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Effects of circular openings on the compressive behaviour of R.C. columns

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Abstract

Core-drilling technique is nowadays always more frequently performed in existing reinforced concrete (RC) structures in order to investigate on the mechanical properties of concrete and for structural health monitoring purposes. Even if the engineering practice discourages to drill columns, this can be often unavoidable. In this last case the presence of the circular opening influences the compressive behavior of the column in terms of load-carrying capacity and axial deformability. The goal of this investigation was the experimental evaluation of the effects induced by circular openings on the behavior of RC columns. Twenty-four reinforced and plain concrete prisms in presence of circular openings were tested in compression. The effects of concrete strength, hole diameter and repairing were taken into account. Axial loads and strains were recorded during the tests in order to evaluate the effects of key parameters. Finally, analytical predictions of the load-carrying capacity were made with a strut-and-tie model available in the literature, which was also used to estimate the load-shortening curves showing good agreement with experimental data.

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Abbreviations

A s :

Area of longitudinal steel bars

b :

Width of the specimens

d :

Diameter of the opening

F :

In-plane axial concentric load

f c :

Cylinder compressive strength of concrete

f t :

Splitting tensile strength of concrete

f y :

Yield strength of transverse reinforcement

H :

Height of specimens

l :

Y-coordinate of point of origin of isostatic line of compression

T :

Transverse tensile force

t :

Thickness of specimens

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Authors and Affiliations

  1. DICAM, University of Palermo, Viale delle Scienze, 90128, Palermo, Italy

    G. Campione & C. Cucchiara

  2. Facoltà di Ingegneria e Architettura, University of Enna “Kore”, Cittadella Universitaria, 94100, Enna, Italy

    G. Minafò

Authors
  1. G. Campione
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  2. C. Cucchiara
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  3. G. Minafò
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Corresponding author

Correspondence to G. Campione.

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Campione, G., Cucchiara, C. & Minafò, G. Effects of circular openings on the compressive behaviour of R.C. columns. Mater Struct 48, 1995–2008 (2015). https://doi.org/10.1617/s11527-014-0288-5

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  • DOI: https://doi.org/10.1617/s11527-014-0288-5

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