure we may say that an arch bridge is a semicircular structure with supports known as the abutments on each end.
Due to the fact that it has a semicircular structure the weight is transferred to the abutments.
Arch bridges are in constant compression the force of which is pushed outward along the curve of the arch toward the abutments.
A suspension bridge is a type of bridge which is suspended from cables above the water paths.
These bridges are one of the oldest types and were initially built of rope and wood.
The suspension bridges of today are expensive complex structures consisting of high tensile cables on which these bridges are hung.
They are usually light, and strong, suspension bridges can span over the distances of 2,000 to 7,000 feet. So they are the longest type of bridges.
The cables on which the suspension bridges are hung are made of steel and are imbedded in the anchorage of either solid rock or huge concrete blocks.
The weight on the bridge is transferred to the cables which are spread over a large area inside their anchorage so that the load is evenly distributed and the cables cannot break free.
- Famous Dams
A dam is said to be a barrier that confines water. Dams generally are used to retain water, while other structures such as dikes are used to manage or prevent water flow into a region.
- Tallest Buildings
Dubai is a global city and hub for business. Dubai's economy was based on the oil industry, but now its main revenues are from tourism, real estate, and financial services.
fefe33 on March 29, 2015:
this will help me know the different types of bridges and will also help me with school work
prada on April 30, 2012:
it helped me so much
deepu on March 19, 2012:
hero on January 05, 2012:
this will help me with a sience project too!
ashna sambhar on January 03, 2012:
commenter on November 18, 2011:
what about cable stay bridges!?!?!?!?
mr fish on November 02, 2011:
red rose on October 31, 2011:
this will help me for my paper
anon on October 29, 2011:
this is so great for science fair!!!!!! likeOMGGGGGG
unknownnn on October 20, 2011:
really helpful with my project and so are your other pages
omg123 on October 17, 2011:
i love this page its very helpful
hifras on September 25, 2011:
thank u for the article
kalpana on September 03, 2011:
hi on February 16, 2011:
perfect for my sciance fair projet ty!
emma on February 07, 2011:
Vangor7 from Texas on November 29, 2010:
I have always been fascinated with the engineering that goes into bridges. Great article!
a person on November 28, 2010:
this is very helpful helps with every thing
a person on October 23, 2010:
this helps with sciences fair..
William Kovacic from Pleasant Gap, PA on July 17, 2010:
A lot of interesting information. Thank you.