The Council on Tall Buildings & Urban Habitat is vigorously advancing its mission—to help upgrade skyscraper production by offering better design tools and standardizing practice worldwide. In a fundamental shift, the 42-year-old CTBUH is engaging in research, including a $2-million fire study that will culminate in a real building burn.Next year, CTBUH plans to publish five design guidelines on wind-tunnel testing, structural outriggers, performance-based seismic design, column shortening, foundations and natural ventilation. “There is a need for better tall buildings around the world,” said Antony Wood, CTBUH's executive director, at the CTBUH 2011 World Conference in Seoul. The Oct. 10-12
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.