Skip to Main content Skip to Navigation
Theses

Modélisation multi-échelles du comportement thermo-hydro-mécanique des matériaux hétérogènes. Applications aux matériaux cimentaires sous sollicitations sévères.

Abstract : The work of modeling presented here relates to the study of the thermo-hydro-mechanical behaviour of porous materials based on hydraulic binder such as concrete, High Performance Concrete or more generally cement-based materials. This work is based on the exploitation of the Digital Concrete model, of the finite element code Symphonie developed in the Scientific and Technical Centre for Building (CSTB), in coupling with the homogenization methods to obtain macroscopic behaviour laws drawn from the Micro-Macro relations. Scales of investigation, macroscopic and microscopic, has been exploited by simulation in order to allow the comprehension fine of the behaviour of cement-based materials according to thermal, hydrous and mechanical loads. It appears necessary to take into account various scales of modeling. In order to study the behaviour of the structure, we are brought to reduce the scale of investigation to study the material more particularly. The research tasks presented suggest a new approach for the identification of the multi-physic behaviour of materials by simulation. In complement of the purely experimental approach, based on observations on the sample with measurements of the apparent parameters on the macroscopic scale, this new approach allows to obtain the fine analysis of elementary mechanisms in acting within the material. These elementary mechanisms are at the origin of the evolution of the macroscopic parameters measured in experimental tests. In this work, coefficients of the thermo-hydro-mechanical behaviour law of porous materials and the equivalent hydraulic conductivity were obtained by a multi-scales approach. Applications has been carried out on the study of the damaged behaviour of cement-based materials, in the objective to determine the elasticity tensor and the permeability tensor of a High Performance Concrete at high temperatures under a mechanical load. Also, the study of the strain evolution of cement-based materials at low temperatures. The results obtained has been confronted with experimental results. These results were also analyzed and discussed in order to propose prospects with an aim of improving the approach to simulate a more complex behaviour.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00081145
Contributor : Frédéric Alain Grondin <>
Submitted on : Thursday, June 22, 2006 - 12:35:19 PM
Last modification on : Monday, February 15, 2021 - 10:37:30 AM
Long-term archiving on: : Tuesday, September 18, 2012 - 3:00:43 PM

Identifiers

  • HAL Id : tel-00081145, version 1

Citation

Frédéric Alain Grondin. Modélisation multi-échelles du comportement thermo-hydro-mécanique des matériaux hétérogènes. Applications aux matériaux cimentaires sous sollicitations sévères.. Mécanique [physics.med-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00081145⟩

Share

Metrics

Record views

902

Files downloads

1151