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Analyse numérique du comportement mécanique d'arbres sous sollicitation aérodynamique turbulente

Abstract : Occurence of strong winds leads to important damage in forest stands, thus causing severe economical losses. The aerodynamic behaviour of the aerial system is a key component to understand risks and process of tree failure due to wind loading. A non-linear dynamic model of tree structure, based on the Finite Element Method, was developped in order to assess the mechanical behaviour of trees submitted to the atmosperic flow which is characterized by turbulent motions in forest environment. Numerical analysis is necessary to investigate the variability and the complex arrangement of tree aerial architecture. Free oscillations of three Pinus Pinaster saplings are studied with field measurements and numerical simulations. The role of crown structure in dynamic characteristics is analysed. In addition, the Finite Element model is applied to a mature Sitka Spruce (Picea Sitchensis) submitted to measured aerodynamic drag. Furthermore, design of experiments is carried out to indentify primary factors involved in the wind-firmness of a Maritime pine. Wind speeds and turbulence are simulated. The parameters that are studied belong to the material and geometrical characteristics of the tree. Results show the model ability to determine the dynamic characteristics of existing trees. They also highlight the influence of aerial architecture on the movement of trees induced by wind.
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https://tel.archives-ouvertes.fr/tel-00008956
Contributor : Damien Sellier <>
Submitted on : Tuesday, April 5, 2005 - 1:35:56 PM
Last modification on : Friday, October 23, 2020 - 4:52:04 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:32:52 PM

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  • HAL Id : tel-00008956, version 1

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Damien Sellier. Analyse numérique du comportement mécanique d'arbres sous sollicitation aérodynamique turbulente. Mécanique [physics.med-ph]. Université Sciences et Technologies - Bordeaux I, 2004. Français. ⟨tel-00008956⟩

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