Robust hybrid isolation system for a seismically excited cable-stayed bridge

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This paper presents a robust hybrid isolation system for seismic response control of a cable-stayed bridge. Because multiple control devices are operating, a hybrid control system could alleviate some of the restrictions and limitations that exist when each control system, such as passive, active, semiactive control system, is acting alone. However, the overall system robustness may be negatively impacted by active control part of the hybrid system or active controller may cause instability due to small margins. Therefore, control algorithms that guarantee the controller robustness should be considered to improve the overall system robustness of the hybrid seismic isolation system and to enhance the possibility of real applications of the system consequently. In this study, a hybrid isolation system combining lead rubber bearings and hydraulic actuators is used for seismic response control of a cable-stayed bridge. Lead rubber bearings are used as passive control devices to reduce the earthquake-induced forces in the bridge and hydraulic actuators are used as active control devices to further reduce the bridge responses, especially deck displacements. Furthermore, two kinds of robust control algorithms, i.e., the H-2 and H-infinity control designs with frequency weighting filters, are used to improve the controller robustness of the overall system. The numerical simulation results show that the proposed hybrid seismic isolation systems have the excellent robustness for stiffness perturbations without loss of control performances under the considered earthquakes in this study. Therefore, the proposed robust hybrid isolation systems could effectively be used to seismically excited cable-stayed bridges.
Publisher
Taylor & Francis Ltd
Issue Date
2005-07
Language
English
Article Type
Article
Keywords

BASE-ISOLATION SYSTEMS; PROTECTION

Citation

JOURNAL OF EARTHQUAKE ENGINEERING, v.9, no.4, pp.497 - 524

ISSN
1363-2469
URI
http://hdl.handle.net/10203/89433
Appears in Collection
CE-Journal Papers(저널논문)
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