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For performance demonstration
of
Earthquake Protector (EP) as a seismic
base isolator, see EP-2004-1,
EP-2005
or EP-2006.
It is obvious, EP transfers upward considerably reduced shearing forces
at strong earthquakes. EP, invented by Valentin Shustov, has been
supported by NSF, Award No CMMI-0618183.
To probe the concept experimentally,
some scaled-down but kinematically similar to their prototypes building
models with and without eccentric loads on the roof level were mounted
on EP and tested on a shake table, as well as the models engaging so called
Prestressing-Induced
Frame System (PIFS) rigidly connected to a base plate (see, e.g.,
EP-2004-2).
Each building model is a PIFS, i.e. an assembly of prefabricated columns
and floor slabs tightened together by post-tensioning with the help of
external tendons. The time-histories used for the testing had peak accelerations
up to 1.0g - 30.6g. |
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