Home›Articles›The X-Brace That Used Less Steel Than the Empire State BuildingArticleThe X-Brace That Used Less Steel Than the Empire State BuildingArticlesConnectionsSourcesComments (0)Reader Challenges (0)ConnectionsArticle OnFazlur Rahman Khan, Engineers Well-attested SourcesFazlur Rahman Khan (Wikipedia)Trussed tube and X-bracing sectionQuote, Trussed tube and X-bracing sectionIn contrast to earlier steel frame structures, such as the Empire State Building (1931), which required about 206 kilograms of steel per square meter, and One Chase Manhattan Plaza (1961), which required around 275 kilograms of steel per square meter, the John Hancock Center was far more efficient, requiring only 145 kilograms of steel per square meter.View the SourceAtlas Article Vocabularytier 1AtlasComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.