The Millau viaduct : behind the feat, a number of brilliant innovations
The technique of cable-stayed bridges goes back to the 18th century. But various accidents, usually the breaking of cables following wind-generated oscillations, put this technique in quarantine until the 1960s. A video to watch once again shows it: the collapse of the Tahoma Bridge in the United States in 1940. A few pictures available on http://thefilmvault.com/disasters/tahoma_bridge.html.
The Millau viaduct, opened yesterday, has been praised for a few feats. The height of its pillars for a start ; pillar #3 with 221 meters and pillar #2 with 245 meters (343 meters if you add the pylon holding the cables) shatter the previous record for the category (180 meters). The span between pillars is also remarkable : with 340 meters, the previous record (140 meters) for a metallic bridge almost looks short. But much interest lies in the various innovations generated during this exceptional roadwork.