In the aftermath of Tuesday's 5.8-magnitude earthquake in Virginia, building owners in the Washington, D.C., region are accessing potential damage to buildings. Other industry voices are questioning whether the temblor, the largest Virginia has experienced on record, will lead to new discussions of Seismic codes for the East Coast.Several major facilities are closed while teams of engineers inspect structures. Most notably, the National Parks Service closed the Washington Monument indefinitely after teams discovered cracks near the top of the 555-ft-tall obelisk, considered the world's tallest of its kind. Other closed facilities include the National Building Museum, the Dept. of Homeland
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.