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Types of Bridges

Types of Bridges



Different Types of Bridges

Different Types of Bridges



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    Types of Bridges Types of Bridges Document Transcript

    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)BRIDGEA bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, orany other physical obstacle, for the purpose of providing passage over the obstacle. Designs ofbridges will vary depending on the function of the bridge and the nature of the terrain where thebridge is to be constructed.Types of bridgesThere are six main types of bridges: beam bridges, cantilever bridges, arch bridges, suspensionbridges, cable-stayed bridges and truss bridges.1. Beam BridgeBeam Bridges are a direct descendant of the log bridge; now more commonly made fromshallow steel I beams, box girders, reinforced concrete, or post-tensioned concrete. It isfrequently used in pedestrian bridges and for highway overpasses and flyovers. As is its ancestor,this bridge is in structural terms the simplest of the many bridge types.Bridge 1 A steel pedestrian footbridge over a busy road in Swansea, Wales (UK).2. Cantilever bridgeA cantilever bridge is a bridge built using cantilevers, structures that project horizontally intospace, supported on only one end. For small footbridges, the cantilevers may be simple beams;however, large cantilever bridges designed to handle road or rail traffic use trusses built fromstructural steel, or box girders built from prestressed concrete. The steel truss cantilever bridgewas a major engineering breakthrough when first put into practice, as it can span distances of1
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)over 1,500 feet (460 m), and can be more easily constructed at difficult crossings by virtue ofusing little or no false work.Bridge 2 Forth Bridge Edinburgh.3. Arch bridgeAn arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridgeswork by transferring the weight of the bridge and its loads partially into a horizontal thrustrestrained by the abutments at either side. A viaduct (a long bridge) may be made from a seriesof arches, although other more economical structures are typically used today.Bridge 3 Alcántara roman Bridge, Spain.Types of Arch Bridge Aqueducts and canal viaducts Supported deck arch bridge Suspended deck arch bridge2
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com) Tied arch bridge4. Suspension bridgeA suspension bridge is a type of bridge where the main load-bearing elements are hung fromsuspension cables. While modern suspension bridges with level decks date from the early19th century, earlier types are reported from the 3rd century BC. Simple suspension bridges,for use by pedestrians and livestock, are still constructed, based upon the ancient Inca ropebridge.Bridge 4 Tsing Yi-Ma Wan, Hong Kong5. Cable-stayed bridgesA cable-stayed bridge is a bridge that consists of one or more columns (normally referred to astowers or pylons), with cables supporting the bridge deck..3
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)Bridge 5 The Rio-Antirio bridge in GreeceTypes Side-spar cable-stayed bridge Cantilever-spar cable-stayed bridge Multiple span cable-stayed bridge Extra dosed bridge Cable-stayed cradle System Bridge6. Truss bridgeA truss bridge is a bridge composed of connected elements (typically straight) which may bestressed from tension, compression, or sometimes both in response to dynamic loads.Truss bridges are one of the oldest types of modern bridges.4
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)Bridge 6 General Hertzog Bridge over the Orange River at Aliwal NorthUseA bridge is designed for trains, pedestrian or road traffic, a pipeline or waterway for watertransport or barge traffic. An aqueduct is a bridge that carries water, resembling a viaduct, whichis a bridge that connects points of equal height. A road-rail bridge carries both road and railtraffic.AbuseBridges are subject to unplanned uses as well. The areas underneath some bridges have becomemakeshift shelters and homes to homeless people, and the undersides of bridges all around theworld are spots of prevalent graffiti. Some bridges attract people attempting suicide, and becomeknown as suicide bridges.Double-decker BridgeDouble-decker bridges have two levels, such as the San Francisco – Oakland Bay Bridge, withtwo road levels. Tsing Ma Bridge and Kap Shui Mun Bridge in Hong Kong have six lanes ontheir upper decks, and on their lower decks there are two lanes and a pair of tracks for MTRmetro trains. Some double-decker bridges only use one level for street traffic; the Washington5
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)Avenue Bridge in Minneapolis reserves its lower level for automobile traffic and its upper levelfor pedestrian and bicycle traffic (predominantly students at the University of Minnesota.Bridge 7 Moscows Vorobyovy Gory metro station of Sokolnicheskaya Line (at night).6
    • Shahadat Hossain Shakil (shshakil.buet@gmail.com)Avenue Bridge in Minneapolis reserves its lower level for automobile traffic and its upper levelfor pedestrian and bicycle traffic (predominantly students at the University of Minnesota.Bridge 7 Moscows Vorobyovy Gory metro station of Sokolnicheskaya Line (at night).6