Table of Contents
ISRN Civil Engineering
Volume 2011, Article ID 861451, 10 pages
http://dx.doi.org/10.5402/2011/861451
Research Article

Assessment and Code Considerations for the Combined Effect of Seismic Base Isolation and Viscoelastic Dampers

1Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, UK
2Civil Engineering Department, Boğaziçi University, Bebek, Istanbul 34342, Turkey
3Urban Modelling Group, School of Civil, Structural, and Environmental Engineering, University College Dublin, Dublin 4, Ireland

Received 20 June 2011; Accepted 3 August 2011

Academic Editor: D. Huang

Copyright © 2011 Aykut Erkal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To propose an initial formulation for the passive control section of the Turkish Earthquake Code, the impact of base isolation and viscoelastic dampers on a four-storey reinforced concrete (RC) frame building was considered under various one-dimensional quake excitations. Both statically equivalent seismic load methods (comparing Turkish Earthquake code with Uniform Building Code) and linear time history analyses were applied to the RC building based on a portion of the 1999 Kocaeli Earthquake ground motion record (modified to possess predominant spectral periods of 𝑇 1 = 0 . 1 3  sec and 𝑇 2 = 1 . 4 3  sec representing hard and soft soil conditions, resp.). Effective peak ground acceleration was set to 0.40 g. Time history variations of upper column dis-placements and bending moments were compared, as well as storey drift ratios. Reductions of the fixed-base case column bending moments were obtained of up to 73% under base isolation, up to 25% with viscoelastic dampers, and up to 83% (with a unified response reduction factor) when both devices were both present.