Special Feature*
Earthquake simulator shakes buildings as tall as six stories
E-Defense
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Top: This concrete slab is used to simulate an earthquake. Height 5 m, width 15 m, length 20 m. It can support test buildings up to 1,200 tons in weight and six stories high. Twenty-five huge hydraulic vibrators (bottom) simulate seismic motion in three dimensions: vertically, side-to-side, and back-and-forth.
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The 3D Full-Scale Earthquake Testing Facility (called E-Defense for short) was completed in April 2005, a decade after the Great Hanshin Awaji Earthquake flattened parts of the Kobe region. The new facility is located in Miki, Hyogo Prefecture, not far from Kobe, and was constructed by the National Research Institute for Earth Science and Disaster Prevention. It has a concrete slab that simulates strong jolts and can shake buildings as tall as six stories.
The earthquake that rocked the Kobe region collapsed many buildings, killing thousands of people. E-Defense was developed in the hope that it would help prevent more deaths after such a disaster. The concrete slab shakes actual-size test buildings and monitors the processes leading to their weakening and collapsing. The tests provide information that will be used to design quake-resistant buildings and test those designs.
The large concrete slab simulates earthquakes as severe as the magnitude-7 one that rocked the Kobe region in 1995, and produces three-dimensional movements — vertical, side-to-side, and back-and forth — that cause the building to collapse.
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