A girder bridge is a bridge that uses girders as the means of supporting its deck . The two most common types of modern steel girder bridges are plate and box.
7-538: Fort Road Bridge is a girder bridge that spans the Mississippi River between Saint Paul , and Fort Snelling, Minnesota , United States. It was built in 1960 by the Minnesota Department of Transportation and was designed by Sverdrup & Parcel Engineering Company . It is the third bridge on the site. The first bridge, a deck girder bridge , was built in 1880. The second bridge, a metal arch bridge ,
14-408: Is no longer a true girder bridge. Girder bridges have existed for millennia in a variety of forms depending on resources available. The oldest types of bridges are the beam , arch and swing bridges, and they are still built today. These types of bridges have been built by human beings since ancient times, with the initial design being much simpler than what we utilize today. As technology advanced
21-462: Is typically used to refer to a steel beam. In a beam or girder bridge, the beams themselves are the primary support for the deck, and are responsible for transferring the load down to the foundation. Material type, shape, and weight all affect how much weight a beam can hold. Due to the properties of the second moment of area , the height of a girder is the most significant factor to affect its load capacity. Longer spans, more traffic, or wider spacing of
28-404: The beams will all directly result in a deeper beam. In truss and arch -style bridges, the girders are still the main support for the deck, but the load is transferred through the truss or arch to the foundation. These designs allow bridges to span larger distances without requiring the depth of the beam to increase beyond what is practical. However, with the inclusion of a truss or arch the bridge
35-401: The methods were improved and were based on the utilization and manipulation of rock, stone, mortar and other materials that would serve to be stronger and longer. In ancient Rome , the techniques for building bridges included the driving of wooden poles to serve as the bridge columns and then filling the column space with various construction materials. The bridges constructed by Romans were at
42-487: The time basic but very dependable and strong while serving a very important purpose in social life. As the Industrial Revolution came and went, new materials with improved physical properties were utilized; and wrought iron was replaced with steel due to steel's greater strength and larger application potential. All bridges consist of two main parts: the substructure, and the superstructure. The superstructure
49-584: Was built by 1912. This article about a bridge in Minnesota is a stub . You can help Misplaced Pages by expanding it . Girder bridge The term "girder" is often used interchangeably with "beam" in reference to bridge design. However, some authors define beam bridges slightly differently from girder bridges. A girder may be made of concrete or steel. Many shorter bridges, especially in rural areas where they may be exposed to water overtopping and corrosion, utilize concrete box girder. The term "girder"
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