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26-637: The Mathews Bridge is a cantilever bridge in Jacksonville , Florida , which spans the St. Johns River . Constructed in 1953, the bridge brings traffic along the Arlington Expressway between downtown Jacksonville and the Arlington neighborhood. It was named after John E. Mathews , a Florida state legislator and Chief Justice of the 1955 Florida Supreme Court who helped gather funding for

52-664: A cantilever bridge. The Forth Bridge is a notable example of an early cantilever bridge. This bridge held the record for longest span in the world for twenty-nine years until it was surpassed by the Quebec Bridge . The engineers responsible for the bridge, Sir Benjamin Baker and Sir John Fowler , demonstrated the structural principles of the suspended span cantilever by sitting in chairs and supporting their colleague, Kaichi Watanabe , in between them, using just their arms and wooden poles. The suspended span, where Watanabe sits,

78-507: A hinge in the girder. Heinrich Gerber was one of the engineers to obtain a patent for a hinged girder (1866) and is recognized as the first to build one. The Hassfurt Bridge over the Main river in Germany with a central span of 124 feet (38 metres) was completed in 1867 and is recognized as the first modern cantilever bridge. The High Bridge of Kentucky by C. Shaler Smith (1877),

104-651: A new bridge. At this time, only the Acosta Bridge and Main Street Bridge crossed the St. Johns River for vehicle use. Another reason for a new bridge was congestion on the two bridges. John E. Mathews, a state legislator and Chief Justice of the Supreme Court, helped secure funding for a new bridge. The cost of constructing a bridge was $ 11 million to be backed by bonds and toll revenues. Tolls remained for

130-522: A pin, usually after forcing the union point apart, and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge . Such unsupported construction is only possible where appropriate rock is available to support the tension in the upper chord of the span during construction, usually limiting this method to the spanning of narrow canyons. World's longest cantilever bridges (by longest span): Main (river) The Main ( German pronunciation: [ˈmaɪn] )

156-638: A vital part of European " Corridor VII ", the inland waterway link from the North Sea to the Black Sea . In a historical and political sense, the Main line is referred to as the northern border of Southern Germany , with its predominantly Catholic population. The river roughly marked the southern border of the North German Federation , established in 1867 under Prussian leadership as

182-505: Is formed by two cantilever arms extending from opposite sides of an obstacle to be crossed, meeting at the center. In a common variant, the suspended span , the cantilever arms do not meet in the center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or constructed in place using special travelling supports. A common way to construct steel truss and prestressed concrete cantilever spans

208-424: Is in the center. The wooden poles resist the compression of the lower chord , while the outstretched arms support the tension of the upper chord. The placement of the brick counterweights demonstrates the action of the outer foundations. Cantilever Bridge.—A structure at least one portion of which acts as an anchorage for sustaining another portion which extends beyond the supporting pier. A simple cantilever span

234-591: Is the longest tributary of the Rhine . It rises as the White Main in the Fichtel Mountains of northeastern Bavaria and flows west through central Germany for 525 kilometres (326 mi) to meet the Rhine below Rüsselsheim , Hesse . The cities of Mainz and Wiesbaden are close to the confluence. The largest cities on the Main are Frankfurt am Main , Offenbach am Main and Würzburg . It

260-518: Is the longest river lying entirely in Germany (if the Weser - Werra are considered separate). The Main flows through the north and north-west of the state of Bavaria then across southern Hesse ; against the latter it demarcates a third state, Baden-Württemberg , east and west of Wertheim am Main , the northernmost town of that state. The upper end of its basin opposes that of the Danube where

286-405: Is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction, forming a balanced cantilever ; when they attach to a solid foundation, the counterbalancing arms are called anchor arms . Thus, in a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms that extend away from the obstacle. Because of

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312-719: The Fichtel Mountains ; it is 41 km (25 mi) long. In its upper and middle section, the Main runs through the valleys of the German Highlands. Its lower section crosses the Lower Main Lowlands ( Hanau-Seligenstadt Basin and northern Upper Rhine Plain ) to Wiesbaden , where it discharges into the Rhine . Major tributaries of the Main are the Regnitz , the Franconian Saale , the Tauber , and

338-641: The Jacksonville City Council to act again concerning the grating. This initially only resulted in reducing the speed limit and roughing up the grating. In 2007, the bridge underwent a $ 12.9 million deck replacement project to replace the open grating over the center span with a concrete riding surface, and has since been reopened for public use. In the early afternoon on September 26, 2013, the Military Sealift Command ship USNS  1st. Lt. Harry L. Martin collided with

364-547: The Niagara Cantilever Bridge by Charles Conrad Schneider (1883) and the Poughkeepsie Bridge by John Francis O'Rourke and Pomeroy P. Dickinson (1889) were all important early uses of the cantilever design. The Kentucky River Bridge spanned a gorge that was 275 feet (84 metres) deep and took full advantage of the fact that falsework, or temporary support, is not needed for the main span of

390-928: The Nidda . The name Main originates from Latin Moenis , Moenus or Menus . It is not related to the name of the city Mainz (Latin: Mogontiacum or Moguntiacum ). The Main is navigable for shipping from its mouth at the Rhine close to Mainz for 396 km (246 mi) to Bamberg . Since 1992, the Main has been connected to the Danube via the Rhine-Main-Danube Canal and the highly regulated Altmühl river. The Main has been canalized with 34 large locks (300 × 12 m or 984 × 39 ft) to allow CEMT class V vessels (110 × 11.45 m or 360.9 × 37.6 ft) to navigate

416-585: The Coast Guard that the bridge was surveyed and the new height was 146 feet (45 m). This new measurement is 6 feet (1.8 m) lower than the previously published height. No notification of the vessel's height has been published by the Navy, but local news articles report that FDOT has evidence that the vessel's height was also 5 + 1 ⁄ 2 feet (1.7 m) taller than its plans indicated. Cantilever bridge The steel truss cantilever bridge

442-493: The Mathews Bridge until 1989. The John E. Mathews Bridge opened on April 15, 1953. The bridge had a notoriously problematic grating in the center span. After the previous grating wore out, a new one was installed, causing drivers to complain that the replacement was slippery and difficult to cross. That grating was replaced with a new, "state of the art" grating, which also provoked controversy causing citizens to pressure

468-490: The bridge's construction. Originally silver in color, the bridge was painted garnet in 1984 in celebration of Jacksonville's short-lived United States Football League franchise, the Jacksonville Bulls . Discussion on building a bridge to Arlington and the beaches began in the early 20th century when cars became more popular. In 1938 Duval County Commission discontinued ferry service to help encourage support for

494-412: The center span of the Mathews Bridge. The damage caused to the bridge was sufficient that it was closed indefinitely until it could be inspected and repaired. Following repairs, the Mathews Bridge reopened in the early morning of October 29, 2013. Part of the reason of the accident was because the charted height of the bridge was incorrect. The bridge owners (Florida Department of Transportation) notified

520-410: The girder or truss and meant that longer spans could be built. Several 19th-century engineers patented continuous bridges with hinge points mid-span. The use of a hinge in the multi-span system presented the advantages of a statically determinate system and of a bridge that could handle differential settlement of the foundations. Engineers could more easily calculate the forces and stresses with

546-411: The need for more strength at the balanced cantilever's supports, the bridge superstructure often takes the form of towers above the foundation piers. The Commodore Barry Bridge is an example of this type of cantilever bridge. Steel truss cantilevers support loads by tension of the upper members and compression of the lower ones. Commonly, the structure distributes the tension via the anchor arms to

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572-609: The outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads. Prestressed concrete balanced cantilever bridges are often built using segmental construction . Some steel arch bridges (such as the Navajo Bridge ) are built using pure cantilever spans from each side, with neither falsework below nor temporary supporting towers and cables above. These are then joined with

598-661: The river is rather narrow on many of the upper reaches, navigation with larger vessels and push convoys requires great skill. The largest cities along the Main are Frankfurt am Main , Offenbach am Main and Würzburg . The Main also passes the following towns: Burgkunstadt , Lichtenfels , Bad Staffelstein , Eltmann , Haßfurt , Schweinfurt , Volkach , Kitzingen , Marktbreit , Ochsenfurt , Karlstadt , Gemünden , Lohr , Marktheidenfeld , Wertheim , Miltenberg , Obernburg , Erlenbach/Main , Aschaffenburg , Seligenstadt , Hainburg , Hanau , Hattersheim , Flörsheim , and Rüsselsheim . The river has gained enormous importance as

624-543: The total length of the river. The 16 locks in the adjacent Rhine-Main-Danube Canal and the Danube itself are of the same dimensions. There are 34 weirs and locks along the 380 km navigable portion of the Main, from the confluence with the Regnitz near Bamberg, to the Rhine. Most of the weirs or dams along the Main also have turbines for power generation. Tributaries from source to mouth: Left Right Around Frankfurt are several large inland ports. Because

650-710: The watershed is recognised by natural biologists, sea salinity studies (and hydrology science more broadly) as the European Watershed . The Main begins near Kulmbach in Franconia at the joining of its two headstreams, the Red Main ( Roter Main ) and the White Main ( Weißer Main ). The Red Main originates in the Franconian Jura mountain range, 50 km (31 mi) in length, and runs through Creussen and Bayreuth . The White Main originates in

676-409: Was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (450 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework . Engineers in the 19th century understood that a bridge that was continuous across multiple supports would distribute the loads among them. This would result in lower stresses in

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