Novel semi-active magnetorheological seismic isolators that may be used in buildings and bridges to minimize structural damage during an earthquake.
Researchers at the University of California, Irvine have developed a novel semi-active magnetorheological seismic isolator. This new isolator is composed of magnetorheological nanocomposites embedded between two steel plates. The magnetorheological nanocomposites incorporate multi-walled carbon nanotubes which enhances the performance of the isolator. Two steel yokes support two coils which may be controlled to generate a magnetic field to change the stiffness of the magnetorheological nanocomposites. During an earthquake, sensors activate the semi-active isolators to adjust their stiffness to isolate the building or bridge in which they are embedded.
These novel isolators may be used to reduce seismic damage in buildings and/or bridges.
Unlike passive isolators, semi-active isolators have shown to use less energy and may be powered by batteries. Traditional semi-active isolators utilize fluids and they take up more space.
|United States Of America||Issued Patent||9,581,214||02/28/2017||2013-923|
A prototype has been made and its dynamic mechanical behavior has been characterized.