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Approche probabiliste d'aide au diagnostic des voûtes en maçonnerie

Abstract : The vault structures are present in most of the old masonry structures: tunnels, bridges, palaces, cathedrals or other civil infrastructures. Arches and vaults as well as walls are the supporting structures used in masonry. Their condition is then the key of the proper functioning of a structure. Masonry construction works are now a significant proportion of the cultural heritage. Most of them are century old and the degradation process is already running since several decades. Actually, the maintenance and repair continue to represent serious issues for their managers. Sometimes repairs have been undertaken without ensuring the aimed durability. The frequency of interventions is increased and the resulting costs are rapidly becoming unbearable. A situation has led some managers to completely abandon their buildings, despite their heritage value and national significance. Indeed, one of the major reasons for building abandonment is the excessive cost of inspections and repairs. The question that arises in such circumstances is how to develop a maintenance strategy that is both effective and most economical of these structures, capable to prolong their lifespan?Two particular inspection issues under uncertainty are discussed: The localized presence of material loss and generalized loss of material. To deal both cases, a program was developed. The model on which it is based, provides the overall analysis of the vault while minimizing the computation time. This model presents an interesting compromise between accuracy and computation time. Monte Carlo simulations are coupled with the finite element method and implemented in a software package named ArcProg_Z, in order to propose a consistent methodology for probabilistic assessment of the load bearing capacity of the vaults and predicting its failure mechanism.Finally, reliability study of the vault is carried out. The performance of the vault is assessed by calculating the probability of failure “instantaneous and time-dependent” according to the coefficient of variation of the Young's modulus of several segments.The obtained results for each case are presented and discussed.
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Submitted on : Monday, October 17, 2016 - 9:59:07 AM
Last modification on : Saturday, March 26, 2022 - 4:26:35 AM


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  • HAL Id : tel-01382448, version 1



Abdelmounaim Zanaz. Approche probabiliste d'aide au diagnostic des voûtes en maçonnerie. Génie civil. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0052⟩. ⟨tel-01382448⟩



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