Earthquake Response Control of Isolated Bridges Using Supplementary Passive Dampers
Publication: Practice Periodical on Structural Design and Construction
Volume 26, Issue 2
Abstract
Earthquake response control of base-isolated bridges using supplementary passive dampers is presented. A benchmark highway overcrossing located in California is selected to indicate the effectiveness of such hybrid response control schemes. The bridge is modeled as a lumped mass three-dimensional stick model. The coupled differential equations of motion for the system are derived and solved using Newmark’s step-by-step iteration method. Considering a bidirectional interaction of the seismic forces, the bridge responses are investigated using various combinations of base isolators and damper systems, called hybrid systems. Further, a parametric study is carried out to investigate the dynamic response of the highway bridge by changing the characteristic parameters of the control devices and the isolation period of the structure for different hybrid systems under various real earthquake ground motions. The variations in seismic responses, such as bearing displacement and base shear in the bridge pier, are computed and compared to study the effectiveness of the various damper-isolator combinations. The present study concludes better performance of the fluid viscous damper when used as supplementary dampers with the lead-core rubber bearing or friction pendulum system for the base isolation, leading to reduced bearing displacements and pier base shear.
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Data Availability Statement
Some or all of the data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.
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Practice Periodical on Structural Design and Construction
Volume 26 • Issue 2 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 19, 2020
Accepted: Oct 22, 2020
Published online: Jan 7, 2021
Published in print: May 1, 2021
Discussion open until: Jun 7, 2021
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