A comparative assessment of ASM4 rockfall barrier modelling
Résumé
One key element of exible rockfall barriers is the net which intercepts the block trajectory. The ASM4 ring net is one of the widely spread net technology for medium to high energy impacts. The accurate modelling of its mechanical behaviour has thus been the aim of many research programs, most of which use the discrete elements method and tension members with material non-linearities. This paper proposes hence a comparison of the three main families of models: linear spring models, tensile ring models and exural ring models. First, homogenisation techniques are used to characterize intrinsic properties at local scale. Then, the question of the experimental identication of these properties is addressed. Afterwards, the relevance of the identied behaviour is investigated through two case studies. The rst one consists in a simple hyperbolic paraboloid structure which has a closed form solution involving large displacements. The second one is based on an experiment on a reduced scale barrier with centered impact and extend the comparison to various kind of data and loading cases. The conclusion presents the main results of the various comparisons, it gives insight on the features that each model can capture and provides some guidelines for designers at early stage design.
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