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Background to the Monolithicity Factors for the Assessment of Jacketed Reinforced Concrete Columns

Thermou, Georgia E.; Kappos, Andreas J.


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Assistant Professor in Structural Engineering

Andreas J. Kappos


The paper presents the background to the expressions adopted in the new Eurocode 8—3 for jacketed reinforced concrete columns. These are based on the commonly adopted concept of monolithicity factors (ratios of resistance of the jacketed section to that of an identical monolithic one). These factors are derived here in two ways: (i) by fitting experimental results for jacketed columns and (ii) by an extended parametric study of substandard reinforced concrete (R/C) members that were retrofitted by adding R/C jackets, analysed using a model developed by the authors that takes into account slip at the interface. Apart from the cross-section geometry and the thickness of the jacket, parameters of the investigation were the material properties of the core cross-section and the jacket, as well as the percentage of longitudinal reinforcement of the jacket and the percentage of dowels placed to connect the existing member to the jacket. It was found that the parameter that had the most visible effect on these factors was the normalised axial load (ν). The finally adopted factors are either simple functions of ν or constant values.


Thermou, G. E., & Kappos, A. J. (2022). Background to the Monolithicity Factors for the Assessment of Jacketed Reinforced Concrete Columns. Buildings, 12(1), Article 55.

Journal Article Type Article
Acceptance Date Jan 1, 2022
Online Publication Date Jan 6, 2022
Publication Date Jan 1, 2022
Deposit Date Mar 21, 2022
Publicly Available Date Mar 22, 2022
Journal Buildings
Electronic ISSN 2075-5309
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 12
Issue 1
Article Number 55
Keywords Building and Construction; Civil and Structural Engineering; Architecture
Public URL
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