Engineers shake tallest steel-framed building ever tested on an earthquake simulator

The tallest steel-framed building ever tested on an earthquake simulator started moving slowly, swaying and twisting. The 10-story, 100-foot structure was experiencing simulations of real earthquakes, including the 6.9 magnitude, 1989 Loma Prieta temblor, as part of an effort to determine if height limits for buildings made of cold-formed steel could be increased.