Floating ladder track and new viaduct structures to provide low-vibration and superior running safety during earthquake

The frame-type viaducts combined with concrete track-bed has been popularly used in Japan. It suffered, however, severe damages in the Hyogo-ken Nanbu Earthquake in 1995. This frame-type viaduct needs thick and wide concrete track-bed to support ballasted tracks and is consequently becoming a top-heavy and low natural frequency structure. Then...