|
Cantilever Bridge
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers). For small footbridges, the cantilevers may be simple beam (structure), beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete. The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over , and can be more easily constructed at difficult crossings by virtue of using little or no falsework. Origins Civil engineer, Engineers in the 19th century understood that a bridge continuous across multiple supports would distribute the loads among them. This would result in lower stresses in 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Pflimlin Bridge
The Pierre Pflimlin Bridge () is a long motorway cantilever bridge over the river Rhine, with a main span measuring . It connects Germany and France, at Kehl and Strasbourg. It is named after Pierre Pflimlin, a former List of Prime Ministers of France, French prime minister, and was opened in 2002. It was funded by France, Germany and the European Union. Construction Planned for several decades, it was built during the late 1990s and early 2000s by the construction companies Bilfinger Berger and Max Früh. *The central segments (located over the river) were built in Cantilever bridge#Function, balanced cantilever, cast-in-place fashion, extending outwards from each of the two pylon islands constructed in the stream. A concrete volume of 18.000 m3, 760 t of prestressing steel, and 2.700 t of reinforcing steel were used in total. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Box Girder
A box girder or tubular girder (or box beam) is a girder that forms an enclosed tube with multiple walls, as opposed to an i-beam, - or H-beam. Originally constructed of wrought iron joined by riveting, they are now made of rolled steel, rolled or welded steel, aluminium extrusions or prestressed concrete. Compared to an i-beam, -beam, the advantage of a box girder is that it better resists Torsion (mechanics), torsion. Having multiple vertical Web (other)#Engineering, webs, it can also carry more load than an of equal height (although it will use more material than a taller -beam of equivalent capacity). The distinction in naming between a box girder and a tubular girder is imprecise. Generally the term ''box'' girder is used, especially if it is rectangular in section. Where the girder carries its "content" ''inside'' the "box", such as the Britannia Bridge, it is termed a ''tubular'' girder. ''Tubular'' girder is also used if the girder is round or oval in cross-sec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Conrad Schneider
Charles Conrad Schneider (; April 24, 1843 – January 8, 1916), often referred to as C. C. Schneider, was an American civil engineer and bridge designer. Schneider was also a member and president of the American Society of Civil Engineers. Biography Schneider was born in Apolda in the Grand Duchy of Saxe-Weimar-Eisenach. He graduated from the Royal Technical School at Chemnitz, Germany, in 1864, after which he worked as a mechanical engineer. He emigrated to the United States in 1867, where he worked for the Paterson Locomotive Works in New Jersey for four years before moving to Detroit to work for the Michigan Bridge and Construction Company. In 1875, he went to New York City to help review proposals for the Blackwell's Island Bridge across the East River (which would eventually be completed in 1909 and later came to be known as the Queensboro Bridge). While in New York, he met Charles Macdonald and worked with him for the next year at the Delaware Bridge Company. He married ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niagara Cantilever Bridge
The Niagara Cantilever Bridge or Michigan Central Railway Cantilever Bridge was a cantilever bridge across the Niagara Gorge. An international railway-only bridge between Canada and the United States, it connected Niagara Falls, New York, and Niagara Falls, Ontario. It was replaced by the Michigan Central Railway Steel Arch Bridge in 1925. History Michigan Central Railway commissioned the Niagara Cantilever Bridge as a more cost effective alternative to leasing from the Lower Arch Bridge. Charles Conrad Schneider, the architect, chose a cantilever design due to the geography of the Niagara Gorge Niagara Gorge is an long canyon carved by the Niagara River along the Canada–United States border, between the U.S. state of New York (state), New York and the Provinces and territories of Canada, Canadian province of Ontario. It begins at the .... Construction began in 1883. Boston cement was used for the foundation. The bridge was completed within months as a deadline was impo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Bridge Of Kentucky
The High Bridge is a railroad bridge crossing the Kentucky River Palisades, in Kentucky. The bridge, about 275 feet over the river below, connects Jessamine and Mercer counties. It was formally dedicated in 1879, and is the first cantilever bridge built in the United States. It has a three-span continuous under-deck truss, which is used by Norfolk Southern Railway to carry trains between Lexington and Danville. The High Bridge is a National Historic Civil Engineering Landmark. History In 1851, the Lexington & Danville Railroad, with Julius Adams as chief engineer, retained John A. Roebling (who later designed the Brooklyn Bridge) to build a railroad suspension bridge across the Kentucky River for a line connecting Lexington and Danville, Kentucky, west of the confluence of the Dix and Kentucky rivers. In 1855, the company ran out of money, having built only stone towers and anchorages. The project was resumed by the Cincinnati Southern Railway in 1873 following a pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cantilever Bridge Human Model
A cantilever is a rigid structural element that extends horizontally and is unsupported at one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab. When subjected to a structural load at its far, unsupported end, the cantilever carries the load to the support where it applies a shear stress and a bending moment. Cantilever construction allows overhanging structures without additional support. In bridges, towers, and buildings Cantilevers are widely found in construction, notably in cantilever bridges and balconies (see corbel). In cantilever bridges, the cantilevers are usually built as pairs, with each cantilever used to support one end of a central section. The Forth Bridge in Scotland is an example of a cantilever truss bridge. A cantilever in a traditionally timber framed building is called a jetty or forebay. In the southern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Main (river)
The Main () is the longest tributary of the Rhine, one of the major List of rivers of Europe, European rivers. It rises as the White Main in the Fichtel Mountains of northeastern Bavaria and flows west through central Germany for 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 is the longest river lying entirely in Germany (if the Weser-Werra are considered separate). Geography The Main flows through the north and north-west of the States of Germany, state of Bavaria and 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 drainage basin, basin opposes that of the Danube where the watershed is recognised by natural biologists, sea salinity studies (and hydrology science more broadly) as the Eu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heinrich Gerber (civil Engineer)
Heinrich Gerber (Johann Gottfried Heinrich Gerber; November 18, 1832 in Hof, Bavaria – January 3, 1912 in Munich, Germany) was a German civil engineer and inventor of the Gerber girder. He received several patents for his systems for building bridges. Background Gerber studied at the Polytechnic schools in Nuremberg and Munich, and in 1852 he joined the Bavarian Staatsbaudienst, where he worked on the railways. He assisted in the design of the Großhesseloher bridge and helped to develop the Pauli girder used in the bridge. After its completion in 1857, Gerber was appointed chief engineer of the Maschinenfabrik Klett bridge department in Nuremberg. When the company in 1859 was awarded the contract for the construction of the railway bridge over the Rhine at Mainz he decided to manufacture the bridge parts in a temporary facility near the site in Gustavsburg. Gerber moved in 1860 with his family to the assembling site in order to manage the manufacture and constructi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statically Determinate
In statics and structural mechanics, a structure is statically indeterminate when the equilibrium equations force and moment equilibrium conditions are insufficient for determining the internal forces and reactions on that structure. Mathematics Based on Newton's laws of motion, the equilibrium equations available for a two-dimensional body are: : \sum \mathbf F = 0 : the vectorial sum of the forces acting on the body equals zero. This translates to: :: \sum \mathbf H = 0 : the sum of the horizontal components of the forces equals zero; :: \sum \mathbf V = 0 : the sum of the vertical components of forces equals zero; : \sum \mathbf M = 0 : the sum of the moments (about an arbitrary point) of all forces equals zero. In the beam construction on the right, the four unknown reactions are , , , and . The equilibrium equations are: : \begin \sum \mathbf V = 0 \quad & \implies \quad \mathbf V_A - \mathbf F_v + \mathbf V_B + \mathbf V_C = 0 \\ \sum \mathbf H = 0 \quad & \implie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hinge
A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom. Hinges may be made of flexible material or moving components. In biology, many joints function as hinges, such as the elbow joint. History Ancient remains of stone, marble, wood, and bronze hinges have been found. Some date back to at least Ancient Egypt, although it is nearly impossible to pinpoint exactly where and when the first hinges were used. In Ancient Rome, hinges were called cardō and gave name to the goddess Cardea and the main street Cardo. This name cardō lives on figuratively today as "the chief thing (on which something turns or depends)" in words such as ''cardinal''. According to the Oxford English Dictionary, the English word ''h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
