Skip to main content

Research Repository

Advanced Search

Design and assessment spectra for retrofitting of RC buildings

Thermou, Georgia E.; Elnashai, Amr S.; Pantazopoulou, Stavroula J.


Profile Image

Assistant Professor in Structural Engineering

Amr S. Elnashai

Stavroula J. Pantazopoulou



This article presents a novel approach for deriving Retrofit Design Spectra (RDS) that are intended for use in preliminary development and assessment of seismic upgrading scenarios of existing structures. The new spectral representation relates the characteristics of the intervention method chosen as the core of the upgrading strategy, with the ductility and strength demand of the retrofitted structure. The methodology utilized for the derivation of the RDS is based on the Capacity Spectrum Method where the capacity curve is described by relationships for global and local intervention methods that are parameterized in terms of fundamental response quantities. The proposed spectra provide direct insight into the complex interrelation between the characteristics of the intervention method and the implications of the upgrading scenario on demand. Alternative retrofit solutions are thus assessed in an efficient way. A case study is used to illustrate practical application of the new approach.


Thermou, G. E., Elnashai, A. S., & Pantazopoulou, S. J. (2010). Design and assessment spectra for retrofitting of RC buildings. Journal of Earthquake Engineering, 14(5), 743-770. doi:10.1080/13632460903410764

Journal Article Type Article
Acceptance Date Oct 13, 2009
Online Publication Date May 17, 2010
Publication Date May 20, 2010
Deposit Date Dec 10, 2018
Publicly Available Date Jan 22, 2019
Journal Journal of Earthquake Engineering
Print ISSN 1363-2469
Electronic ISSN 1559-808X
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 14
Issue 5
Pages 743-770
Keywords Retrofitting; Strengthening; Seismic Upgrading; Rehabilitation; RC Jacketing; FRP Jacketing; Substandard Construction; Spectra
Public URL
Publisher URL