…the great airship hangars at Orly constructed by the French engineer Eugène Freyssinet in 1916; they were made with 9-centimeter- (3.5-inch-) thick corrugated parabolic vaults spanning 80 meters (266 feet) and pierced by windows. In the 1920s Freyssinet made a major contribution to concrete technology with the introduction of pretensioning.…
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