Other Free Encyclopedias » Science Encyclopedia » Science & Philosophy: Boolean algebra to Calcium Propionate

Bridges - Forces Acting On A Bridge, Dynamic Loads, Model Testing, Types Of Bridges, Cantilever Bridges

according materials railroad example

Bridges are structures that join two otherwise inaccessible points of land, such as the two shores of a river or lake, or the two sides of a canyon or deep gully. Bridges are designed to carry railroad cars, motor vehicle traffic, or foot travel by pedestrians and/or animals, or to support pipes, troughs, or other conduits used for the movement of goods and materials, such as an oil pipeline or a water aqueduct.

Humans have been constructing bridges since ancient times. The earliest bridges were probably nothing more than felled trees used to cross rivers or ditches. As civilization advanced, artisans discovered ways to use stone, rock, mortar, and other naturally occurring materials in the construction of longer and stronger bridges. Finally, as physicists and engineers began to develop the principles underlying bridge construction, they incorporated other materials such asiron, steel, and aluminum into the bridges they built.

Bridges can be classified in a number of different ways, according to their intended use (railroad bridge or pedestrian walkway, for example), according to the material of which they are made (steel, wood, or concrete for example), or according to whether they are fixed or moveable. Moveable bridges are used when the height of ships traveling on a waterway will be greater than the floor of the bridge. In such cases, the bridge is built so that the roadway can be raised or pivoted to allow marine traffic to pass under or through it. Probably the most useful way to classify bridges for technical purposes, however, is according to their structural form. There are three major types of bridges: arch, cantilever, and suspension.


User Comments

Your email address will be altered so spam harvesting bots can't read it easily.
Hide my email completely instead?

Cancel or

Vote down Vote up

about 5 years ago

i would like to know wht forces are acting on the sydney habour bridge

Vote down Vote up

over 6 years ago

I wish to know what dynamic load allowance shall be adopted for the 260m pylon to pylon distance cable stayed bridge with two single cell box girder (with total width of c/w of 30m approx.).

Vote down Vote up

over 6 years ago

bummmmmm

Vote down Vote up

over 6 years ago

Body

Vote down Vote up

about 5 years ago

???

Vote down Vote up

6 months ago

Snd me notes about bridge, this is my Id..

Vote down Vote up

about 1 year ago

hfygfdgdgyrgrygreryerggergrtrerrheyegygyergrygyrgggggggggggggggggggggggggggggggggggyrrrrrrrrrrrrrrrrrrrlayyeiyghfdhhghfdgjyr

Vote down Vote up

6 months ago

Snd me notes about bridge, this is my Id..

Vote down Vote up

8 months ago

nd kf akn faf afa af af

Vote down Vote up

10 months ago

Cost-effective relocation services in offered so, that you do not concern about rates only.
http://packersandmovergurgaon.in/
http://packersandmoverdelhi.in/

Vote down Vote up

10 months ago

You can perfectly able to make your moving very hassle and stress free all the time.
http://packersandmoverbangalore.in/
http://packersandmoverhyderabad.in/

Vote down Vote up

10 months ago

We offers high quality relocation services that make your entire services comfortable and convenient.
http://packersandmoverpune.in/
http://packersandmovermumbai.in/
Packers and Movers Blog
http://www.bestpackers.org/