Effect of thin fiber-concrete jacketing on the resilience of damaged RC columns

Rachid Labdaoui; Abdenour Toukal; Mohammed Kadri

doi:10.7764/RDLC.24.3.706

Authors

Rachid Labdaoui Research unit UR-MPE: Materials-Processes and Environment, University of M’Hamed Bougara of Boumerdes, Boumerdes (Algeria)
Abdenour Toukal Research unit UR-MPE: Materials-Processes and Environment, University of M’Hamed Bougara of Boumerdes, Boumerdes (Algeria)
Mohammed Kadri Research unit UR-MPE: Materials-Processes and Environment, University of M’Hamed Bougara of Boumerdes, Boumerdes (Algeria)

DOI:

https://doi.org/10.7764/RDLC.24.3.706

Keywords:

RC columns, cyclic loading, jacketing, steel fiber, polypropylene fiber, damage index.

Abstract

This study investigates the behavior of reinforced concrete (RC) columns strengthened with RC jacketing under cyclic loading. Three full-scale specimens were tested, three of which were subjected to a constant vertical force and an alternating cyclic horizontal force until failure. The specimens were strengthened using three types of concrete: ordinary concrete (OC), steel fiber concrete (SFC), and polypropylene fiber concrete (PPFC). The bearing capacity, ductility, and failure mode of the columns were analyzed and compared. By using high-strength concrete, the thickness of the jacketing was reduced to 50 mm, which limits the negative effects of increased sections on the seismic response of the columns. The results show that the use of steel and polypropylene fibers improves the bearing capacity, delays the appearance and propagation of cracks, and extends the time to failure. This study provides valuable insights into the performance of RC columns under cyclic loading and the effectiveness of RC jacketing for their strengthening.

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