Eduardo Torroja y Miret, was a Spanish structural engineer, pioneer in the design of concrete shell structures. His first large project was the Tempul cable-stayed aqueduct in 1926, Guadalete, Jerez de la Frontera, in which he used prestressed girders, and he made his name with the concrete shell-roof at the Algeciras Market Hall. Eduardo Torroja designed thin-shell water tower in Fedala and the roof of hippodrome "Zarzuela" in the form of hyperboloid of revolution. He also used steel with great élan, as at the roof of the Football Stadium, Barcelona. He designed innovative structures in numerous parts of the world, including Morocco and Latin America. His books include Philosophy of Structures and The Structures of Eduardo Torroja. ...more on Wikipedia