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Materials 2016, 9(4), 278; doi:10.3390/ma9040278

Experimental Study of Damage Evolution in Circular Stirrup-Confined Concrete

1,2
,
1,2
,
1,2,* and 3,*
1
School of Civil and Environment Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2
IoT Application Technology Center of NDT, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
3
Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 27 January 2016 / Revised: 31 March 2016 / Accepted: 31 March 2016 / Published: 8 April 2016
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Abstract

This paper presents an experimental study on circular stirrup-confined concrete specimens under uniaxial and monotonic load. The effects of stirrup volume ratio, stirrup yield strength and concrete strength on damage evolution of stirrup-confined concrete were investigated. The experimental results showed that the strength and ductility of concrete are improved by appropriate arrangement of the stirrup confinement. Firstly, the concrete damage evolution can be relatively restrained with the increase of the stirrup volume ratio. Secondly, higher stirrup yield strength usually causes larger confining pressures and slower concrete damage evolution. In contrast, higher concrete strength leads to higher brittleness, which accelerates the concrete damage evolution. A plastic strain expression is obtained through curve fitting, and a damage evolution equation for circular stirrup-confined concrete is proposed by introducing a confinement factor (C) based on the experimental data. The comparison results demonstrate that the proposed damage evolution model can accurately describe the experimental results. View Full-Text
Keywords: concrete; confinement; circular stirrups; damage evolution; experimental study concrete; confinement; circular stirrups; damage evolution; experimental study
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, Z.; Peng, Z.; Teng, J.; Wang, Y. Experimental Study of Damage Evolution in Circular Stirrup-Confined Concrete. Materials 2016, 9, 278.

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