Behaviour and design of demountable CFST column-column connections under tension

Dongxu Li, Brian Uy, Farhad Aslani, Vipul Patel

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    In the current construction practice, concrete-filled steel tubular (CFST) columns are difficult to be dismantled and relocated due to the continuous infilled concrete and reinforcement inside the columns. An innovative design method of the connections for CFST columns has been proposed herein, with which the CFST columns can be easily dismantled and reused. This study presents the experimental results on two demountable CFST column-column connections under eccentric tension. The initial stiffness, ultimate tensile strength, demountability as well as the post-peak behaviour is investigated. The present paper also develops a finite element model for the prediction of the tensile behaviour of the demountable CFST column-column connections. In the developed numerical model, the fracture of steel tubes under tensile loading and the failure of blind bolts due to shear force can be well simulated. Furthermore, a series of parametric studies have been carried out with the validated finite element model. Finally, the predictions from the finite element analysis were further compared with Australian Standard AS5100, and it was found that the practice code is slightly conservative in terms of the strength prediction and is safe to be used in engineering practice.

    Original languageEnglish
    Pages (from-to)761-773
    Number of pages13
    JournalJournal of Constructional Steel Research
    Volume138
    DOIs
    Publication statusPublished - 1 Nov 2017

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    Steel
    Concretes
    Bolts
    Numerical models
    Reinforcement
    Tensile strength
    Stiffness
    Finite element method

    Cite this

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    title = "Behaviour and design of demountable CFST column-column connections under tension",
    abstract = "In the current construction practice, concrete-filled steel tubular (CFST) columns are difficult to be dismantled and relocated due to the continuous infilled concrete and reinforcement inside the columns. An innovative design method of the connections for CFST columns has been proposed herein, with which the CFST columns can be easily dismantled and reused. This study presents the experimental results on two demountable CFST column-column connections under eccentric tension. The initial stiffness, ultimate tensile strength, demountability as well as the post-peak behaviour is investigated. The present paper also develops a finite element model for the prediction of the tensile behaviour of the demountable CFST column-column connections. In the developed numerical model, the fracture of steel tubes under tensile loading and the failure of blind bolts due to shear force can be well simulated. Furthermore, a series of parametric studies have been carried out with the validated finite element model. Finally, the predictions from the finite element analysis were further compared with Australian Standard AS5100, and it was found that the practice code is slightly conservative in terms of the strength prediction and is safe to be used in engineering practice.",
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    Behaviour and design of demountable CFST column-column connections under tension. / Li, Dongxu; Uy, Brian; Aslani, Farhad; Patel, Vipul.

    In: Journal of Constructional Steel Research, Vol. 138, 01.11.2017, p. 761-773.

    Research output: Contribution to journalArticle

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    KW - Fracture mechanism

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