Effect of confinement on the efficiency of bottle-shaped struts. Issue 18 (22nd June 2018)

• Record Type: Journal Article
• Authors: Sahoo, Dipak Kumar; Varghese, Biju P.
• Is Part Of: Magazine of concrete research. Volume 71:Issue 18(2019)
• Page Start: 965
• Page End: 974
• Publication Date: 2018-06-22
• Subjects: load transfer -- modelling -- plain concrete; Concrete -- Periodicals; Concrete construction -- Periodicals; Concrete -- Testing -- Periodicals; 624.1834
• DOI: 10.1680/jmacr.17.00427
• Languages: English
• ISSNs: 0024-9831

Abstract

Abstract : Isolated strut tests were performed to study the effect of plain concrete lateral confinement on the efficiency of two-dimensional (2D) and three-dimensional (3D) bottle-shaped struts. For the 2D struts, thin plain concrete panels of varying width were tested to failure under in-plane compression. For the 3D struts, short square columns of varying cross-section were tested to failure under axial compression. The strut efficiency in short columns was found to increase with cross-section as expected, although the increase became insignificant beyond a certain limit. However, the strut efficiency in the panels increased with an increase in panel width only up to half the panel height and thereafter reduced significantly. Supported by finite-element modelling, the results revealed the hitherto unknown phenomenon that excessive confinement negatively impacts on the efficiency of wide bottle-shaped struts only in planar (plane stress) concrete members.