Fissuration du bois en climat variable sous charges de longues durées : applications aux essences européennes et gabonaises

Abstract : In structure, wood is subjected to different loadings, where the principals are physical, mechanical and environmental. The coupling of these different loadings, make the understand of the mechanical behaviour of wood difficult. The aim of this thesis is to highlight, through a protocol for monitoring the evolution of the deflection, the impact of the conditions of climatic variations on the lifetime of timber of the notched beams. The work is essentially based around two major axes highlighting, respectively, a new experimental devices and a new analytical approach of the following of the evolution of the beam deflection, in outdoor conditions. The experimental device takes into account: the monitoring of the evolution of the notched-beam deflection; the cracking processes of wood, in particular the following of its initiation, the opening and the propagation of the tip of crack which appeared, on the notched-beam until its collapse; the monitoring of the climatic parameters such as temperature, the environmental relative humidity and the variations of the moisture content of the beams during the test. The results show that the variations of these climatic parameters favour the acceleration of the wood aging process in the structure. The analytical model of the evolution of the deflection of a notched beam, shown in this work, is based on the classical hypotheses of Timoshenko’s beam theory and all the experimental results obtained. It takes into account the cracking processes of notched-beam, the variations of its moisture content and the intensity of the loading applied on the beam.
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Claude Feldman Pambou Nziengui. Fissuration du bois en climat variable sous charges de longues durées : applications aux essences européennes et gabonaises. Génie civil. Université Clermont Auvergne, 2019. Français. ⟨NNT : 2019CLFAC018⟩. ⟨tel-02310783⟩

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