Innovative EC8-compliant solutions for selection of the optimum retrofitting scheme of buildings with special characteristics

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes

External organisations

  • Institute of Engineering Seismology and Earthquake Engineering (ITSAK)
  • University of Patras


This article presents the seismic assessment and retrofit design of an existing old building in Greece of great regional importance. The Building is the “Administration building of Kalamata” located in the city of Kalamata, capital of the Messinia Prefecture. The Building, the largest in the city, is a seven-floor reinforced concrete (r/c) structure with a basement built in 1974. The seismic assessment procedure is based on the provisions of the EN 1998-3 code and the Greek code for structural interventions “KAN.EPE.,” introducing several novelties that give solutions to difficult practical problems with respect to the modeling, the analysis methods, and performance evaluation framework. The article presents details of the Building’s modeling, description of the analyses, and the corresponding results, as well as the most efficient retrofitting schemes that fulfill the safety demands (i.e. performance level B or “Life safety” and performance level C or “Collapse prevention” according to KAN.EPE.), considering cost and minimal disturbance both for the superstructure and foundation interventions. While considering the various intervention solutions, it proceeds with new simplified ways that optimize the proposed solution. As such, it can be used as a paradigm for finding clever, practical, and at the same time economical solutions. An interesting characteristic of the Building is that it has been strengthened already after the damaging earthquake of 1986, but the new usage requirements raised questions about the adequacy of that earlier strengthening. Last, but not least, it must be mentioned that this building is unique in the sense that the main earthquake record (a strong motion accelerogram) obtained during the damaging 1986 Kalamata earthquake was at its basement. This record is also used for the assessment.

Bibliographic note

Funding Information: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study was funded by the prefecture of Messinia in Greece and was carried out under the guidance and supervision of the last author. Publisher Copyright: © The Author(s) 2021.


Original languageEnglish
JournalEarthquake Spectra
Early online date24 Jun 2021
Publication statusE-pub ahead of print - 24 Jun 2021


  • chord rotation, Existing old r/c buildings, nonlinear analysis, r/c jackets and walls, seismic assessment, seismic retrofit

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