Displacement response control of seismic-excited nonlinear isolated bridges

T. Y. Lee, K. Kawashima

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The effectiveness of seismic displacement response control for isolated bridges, which exhibit nonlinearity at both the columns and the isolators, is studied using the LQR optimal active control. A typical viaduct is analyzed for evaluation. A parametric study of weighting matrices is carried out to examine the effect on reducing the deck displacement response. The results indicate that the LQR active control is effective in reducing the deck displacement at small control force levels. However, the larger control force is not beneficial to reduce the deck displacement because it causes large column post-yielding displacement. The effectiveness of saturation of control force is thus investigated for preventing excessive control at large control force levels. Finally, the active control is compared with the passive control using viscous dampers.

Original languageEnglish
Title of host publication8th US National Conference on Earthquake Engineering 2006
Pages5121-5130
Number of pages10
StatePublished - 2006
Event8th US National Conference on Earthquake Engineering 2006 - San Francisco, CA, United States
Duration: 18 Apr 200622 Apr 2006

Publication series

Name8th US National Conference on Earthquake Engineering 2006
Volume9

Conference

Conference8th US National Conference on Earthquake Engineering 2006
Country/TerritoryUnited States
CitySan Francisco, CA
Period18/04/0622/04/06

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