Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Enhancing ultimate capacity: Experimental study on confinement effects of cylindrical concrete specimens using GFRP sheets and SMA helical wraps

Document Type : Original Article

Authors
Saeed Eilbeigi 1
Mohammadreza Tavakkolizadeh 2
Amirreza Masoodi 2
1 PhD candidate, Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
10.22065/jsce.2024.444114.3362
Abstract
Unreinforced concrete under uniaxial compressive stresses is recognized as a brittle material. To delay concrete spalling and improve its ductility, lateral confinement is commonly employed. Confinement pressure can be applied to concrete in both passive and active forms. Passive confinement is achieved through internal transverse reinforcements (such as stirrups, hoops, closed ties), external steel helical wraps, steel jackets, or FRP jackets. Active confinement pre-stresses the reinforced concrete member in the transverse directions prior to loading. Recently, researchers have explored the use of smart materials, specifically Shape Memory Alloys (SMAs), to exploit the effects of active confinement. Hybrid confinement, combining passive confinement (imposed by FRP sheets) and active confinement (imposed by SMA helical wraps), has also been investigated. In this experimental study, the influence of different confinement methods (passive confinement with GFRP, active confinement with SMA, and hybrid confinement) on the behavior of confined concrete is examined. Four cylindrical specimens with dimensions of 305*152 mm were constructed in the laboratory of the Ferdowsi University of Mashhad. These specimens were subjected to uniaxial one-sided compressive loading without axial restraint. The results indicate that the use of SMA helical wraps in active confinement and hybrid confinement not only enhances the maximum resistance developed in the specimens but also has a significant effect on improving the ultimate strain in specimens with active and hybrid confinement compared to those without confinement and those confined passively.
Keywords
Shape Memory Alloy
GFRP Sheet
Hybrid Confinement
Concrete Cylindrical Specimen
Axial Loading

Subjects

 
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Journal of Structural and Construction Engineering
Volume 11, Issue 11 - Serial Number 88
February 2025
Pages 175-197

  • Receive Date 02 March 2024
  • Revise Date 02 May 2024
  • Accept Date 16 May 2024