SEINUK Ysrael A. Seinuk, a structural engineer who pioneered innovative design techniques for tall buildings in New York City and around the world for more than 50 years, and who led two design firms, died on Sept. 14 in New York City at age 78. The cause was cancer, says a spokeswoman for Ysrael A. Seinuk PC, the New York City-based firm of which he was CEO. Seinuk devised innovative high-rise engineering approaches, including New York�s first use of seismic isolators and a frame for a slim structure that eliminated transfer girders. He was named an ENR Marksman in 1983
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.