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Modélisation numérique discrète du comportement mécanique sous impact des structures d'écrans de filets pare-pierres

Abstract : This thesis introduces a generic model of rockfall barriers under impact loading. The structures are described as an abstract assembly of their main components. The developed model thereby enables the consideration of most of the existing technologies. A C++ code based on the Discrete Element Method is developed in order to perform the numerical simulations of impacts. The generic description of the barriers is implemented at the code level using a corresponding data structure and object-oriented programming. The generic model is completed by the mechanical models of two components. First, a mechanical model of 4-contact interlaced ring nets is developed. An experimental campaign is carried out to calibrate and validate the model against steel wire rings used in rockfall restraining nets. Second, a general sliding cable model is developed to account for the curtain effect. This model demonstrates great capabilities in describing sliding phenomena and a low computational cost. Finally, full-scale impact tests performed on two barriers of different technologies are used to validate the generic model. Numerical simulations of the full-scale tests highlight the relevance of the developed model. Numerical results agree finely with experiments and the model exhibits compelling predictive capacities for engineering applications. Deformations, loading time and forces magnitude are all predicted within 10 % relative error. Complex and unprecedented simulations of repeated impacts are carried out and the model is able to reproduce the barrier behavior both during the impact phase and after springback.
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Submitted on : Thursday, March 15, 2018 - 12:16:07 PM
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Jibril Coulibaly. Modélisation numérique discrète du comportement mécanique sous impact des structures d'écrans de filets pare-pierres. Mécanique des structures [physics.class-ph]. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI040⟩. ⟨tel-01734991⟩

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