Earthquake Protector: Shake Table Crash Testing

Comparative earthquake engineering experiments with 12-story building models: the right one is resting on a new type of seismic base isolation called "earthquake protectors", the left one is fixed to the base. The fundamental natural period of superstructures equals 1.2s, the isolated period of Earthquake Protector equals 5.0s, the range of earthquake simulation periods is 0.02 - 2.00s. It is obvious: application of Earthquake Protector can raise a building's seismic sustainability dramatically. Visit also http://en.wikipedia.org/wiki/Base_iso... and http://en.wikipedia.org/wiki/Earthqua... .

For virtual re-creation of this testing, use EPETO or Earthquake Performance Evaluation Tool Online at http://www.seismicevaluation.org. You may also choose to download the corresponding software called EPET or Earthquake Performance Evaluation Tool from http://www.epet.space3d.biz

• Category

  Science & Technology

[vshustov]

The model put on base isolators was composed of two 6-story ones. As a result, in the middle, we obtained a double thick deck which, by adding some weight, may be considered slightly detrimental. On the other hand, the upper portion of the isolated model was previously exposed to a severe shaking and inherited considerable structural degradation. Therefore, we rectified it by adding non-structural fasteners (not columns!).

[vshustov]

The model put on base isolators was composed of two 6-story ones. As a result, in the middle, we obtained a double thick deck which, by adding some weight, may be considered slightly detrimental. On the other hand, the upper portion of the isolated model was previously exposed to a severe shaking and inherited considerable structural degradation. Therefore, we rectified it by adding non-structural fasteners (not columns!).

[vshustov]

ABC

[vshustov]

Publish your tool so that others can see it on nees.org

[vshustov]

You are right, LonleyDeath1423. This is one of the basic pillars of base isolation.

[stevehawking]

great!

notice how the taller building only gets moving when the smaller one collapses on it!

[vshustov]

this is the very idea of earthquake protector!

[tinwax]

use some grey matter if you have any

[iulianastefan]

interesting how the base isolated system has an increased mass at half the height (or so it seems) and some columns added to the upper stories...that increase their overall stiffness...that should act as a mass damper or so it seems to me?

[andreimurariu]

That is one of the reasons for using base isolation. The natural vibration period of the structure is increased, so that it doesn't "resonate" with the earthquake motion. (if you are interested, check out acceleration response spectrum)

[Lord Cthulhu]

The only reason the first one fell is because the frequency resonated with it's own. The second one didn't because it was higher, therefor the frequency was altered.

[minillagodzilla2004]

wiggly jiggly