An experimental study of active base isolation control for seismic protection

Chia Ming Chang, B F Spencer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Structural control technology has been widely accepted for the protection of structures against seismic hazards. Passive base isolation is one of structural control techniques that can be employed to enhance the performance of structures subjected to severe earthquake excitations. Isolation bearings employed at the base of structures naturally increase the structural flexibility, but concurrently result in large base displacements. The combination of base isolation with active control, i.e., an active base isolation, creates the possibility to achieve a balanced level of control performance in reductions of either floor accelerations or base displacements. Many theoretical papers have been written by researchers, on active base isolation for buildings and some experiments have been conducted for unidirectional excitations. However, earthquakes are intrinsically multi-dimensional, resulting in out of plane responses, including torsion responses of the structures. Hence, the focus of this paper is the development and experimental verification of active base isolation for buildings subjected to bi-directional seismic excitations. First, solutions to this control-orientated problem are given by a series of procedures in system identification using the proposed system identification procedure, control designs with considerations of realization based on the H2/LQG control algorithm, and methods to evaluate this control performance. Designed controllers for achieving balanced performance are validated on a six degree-of-freedom shake table in the Smart Structures Technology Laboratory at the University of Illinois at Urbana-Champaign.

Original languageEnglish (US)
Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010
DOIs
StatePublished - Jun 18 2010
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010 - San Diego, CA, United States
Duration: Mar 8 2010Mar 11 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7647
ISSN (Print)0277-786X

Other

OtherSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010
CountryUnited States
CitySan Diego, CA
Period3/8/103/11/10

Keywords

  • Active base isolation
  • Bi-directional seismic excitation
  • Control-structure interaction
  • H/LQG control algorithm
  • Structural control
  • System identification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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