Review on development of external steel-confined concrete. (30th June 2019)

• Record Type: Journal Article
• Authors: Chin, Chee-Loong; Ma, Chau-Khun; Tan, Jia-Yang; Ong, Chin-Boon; Awang, Abdullah Zawawi; Omar, Wahid
• Is Part Of: Construction & building materials. Volume 211(2019)
• Page Start: 919
• Page End: 931
• Publication Date: 2019-06-30
• Subjects: Ac area of concrete -- As area of longitudinal steel -- D diameter of concrete -- E eccentricity -- Ecm elastic modulus of concrete -- Es elastic modulus of steel -- fcc strength of concrete under confining action -- fco unconfined concrete strength -- fh hoop tension -- fl lateral confining pressure -- fvs direct axial contribution of steel/axial stress in steel -- fy yield stress of steel -- H height of concrete -- Ic second moment of area of concrete -- Is second moment of area of steel -- J3 third deviatoric stress invariant -- Ke confinement effectiveness ratio -- L length of column -- Nu load capacity of external steel-confined concrete -- p hydrostatic pressure -- q von Mises equivalent stress -- S centre spacing between steel hoops -- scl clear spacing between steel -- t total thickness of steel -- Vc volume of concrete -- Vs volume of steel -- w width of steel -- ρ confinement ratio -- λ slenderness ratio according to Eurocode 4 [14] -- cc peak strain of confined concrete -- co peak strain of unconfined concrete; Steel -- External confinement -- Confinement technique -- Steel-confined concrete -- Concrete strengthening; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.03.295
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Research conducted on external steel-confined concrete are discussed. Variables of structural performance of steel-confined concrete are summarised. Closed-form expressions for steel-confined concrete are reviewed. Finite element analysis models for confined concrete are critically reviewed. Abstract: Steel is a cheaper and more environmentally friendly alternative to externally confine concrete compared to the commonly known fiber-reinforced polymer (FRP). Numerous studies have been conducted both experimentally and analytically to understand the compressive behaviour of external steel-confined concrete. This paper presents an overview of four external steel-based confinement techniques for concrete followed up by review on existing closed-form expressions and finite element analysis models for external steel-confined concrete. It is shown that the four techniques can be generalised based on the strengthening mechanisms involved. Through this review, it is shown that effect of pre-load and pre-tension have not been taken into account by most previous research. Additionally, the parameters calibration for existing finite element analysis models were based on FRP-confined concrete experimental data only. The needs for future experimental investigation and analytical work for external steel-confined concrete are presented in the last part of this paper.