Earthquake Response Control of Isolated Bridges Using Supplementary Passive Dampers

authored by

Niharika Talyan, Said Elias, Vasant Matsagar

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.

External Organisation(s)

University of Iceland

Type

Article

Journal

Practice Periodical on Structural Design and Construction

Volume

26

Publication date

05.2021

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Arts and Humanities (miscellaneous), Building and Construction, Civil and Structural Engineering

Electronic version(s)

https://doi.org/10.1061/(asce)sc.1943-5576.0000563 (Access: Closed)