Abstract
Old steel arch bridges commonly need rehabilitation interventions because of their insufficient lateral resisting capacity against seismic loads. A localized strengthening method is not always applicable to such bridges because of high costs and the lack of convenient access to the structural members, and replacement of the existing arch supports with base isolators is extremely difficult and risky. As an alternative and convenient retrofitting method, energy dissipation systems in the form of nonlinear viscous dampers (NVDs) can be adopted. This study analyzed NVDs localized within the end bracing members of a steel arch bridge (Qotour Bridge, Iran) as a case study. Because the selection of NVD properties and the optimal location of the NVDs require several extremely time-consuming nonlinear analyses, a design strategy was outlined using linearization of the structural system. The linearization was performed by developing novel concepts of equivalent damping ratio and damping correction factor for the structure rehabilitated with localized NVDs, and the proposed design strategy was applied to the real steel arch bridge. The complimentary nonlinear analyses (nonlinear time-history and pushover analyses) conducted showed that the proposed design method is reasonably accurate in the prediction of the maximum response of the rehabilitated bridge. Moreover, the results showed that by using the proposed linearization method, the NVD characteristics can be adjusted suitably so that the seismic demand on the existing members and connections remains below an allowable limit, and the nonlinear deformations and energy dissipation are localized mostly in the NVDs.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request: MATLAB code version R2018a for the analyses, and finite-element code of the bridge.
Acknowledgments
All the analyses were performed using the facilities provided by the High-Performance Computing Centre (HPCC) of Tafresh University. The kind collaboration of the head of HPCC is hereby acknowledged. All the information about the Qotour Bridge was provided by the Iranian Railway Administration of Tracks and Technical Structures and by Mr. Rahbar, the managing director of Permayon. Their support is gratefully appreciated.
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Published In
Practice Periodical on Structural Design and Construction
Volume 26 • Issue 3 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 29, 2020
Accepted: Dec 29, 2020
Published online: Mar 16, 2021
Published in print: Aug 1, 2021
Discussion open until: Aug 16, 2021
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