After years of chugging along, the development of the nation's first consensus-based standard for the use of building information modeling is finally picking up steam. The buildingSMART alliance, which is releasing the National BIM Standard-United States, or NBIMS-US, says a version of the standard will be out by year's end. Beginning on Aug. 3, the 30-day public-comment period will broach the 45 topics that form the core of the standard.“We're out of the back room,” says Deke Smith, executive director of the alliance, which is a council of the National Institute of Building Sciences, Washington, D.C.Smith and his colleagues have
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.