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Etude théorique et expérimentale du flambement des pieux

Abstract : The buckling of micropiles can occur especially when they are founded through weak soils. In case of more standand piles, the flexura! deformation due to lateral loads is sensitive to the vertical loads acting on the pile. These two phenomena cannot be taken into account by commonly used theories of strengh of materials. The aim of this reseach is to consider the geometrical nonlinearities of the pile (second order effect, large displacement), in order to better study the pile response due to such phenomena and to better estimate the critical buckling load that it can support. A bibliographic research is undertaken which concludes that Mandel's theory is the most used in practice. Secondly, a theoretical approach to take into account the geometric nonlinearities is developed. This approach is implemented into a numerical code "GOUFLA". The code validation is carried out by comparing the results to those obtained by the finite element code CESAR-LCPC and to analytical solutions given by Mandel. The results of a centrifuge testing program on axially loaded piles is presented. Centrifuge measurements are used to validate the theoretical estimations. A method is proposed to estimate the buckling load when using the Mandel theory. These measurements are also used to validate the numerical results obtained by GOUFLA. Finally, the programm GOUFLA is used to predict buckling design loads for several existing structures. The analysis of a buckling test on a full scale micropile is presented.
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Emile Youssef. Etude théorique et expérimentale du flambement des pieux. Matériaux. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨tel-00523301⟩

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