Ivan Viest Ivan M. Viest, an immigrant Slovak engineer who pioneered research in composite construction, earthquake resistance and load and resistance factor design (LRFD) of buildings and bridges, died on Feb. 11 in Bethlehem, Pa. He was 89. The cause of death was not released.Viest's research at the University of Illinois in the 1950s led to acceptance of composite design criteria for steel bridges. Research he then championed for the National Academy of Sciences expanded the knowledge of fatigue and fracture and led to advances in LRFD use.Viest added to his body of work while a manager for Bethlehem Steel
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.