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Seismic response of triple friction pendulum bearing under multi hazard level excitations

Seismic response of triple friction pendulum bearing under multi hazard level excitations Triple friction pendulum (TFP) bearing is a new generation sliding isolation system having multiple spherical sliding surfaces. The friction isolation system with single sliding surface is designed for a specific level of ground shaking, which may prove ineffective in case of other hazard levels. The TFP bearing on the other hand, exhibits adaptive behaviour and imparts greater amount of flexibility to the designer for various levels of earthquake shaking. Herein seismic response of TFP bearing is studied under 60 records comprising of service level, design basis and maximum considered earthquakes. Two types of surfaces having low and high friction in combination with three different displacement capacities of the bearing, resulting in six isolator design are considered. It is shown that although being a passive device, the TFP bearing stiffens at low input shaking, softens with increasing input reaching a minimum at the DBE, and then stiffens again at higher levels of input and thereby shows adaptive behaviour. Further, the increase of displacement capacity of bearing influences the response under MCE event, however, for DBE and SLE no significant change in demand is observed. Keywords: triple friction pendulum system; adaptive behaviour; multi hazard level; seismic performance; MDOF system. Reference http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Engineering Inderscience Publishers

Seismic response of triple friction pendulum bearing under multi hazard level excitations

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Publisher
Inderscience Publishers
Copyright
Copyright © 2016 Inderscience Enterprises Ltd.
ISSN
1758-7328
eISSN
1758-7336
DOI
10.1504/IJSTRUCTE.2016.079288
Publisher site
See Article on Publisher Site

Abstract

Triple friction pendulum (TFP) bearing is a new generation sliding isolation system having multiple spherical sliding surfaces. The friction isolation system with single sliding surface is designed for a specific level of ground shaking, which may prove ineffective in case of other hazard levels. The TFP bearing on the other hand, exhibits adaptive behaviour and imparts greater amount of flexibility to the designer for various levels of earthquake shaking. Herein seismic response of TFP bearing is studied under 60 records comprising of service level, design basis and maximum considered earthquakes. Two types of surfaces having low and high friction in combination with three different displacement capacities of the bearing, resulting in six isolator design are considered. It is shown that although being a passive device, the TFP bearing stiffens at low input shaking, softens with increasing input reaching a minimum at the DBE, and then stiffens again at higher levels of input and thereby shows adaptive behaviour. Further, the increase of displacement capacity of bearing influences the response under MCE event, however, for DBE and SLE no significant change in demand is observed. Keywords: triple friction pendulum system; adaptive behaviour; multi hazard level; seismic performance; MDOF system. Reference

Journal

International Journal of Structural Engineering – Inderscience Publishers

Published: Jan 1, 2016

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