Two days after the Sept. 11, 2001, terrorist attacks on the World Trade Center, structural engineer Irwin G. Cantor—guided by steel erector Bobby Stuart—walked up a darkened staircase to the 18th floor of a World Financial Center tower near Ground Zero, which his office had engineered in the 1980s.
As construction in New York City continues to flourish, site safety is a growing concern. With this in mind, Regan Branch and Paul Charlton have launched an online subscription service created to connect contractors and developers with construction site safety professionals throughout the city.
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.