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Phénomènes d'interaction sol-structure vis-à-vis de l'aléa retrait-gonflement pour l'évaluation de la vulnérabilité des ouvrages

Abstract : Clayey soils can present large volumetric deformations in response of water content change. This phenomenon of shrinkage and swelling of clayey soils is recognized as a costly natural hazard throughout the world. In France, this cost is reported between 1988 and 2007 to 5 million Euros, ranking in second class of the French natural hazards in terms of cost of damage after the floods. The individual masonry buildings with shallow foundations are the most affected by this phenomenon that causes a differential settlement of the building leading to cracks in facades and structural elements, especially in unreinforced masonry elements. The objective of this thesis was to study the vulnerability of the building, against the shrink-swell hazard through an analysis of soil-structure interaction. This work was focused on three major points: hydro-mechanical behavior of clay soils, soil-structure interaction and evaluation of structural damage. The hydro-mechanical behavior of clay soils was considered by the concept of state surface and integrated into a soil-structure interaction model, based on the Winkler model, with increasingly complex approaches: 1D, 2D and 3D by modeling the building behavior respectively by a spring system, the beam element and the plate element. These models of soil-structure interaction are able to calculate the relative deflection of the building, according to the values of imposed suction, mechanical properties of the structure and hydro-mechanical properties of the soil. The relative deflection of the building is then compared to threshold values of the classical damage categories to assess the building damage. Finally a feasibility study was conducted on the development of vulnerability curves adapted to the problem of shrinkage - swelling of clayey soils. These curves represent the average of structural damage versus suction, for each type of building. These curves were developed based on a classification of expansive soils and a building typology outcome from databases of affected buildings. The average damage is calculated by the Monte-Carlo method, taking into account the variability of the building parameters.
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https://theses.hal.science/tel-01749511
Contributor : Emad Jahangir Connect in order to contact the contributor
Submitted on : Friday, February 24, 2012 - 6:42:10 PM
Last modification on : Monday, November 9, 2020 - 9:46:03 AM
Long-term archiving on: : Friday, May 25, 2012 - 2:30:09 AM

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  • HAL Id : tel-01749511, version 2

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Emad Jahangir. Phénomènes d'interaction sol-structure vis-à-vis de l'aléa retrait-gonflement pour l'évaluation de la vulnérabilité des ouvrages. Mécanique des solides [physics.class-ph]. Institut National Polytechnique de Lorraine - INPL, 2011. Français. ⟨NNT : 2011INPL088N⟩. ⟨tel-01749511v2⟩

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