Push-out tests and bond strength of rectangular CFST columns

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Title: Push-out tests and bond strength of rectangular CFST columns
Authors: Qu, X
Chen, Z
Nethercot, DA
Gardner, L
Theofanous, M
Item Type: Journal Article
Abstract: Push-out tests have been conducted on 18 rectangular concrete-filled steel tubular (CFST) columns with the aim of studying the bond behaviour between the steel tube and the concrete infill. The obtained load-slip response and the distribution of the interface bond stress along the member length and around the cross-section for various load levels, as derived from measured axial strain gradients in the steel tube, are reported. Concrete compressive strength, interface length, cross-sectional dimensions and different interface conditions were varied to assess their effect on the ultimate bond stress. The test results indicate that lubricating the steel-concrete interface always had a significant adverse effect on the interface bond strength. Among the other variables considered, concrete compressive strength and cross-section size were found to have a pronounced effect on the bond strength of non-lubricated specimens for the range of cross-section geometries considered, which is not reflected in the European structural design code for composite structures, EN 1994-1-1 (2004). Finally, based on nonlinear regression of the test data generated in the present study, supplemented by additional data obtained from the literature, an empirical equation has been proposed for predicting the average ultimate bond strength for SHS and RHS filled with normal strength concrete.
Issue Date: 1-Jul-2015
Date of Acceptance: 18-Dec-2014
URI: http://hdl.handle.net/10044/1/41920
DOI: https://dx.doi.org/10.12989/scs.2015.19.1.021
ISSN: 1229-9367
Publisher: Techno-press
Start Page: 21
End Page: 41
Journal / Book Title: Steel and Composite Structures
Volume: 19
Issue: 1
Copyright Statement: Copyright © 2015 Techno-Press, Ltd.
Keywords: Science & Technology
Construction & Building Technology
Engineering, Civil
Materials Science, Composites
Materials Science
composite construction
concrete filled steel tubes
interface bond strength
interface condition
push-out test
Civil Engineering
0905 Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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