CHICAGO -- There were some anxious moments for construction workers as a giant helicopter lowered an 11-ton cupola frame onto the top of a 41-story downtown skyscraper. The installation Sunday atop ...
Cold-formed steel portal frames have emerged as a versatile and efficient structural system in modern construction. Their design exploits thin-walled steel sections, which are cold-formed to yield ...
One of Bertrand Goldberg’s twin Marina City towers being built in Chicago. When completed in 1968, the towers were the tallest reinforced concrete structures in the world. (Courtesy Geoffrey Goldberg) ...
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