The land rolls like waves as it liquefies beneath the viaduct. As spliced timber piles underpinning the columns lose lateral support, the piles buckle and some viaduct columns drop swiftly out of sight. Utilities rupture, fires break out and roadway decks collapse with shocking speed. Related Links: Simulated Quake Rattles Populace Is it a scene from a new disaster movie? No. It’s a simulation of an engineering model-driven video showing what would happen to the Seattle’s Alaskan Way Viaduct in the case of a serious earthquake. A political storm set off by the Washington State Dept. of Transportation’s release of
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.