Flexural Strength of Partially Concrete-Filled Steel Tubes Subjected to Lateral Loads by Experimental Testing and Finite Element Modelling

Journal article


Nguyen, T.T.T., Nguyen, V.B. and Thai, M.Q. 2023. Flexural Strength of Partially Concrete-Filled Steel Tubes Subjected to Lateral Loads by Experimental Testing and Finite Element Modelling. Buildings. 13 (1), pp. 1-31. https://doi.org/10.3390/buildings13010216
AuthorsNguyen, T.T.T., Nguyen, V.B. and Thai, M.Q.
Abstract

In this paper, the flexural strength and buckling of the partially concrete-filled steel tubes (PCFST) under laterally repeated loads was investigated through three-point bending test configuration. Three-dimensional Finite Element (FE) models of the bending tests of the PCFST were developed, in which the concrete filling was modelled using elastic-plastic-fracture model capturing crack development and the tube steel was modelled using elastic-plasticity model. The bond between concrete and tube was considered as frictional touching contact. The validation showed the FE results including the ultimate flexural load and buckling failure mode of the steel tube were in excellent agreement with the experimental ones. A parametric study was then conducted using the verified FE models to investigate the effects of the tube diameter-to-thickness ratio, the concrete filling length ratio, the compressive strength of concrete, and the tube steel’s yield and tensile strengths on the PCFST’s ultimate flexural strength. Based on this study, buckling modes, the optimal concrete filling lengths, and the confined compressive strengths of concrete were determined considering the effects of all these parameters. The confined compressive stresses and strains in concrete predicted by the FE models were evaluated against those determined by theoretical models. The results revealed that the effects of concrete compressive strength to the PCFST’s flexural capacity was insignificant while increasing the tube diameter-to-thickness ratio or the tube steel’s yield and tensile strengths could significantly increase the PCFST’s flexural capacity and the confined compressive strength of concrete; and there was an optimal length of concrete filling at about 66% of the tube length. It demonstrated that the Finite Element analysis can therefore be used as a powerful method to the analysis and design the PCFST columns under lateral loads.

Keywordspartially concrete-filled steel column; flexural strength; three-point bending test; lateral loading; confined concrete; Finite Element analysis
Year2023
JournalBuildings
Journal citation13 (1), pp. 1-31
PublisherMDPI
ISSN2075-5309
Digital Object Identifier (DOI)https://doi.org/10.3390/buildings13010216
Web address (URL)https://www.mdpi.com/2075-5309/13/1/216
Accepted author manuscript
File Access Level
Open
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online12 Jan 2023
Publication process dates
Accepted03 Jan 2023
Deposited11 Jul 2023
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