Eugène Freyssinet

	Eugène Freyssinet Eugène Freyssinet () (13 July 1879 – 8 June 1962) was a French structural and civil engineer. He was the major pioneer of prestressed concrete. Biography Freyssinet was born in at Objat, Corrèze, France. He worked in the ''École Nationale des Ponts et Chaussées'' in Paris, France where he designed several bridges until the First World War intervened. His tutors included Charles Rabut. He served in the French Army from 1904 to 1907 and again from 1914 to 1918 as a road engineer. His most significant early bridge was the three span Pont le Veurdre near Vichy, built in 1911. At the time, the 72.5 metre (238 ft) spans were the longest so far constructed in France although Grafton Bridge a 97.6 metre reinforced concrete bridge had been opened in April 1910 and the Rocky River Bridge in Cleveland Ohio, an 85.34 metre unreinforced bridge had been opened in October 1910. Freyssinet's proposal was for three reinforced concrete truss spans, and was significantly less expensi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	École Polytechnique École may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoie, a French commune * École-Valentin, a French commune in the Doubs département * Grandes écoles, higher education establishments in France * The École, a French-American bilingual school in New York City Ecole may refer to: * Ecole Software This is a list of Notability, notable video game companies that have made games for either computers (like PC or Mac), video game consoles, handheld or mobile devices, and includes companies that currently exist as well as now-defunct companies. ... , a Japanese video-games developer/publisher {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Charles Rabut Charles is a masculine given name predominantly found in English and French speaking countries. It is from the French form ''Charles'' of the Proto-Germanic name (in runic alphabet) or ''karilaz'' (in Latin alphabet), whose meaning was "free man". The Old English descendant of this word was '' Ċearl'' or ''Ċeorl'', as the name of King Cearl of Mercia, that disappeared after the Norman conquest of England. The name was notably borne by Charlemagne (Charles the Great), and was at the time Latinized as ''Karolus'' (as in ''Vita Karoli Magni''), later also as '' Carolus''. Some Germanic languages, for example Dutch and German, have retained the word in two separate senses. In the particular case of Dutch, ''Karel'' refers to the given name, whereas the noun ''kerel'' means "a bloke, fellow, man". Etymology The name's etymology is a Common Germanic noun ''karilaz'' meaning "free man", which survives in English as churl (< Old English ''ċeorl''), which developed its de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Villeneuve-sur-Lot Villeneuve-sur-Lot (; in the Languedocien dialect of Occitan language: ''Vilanuèva d'Òlt'' ) is a town and commune in the southwestern French department of Lot-et-Garonne. The commune was formerly named ''Villeneuve-d'Agen''. Villeneuve-sur-Lot is located 22 km northeast of the commune of Agen and straddles the river Lot. History Villeneuve was founded in 1254 by Alphonse, Count of Poitiers, brother of Louis IX, on the site of the town of Gajac, which had been deserted during the Albigensian Crusade. By the early 20th century, Villeneuve-sur-Lot was an important agricultural centre and had a large trade in plums (''prunes d'ente''); the preparation of preserved plums and the tinning of peas and beans were major industries. The important mill of Gajac stood on the bank of the Lot a little above the town. Population Sights The main quarter of the town is located on the right bank of the Lot River and is linked to the quarter on the left bank by a bridge from the 13th cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Arch Bridge An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are typically used today. History Possibly the oldest existing arch bridge is the Mycenaean Arkadiko Bridge in Greece from about 1300 BC. The stone corbel arch bridge is still used by the local populace. The well-preserved Hellenistic Eleutherna Bridge has a triangular corbel arch. The 4th century BC Rhodes Footbridge rests on an early voussoir arch. Although true arches were already known by the Etruscans and ancient Greeks, the Romans were – as with the vault and the dome – the first to fully realize the potential of arches for bridge construction. A list of Roman bridges compiled by the engineer Colin O'Connor featur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Orly Airport Paris Orly Airport (french: Aéroport de Paris-Orly), commonly referred to as Orly , is one of two international airports serving the French capital, Paris, the other one being Charles de Gaulle Airport (CDG). It is located partially in Orly and partially in Villeneuve-le-Roi, south of Paris, France. It serves as a secondary hub for domestic and overseas territories flights of Air France and as the homebase for Transavia France. Flights operate to destinations in Europe, the Middle East, Africa, the Caribbean and North America. Before the opening of Charles de Gaulle Airport in 1974, Orly was the main airport of Paris. Even with the shift of most international traffic to Charles de Gaulle Airport, Orly remains the busiest French airport for domestic traffic and the second busiest French airport overall in passenger traffic, with 33,120,685 passengers in 2018. The airport is operated by Groupe ADP under the brand Paris Aéroport. Since February 2018, the CEO of the airport has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Creep (deformation) In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increases as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load. Depending on the magnitude of the applied stress and its duration, the deformation may become so large that a component can no longer perform its function – for example creep of a turbine blade could cause the blade to contact the casing, resulting in the failure of the blade. Creep is usually of concern to engineers and metallurgists when evaluating components that operate under high stresses or hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Span (architecture) Span is the distance between two intermediate supports for a structure, e.g. a beam (structure), beam or a bridge. A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines, overhead telecommunication lines, some type of Antenna (radio), antennas or for aerial tramways. The span is a significant factor in finding the strength and size of a beam as it determines the maximum bending moment and Deflection (engineering), deflection. The maximum bending moment M_ and deflection \delta_in the pictured beam is found using: :M_ = \frac :\delta_ = \frac = \frac where :q = Uniformly distributed load :L = Length of the beam between two supports (span) :E = Modulus of elasticity :I = Area moment of inertia Note that the maximum bending moment and deflection occur midway between the two supports. From this it follows that if the span is doubled, the maximum moment (and with it the tensile stress, stress) will quadruple, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Truss A truss is an assembly of ''members'' such as beams, connected by ''nodes'', that creates a rigid structure. In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object". A "two-force member" is a structural component where force is applied to only two points. Although this rigorous definition allows the members to have any shape connected in any stable configuration, trusses typically comprise five or more triangular units constructed with straight members whose ends are connected at joints referred to as ''nodes''. In this typical context, external forces and reactions to those forces are considered to act only at the nodes and result in forces in the members that are either tensile or compressive. For straight members, moments (torques) are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes, as is necessary for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Reinforced Concrete Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars ( rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials. In corrosion engineering terms, when designed correctly, the alkalinity of the concrete protects the steel rebar from corrosion. Description Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Modern reinforced concrete can contain varied reinforcing materials made of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Rocky River Bridge ''Rocky'' is a 1976 American sports drama film directed by John G. Avildsen and written by and starring Sylvester Stallone. It is the first installment in the ''Rocky'' franchise and stars Talia Shire, Burt Young, Carl Weathers, and Burgess Meredith. In the film, Rocky Balboa (Stallone), an uneducated, small-time club fighter and debt collector gets an unlikely shot at the world heavyweight championship held by Apollo Creed (Weathers). ''Rocky'' entered development in March 1975, after Stallone wrote the screenplay in three days. It entered a complicated production process after Stallone refused to allow the film to be made without him in the lead role; United Artists eventually agreed to cast Stallone after he rejected a six figure deal for the film rights. Principal photography began in January 1976, with filming primarily held in Philadelphia; several locations featured in the film, such as the Rocky Steps, are now considered cultural landmarks. With an estimated production ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]