Load-reversed push-out tests on rectangular CFST columns
File(s)
Author(s)
Qu, X
Chen, Z
Nethercot, DA
Gardner, L
Theofanous, M
Type
Journal Article
Abstract
Load-reversed push-out tests have been carried out on 6 rectangular concrete-filled steel tubular (CFST) columns with the aim of investigating the nature of the bond between the concrete infill and the steel tube, the contribution of each bond stress component (i.e. chemical adhesion, microlocking and macrolocking) and the development of macrolocking within four half-cycles of loading. The contribution of microlocking to the total bond strength was obtained from the comparison between the ultimate strength of normal specimens and lubricated specimens, which also revealed the detrimental effect of lubrication on the bond strength. The macrolocking contribution was obtained from the comparison between the ultimate strength achieved in the first half-cycle of loading τu1 and the ultimate strength achieved in the third half-cycle of loading τu3 of the non-lubricated specimens. The developed bond mechanisms were explained and details of the interface bond stress distribution were obtained from the recorded axial strain gradients in the steel tube. Finally, the concept of a critical shear force transfer length was introduced, and its implications on practical design discussed.
Date Issued
2013-02
Online Publication Date
2024-03-06T11:56:09Z
Date Acceptance
2012-11-03
ISSN
0143-974X
Publisher
Elsevier
Start Page
35
End Page
43
Journal / Book Title
Journal of Constructional Steel Research
Volume
81
Copyright Statement
Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0143974X1200243X
Publication Status
Published
Date Publish Online
2012-11-28