Louis-Jean Résal
Introduction Portrait of Louis-Jean Résal'''Jean Résal''' (22 October 1854, in Besançon – 14 November 1919, in Paris) was a French civil engineer. He was a professor of mechanical engineering at the École polytechnique, and designed several metal bridges in France, especially bridges above the Seine in Paris:The career of the brilliant student of the École des ponts ParisTech was always an upward ladder: service in the Roads and Bridges Department at the Loire-Atlantique Département and thereafter in the shipping authority in Paris. Résal succeeded the student of Saint-Venant, ''Alfred-Aimé Flamant'' (1839-1915), at the Chair of Strength of Materials at the École des ponts ParisTech in 1892.Although Résal had already published a two-volume work on arch bridges together with ''Ernest Degrand'' (1822-1892), he concentrated on the theory and practice of steel bridges from a very early stage and had a profound influence on steel bridges at the transition from the discipline-formation to the consolidation period of theory of structures. * Nantes Résal Bridge (rail), destroyed during the Second World War, rebuilt in concrete* Road bridge over the Erdre (Nantes), appointed first bridge Barbin, then Pont du General de la Motte Rouge. * Mirabeau bridge in Paris (road bridge, 93 m range)* Alexandre-III Bridge (Paris) (highway bridge, 107 m range)* Bercy bridge (Paris)* Gateway Debilly (Paris)* Bridge of Notre-Dame (Paris)The bold steel arches of the Pont Général-de-la-Motte-Rouge (1885) in Nantes, Pont Mirabeau (1896) in Paris, Pont de l'Université (1899), Pont Alexandre III (1900) and Pont Notre-Dame (1914) in Paris set standards for steel bridges. All those bridges listed could only be built as a result of Résal’s research into elasticity and the strength of structural steels, work that he summarised in a monograph (1892). Furthermore, Résal made a lasting contribution to earth pressure theory (1903, 1910), which Albert Caquot would use successfully as his starting point.The Résal effect is named after him.
Works *''Ponts métalliques'', 2 Volumes 1885,   Online*With Ernest Degrand: ''Ponts en maçonnerie'', 2 Volumes, 1887,   Volume 1 Online  Volume 2 Online*''Constructions métalliques, élasticité et résistance des matériaux, fonte, fer et acier'', 1892,  Online*''Résistance des matériaux. Cours de l'École des ponts et chaussées'', 1892; 1922,  Online*mit Amédée Alby: ''Notes sur la construction du pont Alexandre III'', 1899*''Stabilité des constructions. Cours de l'École des ponts et chaussées'', 1901,   Online*''Poussée des terres, stabilité des murs de soutènement'', 1903,   Online*''Cours de ponts métalliques professé à l'École nationale des ponts et chaussées. Ponts en arcs et ponts suspendus'', 3 Bände, 1912–1922,  Online
Achievements Image:pont_mirabeau_paris_close_up.jpg|Mirabeau bridgeImage:Pont_de_Bercy.jpg|Bercy bridgeImage:France_Paris_Pont_Notre_Dame_01.JPG|Bridge of Notre-Dame
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