Numerical rigid plastic modelling of shear capacity of keyed joints

Morten Andersen Herfelt, Peter Noe Poulsen, Linh Cao Hoang, Jesper F. Jensen

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    Keyed shear joints are currently designed using simple and conservative design formulas, yet these formulas do not take the local mechanisms in the concrete core of the joint into account. To investigate this phenomenon a rigid, perfectly plastic finite element model of keyed joints is used. The model is formulated for second-order conic optimisation as a lower bound problem, which yields a statically admissible stress field that satisfies the yield condition in every point. The dual solution to the problem can be interpreted as the collapse mode and will be used to analyse the properties of the different joints. This approach makes it possible to investigate both global and local failure mechanisms in keyed joints. The results of the model will be compared to experiments found in the literature as well as the current design rules of the Eurocode.
    Original languageEnglish
    Title of host publicationProceedings of fib Symposium 2015
    Number of pages14
    Publication date2015
    Publication statusPublished - 2015
    EventFib Symposium 2015 : Concrete - Innovation and Design - Copenhagen, Denmark
    Duration: 18 May 201520 May 2015


    ConferenceFib Symposium 2015
    Internet address


    • Finite element
    • Keyed joints
    • Limit analysis
    • Numerical method
    • Precast concrete element
    • Rigid plasticity


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