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Comparison of different models for high damping rubber bearings in seismically isolated bridges

Tubaldi, E, Mitoulis, Stergios and Ahmadi, H (2017) Comparison of different models for high damping rubber bearings in seismically isolated bridges Soil Dynamics and Earthquake Engineering, 104. pp. 329-345.

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Abstract

Steel-reinforced high damping natural rubber (HDNR) bearings are widely employed in seismic isolation applications to protect structures from earthquake excitations. In multi-span simply supported bridges, the HDNR bearings are typically placed in two lines of support, eccentric with respect to the pier axis. This configuration induces a coupled horizontal-vertical response of the bearings, mainly due to the rotation of the pier caps. Although simplified and computationally efficient models are available, which neglect the coupling between the horizontal and vertical response, their accuracy has not been investigated to date. In this paper, the dynamic behaviour and seismic response of a benchmark three-span bridge are analysed by using an advanced HDNR bearing model recently developed and capable of accounting for the coupled horizontal and vertical responses, as well as for significant features of the hysteretic shear response of these isolation devices. The results of the analyses shed light on the importance of the bearing vertical stiffness and how it modifies the seismic performance of isolated bridges. Successively, the seismic response estimates obtained by using simplified bearing models, whose use is well established and also suggested by design codes, are compared against the corresponding estimates obtained by using the advanced bearing model, to evaluate their accuracy for the current design practice.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Tubaldi, E
Mitoulis, Stergioss.mitoulis@surrey.ac.uk
Ahmadi, H
Date : 11 November 2017
DOI : 10.1016/j.soildyn.2017.09.017
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Melanie Hughes
Date Deposited : 25 Sep 2018 12:57
Last Modified : 17 Oct 2019 10:47
URI: http://epubs.surrey.ac.uk/id/eprint/849429

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