Related Links: San Francisco Skyscraper Lifts Stature of Seismic Design Performance Design Floodgates Open on the West Coast Strong Motion Center Scientists say there is a 63% probability of a damaging earthquake in the Bay Area in the next 30 years. Officials in quake-prone California recently took a step toward making the best of the Big One, when it does hit, by installing the densest array of accelerometers in any U.S. skyscraper to date. The 72 sensors, activated recently in the tallest tower in the U.S. built using performance-based seismic design, are expected to yield valuable data about the behavior
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.