Experimental assessment of the cyclic behaviour of concrete-to-concrete interfaces subjected to combined shear and bending moment

Eduardo Cavaco, Tiago Almeida, José Câmara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Ductility of Reinforced Concrete (RC) members connections is of paramount importance on seismic regions, regarding energy dissipation. Recent research has suggested that the presence of concrete-to-concrete interfaces subjected to shear force and bending moments, can potentially reduce ductility of RC beams under monotonic loading, due to the occurrence of a shear slippage along the interfaces. In this paper, the cyclic behaviour of RC beams with concrete-to-concrete interfaces subjected to shear force and bending moment, is experimentally investigated by submitting specimens to a load protocol consisting into cycles of reverse imposed displacements, with growing amplitude. Concrete-to-concrete interfaces are located on the hogging region to recreate a practical situation of the precast construction where continuity between precast elements (columns, beams and slabs) is ensured by localized casting of joint connections in situ. Three types of casting interfaces were studied: (i) vertical and unreinforced; (ii) vertical and reinforced; and (iii) diagonal and unreinforced. In all the cases, no special treatment to increase the interfaces' roughness was carried out. The results obtained were compared to those of a reference specimen produced without casting interfaces. Results show that the presence of casting interfaces do not reduce the specimens' maximum strength but can reduce the percentage of cycles sustained after yielding, up to failure, in 9% to 15%. Ductility, measured in terms of the ratio between ultimate and yielding displacements, is reduced in 30%. Interface reinforcement and interface direction have negligible influence on the specimens' behaviour.

Original languageEnglish
Pages (from-to)1150-1164
JournalMagazine of Concrete Research
Volume74
Issue number22
Early online date13 Apr 2022
DOIs
Publication statusPublished - Nov 2022

Keywords

  • Concrete-to-Concrete Interface
  • Cyclic behavior
  • Ductility
  • Plastic hinge
  • Precast Construction
  • Shear-friction

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