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.
9-449: The Nyali Bridge is a concrete girder bridge connecting the city of Mombasa on Mombasa Island to the mainland of Kenya and located on B8 road . The bridge crosses Tudor Creek (a tidal inlet) to the north-east of the island. The bridge is one of three road links out of Mombasa (the others being the Kipevu and Makupa Causeways ). The Likoni Ferry provides a third transport link to
18-409: Is 330 metres prestressed continuous box girder over three spans with the centre span of 150 metres. The outer spans are 90 metres each. The bridge is founded on piled foundation . The newer Nyali Bridge includes an approach bridge with three spans totalling 61.65 metres whose superstructure is simply reinforced concrete beams and deck. Since its completion in 1980, no periodic maintenance was done to
27-408: 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
36-462: 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
45-404: 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
54-644: The bridge until 2005 when major repairs to the bridge were carried out. The repairs included post tensioning the box girder and shear strengthening using crack sealing and use of steel plates on the internal face of the box girder. 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"
63-414: The island, and is situated at the southern tip. The mainland approach to the bridge serves as a police checkpoint in both directions. The Old Nyali Bridge (a floating bridge ) stood approximately 800 m downstream from the current crossing. The floating bridge was commissioned by Governor Joseph Byrne in 1931. It is 391.65 metres long and 26.3 metres wide with a total of six lanes. The main bridge
72-401: 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
81-487: 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
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