Compressive Behaviour of Square CFDST Short Columns with Double Inner Steel Tubes

This study focuses on the experimental analysis of concrete-filled double-skin tubular (CFDST) short columns with double circular inner steel tubes under concentric axial loading. This cross-section layout promises to increase the ductile behavior of the compressive element and its energy absorption...

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Bibliographic Details
Published in:Key engineering materials 2022-05, Vol.920, p.211-221
Main Authors: Galarza, Fernando Palacios, Rocha, Joaquín H. Aquino
Format: Article
Language:English
Subjects:
Absorption cross sections
Axial loads
Axial strain
Compressive properties
Compressive strength
Concrete properties
Design factors
Ductility
Eccentricity
Energy absorption
Impact analysis
Reliability analysis
Resistance factors
Steel tubes
Ultimate tensile strength
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Summary:This study focuses on the experimental analysis of concrete-filled double-skin tubular (CFDST) short columns with double circular inner steel tubes under concentric axial loading. This cross-section layout promises to increase the ductile behavior of the compressive element and its energy absorption capacity, not to mention its ultimate axial strength. This research analyses main twofold variables: (i) Hollow ratio and (ii) eccentricity ratio (i.e., distance ratio between the inner tube’s separation and the sandwiched concrete width). As a result, load Vs. Axial deformation, load Vs. Axial strain curves, ductility index, strength index, energy absorption capacity, and ultimate axial capacity formulae for square CFDST columns with double circular inner tubes are reported. Key findings of this study show that (a) ductility is an intrinsic property of these types of sections; (b) the variation effect of hollow ratio influence inversely in the confined concrete strength of the element, (c) Eccentricity ratio has proved to be the least ultimate strength capacity influencer. However, its impact increases when it is jointly analyzed with the hollow ratio values. (d) The formulae proposed for predicting the ultimate capacity of CFDST columns showed good agreement with the experimental results. Thus, these expressions could be extended to the design of composite CFDST elements, provided a resistance factor based on a reliability analysis is incorporated.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/p-j1w791