eVideo
Kanopy
Epic Engineering Failures and the Lessons They Teach
Summary
Boston's John Hancock Tower was still under construction when winds of 75 miles per hour struck on January 20, 1973. By morning, 65 exterior glass panels lay shattered on the ground. Around that time, construction workers reported severe swaying of the structure during winds. Discover how tuned-mass damper technology became an effective tool for controlling wind- and earthquake-induced sway.