Semi-active Control Design For Base Isolated
Structures With Switching Damping Coefficient
Of Oil Dampers
Author(s)
A. Fukukita & M. Takahashi
Abstract
In Japan, after the Hyogo-ken Nambu Earthquake in 1995, base-isolated
structures spread rapidly. Now, there are about 2,800 base-isolated buildings
(apartment complexes account for 45% and hospitals for 12%) and about 4,300
base-isolated houses in Japan. Base-isolation technology was effective in the
Tohoku Earthquake 2011, off the Pacific coast. This paper presents the methods
behind semi-active control design for base-isolated structures with oil dampers
whose damping coefficient can be set in two levels: applying two different
damping coefficients based on the proposed control design. The damping
coefficients of the oil dampers are different to each other. The control objective
is the reduction of both the displacement of a base-isolated layer and absolute
acceleration of a base-isolated building, which are trade-offs against each other.
The layered neural network with the Genetic Algorithm (GA) is applied to the
semi-active control design. Absolute acceleration of the building and
displacement of the isolated layer are the input signals of the neural network, and
the switching parameter for the damping coefficient is the output signal of the
neural network. The GA is used to adjust the neural network parameters that
decide the control performance. The target of the control design is specified to
permit the displacement of the base-isolated layer to the upper limit and to
restrain the increase of building acceleration. We study the control performance
of the proposed control method using several kinds of earthquake motions in the
computer simulation.
Keywords: semi-active control, base isolation, neural network, genetic
algorithm, variable oil damper.
Keywords
semi-active control, base isolation, neural network, geneticalgorithm, variable oil damper
Related Book
Other papers in this volume
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