Photo: Nick Merrick/Hedrich Blessing The latest addition to the Raleigh-Durham International Airport (RDU) opened on Jan. 24 sporting a unique look that uses laminated Douglas-fir trusses. The project’s designer, Denver-based Fentress Architects, claims RDU is the first major airport in the world to use a “lenticular wood-truss structure” to support a roof. In all, 80 trusses span the entire length of the terminal and concourse at 30 ft intervals. The trusses are 90 ft long and weigh 34 tons each. The latest phase of the terminal’s construction adds 920,000 sq ft to the 550,000 sq ft that opened in 2008,
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.