Perfecting Structure: From X-Braced Steel to Concrete and Back
In 1968, as workers hoisted steel beams more than 1,100 feet above Chicago’s lakeshore, the John Hancock Center (now 875 N Michigan Avenue) reached its full height. The achievement would forever change not only Chicago’s skyline, but the entire field of tall building design and engineering. Hancock’s “braced tube” structural system—devised by SOM engineer Fazlur … Continued