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Strengthening of historic masonry structures with composite materials

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Abstract

This paper deals with the applications of unidirectional fibre-reinforced polymer tendons for the reversible strengthening of masonry monuments. The tendons, anchored to the masonry only at the ends, are circumferentially applied on the external face of the structure and posttensioned to provide horizontal confinement. The relevant properties of fibre-reinforced polymer materials and prestressing systems are summarised; in addition, the concepts for their application, including anchorage, to masonry structures are developed, and a general design procedure is presented. The effectiveness of the strengthening technique is established both analytically, for structures with simple geometries, and numerically, for a real three-dimensional structure with openings, based on the finite element method. The effects of temperature changes on the tendons and the masonry are shown to be negligible. It is concluded that the effectiveness of the proposed method in the consolidation of historic masonry structures is quite satisfactory, especially when the strengthening elements are made of carbon fibre-reinforced polymer.

Résumé

Cet article présente l’utilisation de câbles unidirectionnels en polymère renforcé de fibres pour le renforcement réversible des monuments en maçonnerie. Les câbles, ancrés dans la maçonnerie uniquement aux extrémités, sont appliqués de manière circonférentielle sur la face externe de la structure et précontraints pour fournir un confinement horizontal. On résume les propriété des matériaux polymères renforcés de fibres et les systèmes de précontrainte. Les concepts pour leur application, y compris l’ancrage, aux constructions en maçonnerie sont discutés, et une procédure générale de conception est présentée. L’efficacité de la technique de renforcement est établie à la fois analytiquement, pour des constructions à gémétrie simple, et numériquement, pour de véritables constructions à trois dimensions ayant des ouvertures, sur la base de la méthode des éléments finis. Il est montré que les effets des variations de température sur les câbles et sur la maçonnerie sont négligeables. On conclut que l’efficacité de la méthode proposée pour la consolidation des constructions historiques en maçonnerie est tout à fait satisfaisante, surtout lorsque les éléments de renforcement sont constitués de polymère renforcé de fibres en carbone.

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Authors and Affiliations

  1. Dept. of Civil Engineering, University of Patras, 26500, Patras, Greece

    Thanasis C. Triantafillou & Michael N. Fardis

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  1. Thanasis C. Triantafillou
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  2. Michael N. Fardis
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Editorial note Prof. Thanasis Triantafilou is a RILEM Senior Member.

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Triantafillou, T.C., Fardis, M.N. Strengthening of historic masonry structures with composite materials. Mat. Struct. 30, 486–496 (1997). https://doi.org/10.1007/BF02524777

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