Abstract
In recent years, increasing research efforts have been geared towards studying the repair and strengthening of concrete structures using fibre reinforced polymer (FRP) composites. Numerous studies have shown that structural members such as circular columns can experience a significant increase in strength and ductility due to passive confinement provided by the composite wraps. In rectangular columns, however, limited strength increases have been achieved due to the nonuniform distribution of confining stress around the column. Despite the large number of studies on FRP-confined concrete columns, studies on the strengthening of RC wall-like (i.e. high aspect ratio) columns have been limited. Furthermore, most studies did not consider the effect of sustained loading on the column during repair/strengthening. This paper reports the results of an experimental investigation where various schemes have been used to strengthen wall-like RC columns with and without sustained loading. The effects of sustained loading on the strengthening efficiency as well as the lateral strain distribution in the composite wrap have also been investigated.
Résumé
De nombreux travaux ont été développés ces dernières années dans le but de renforcer et réparer les structures en béton armé utilisant des feuilles de polymère renforcées de fibres de carbone ou de verre (FRP). Plusieurs études ont montré que les colonnes circulaires ont subi une augmentation appréciable de la capacité ultime et la ductilité en raison du confinement passif engendré par les feuilles composites. Cependant, dans les colonnes rectangulaires, l'augmentation de la capacité ultime des membres a été limitée à cause de la distribution non uniforme de la contrainte du confinement autour de la colonne. Malgré les nombreuses études sur les colonnes en béton armé utilisant des FRP, les essais sur les colonnes rectangulaires sont limités. En outre, la plupart des études faites n'ont pas pris en considération l'effet de la charge soutenue par la colonne pendant la réparation ou le renforcement. Cet article rapporte les résultats d'une étude expérimentale où plusieurs méthodes ont été utilisées pour renforcer des colonnes en béton armé à section rectangulaire avec et sans chargement soutenu. Les effets de la charge soutenue sur l'efficacité de renforcement ainsi que les distributions des tensions latérales dans les feuilles composites ont aussi été étudiés.
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Tanwongsval, S., Maalej, M. & Paramasivam, P. Strengthening of RC wall-like columns with FRP under sustained loading. Mat. Struct. 36, 282–290 (2003). https://doi.org/10.1007/BF02480867
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DOI: https://doi.org/10.1007/BF02480867