DEN: Thesis SL-DEN-16-0083 - instn

DEN: Thesis SL-DEN-16-0083
RESEARCH FIELD
Mechanics, energetics, process engineering / Engineering science
TITLE
STRUCTURAL ASSESSMENT OF EXISTING REINFORCED CONCRETE STRUCTURES: COUPLING BETWEEN CORROSION AND
EARTHQUAKE LOADING
ABSTRACT
The corrosion phenomenon can be considered as one of the major pathologies affecting the reinforcing bars put in reinforced concrete
structure to handle tension loads and consequently, contributing to the loss of performance of existing buildings. This phenomenon is due
to the diffusion process in concrete of chemical species, such as chlorides or dioxide carbonyl. As soon as their content has reached a
specific threshold, an electro-chemical reaction takes place and rust products are created. The chemical nature of rust products depends
mainly on the nature of aggressive species responsible for their creation. More precisely, the corrosion phenomenon leads to three major
mechanical effects: (i) the reduction of the steel cross-section leading to a reduction of the local (at least) ductility; (ii) the initiation of
cracking from the steel reinforcing bars to the concrete cover due to the expansive nature of the rust products and (iii) the modification of
the bond properties at the steel/concrete interface according to the corrosion level. For the decades, noticeable works have been carried
out with the aim to better understand and predict the mechanical behavior of corroded reinforced concrete structures subjected to
monotonic loading. In particular, these works have led to the creation of data allowing quantifying the loss of the bearing capacity of
existing structures. However, only a few studies are available regarding the case of cyclic loading and none (according to our knowledge)
regarding the case of low velocity dynamic loading (such as earthquake loading). Within this framework, this work aims at bringing some
new pieces of knowledge to understand the effect of the corrosion phenomenon on the seismic response of reinforced concrete structures.
To reach this aim, the testing devices available on the TAMARIS operated by CEA experimental facility will be used.
The objectives of this work are (i) to define and follow up an experimental campaign including seismic tests to exhibit the effect of the
corrosion phenomenon on the seismic response of reinforced concrete structures, to analyze the experimental data to make the current
knowledge move forward and (iii) to formulate a simplified numerical model aiming at describing the main mechanical consequences from
the corrosion phenomenon on the seismic behavior of reinforced concrete structures.
LOCATION
Département de Modélisation des Systèmes et Structures
Service d'Etudes Mécaniques et Thermiques
Laboratoire d'Etudes de Mécanique Sismique
Place: Saclay
Start date of the thesis: 01/10/2016
CONTACT PERSON
Benjamin RICHARD
CEA
DEN/DM2S/SEMT/EMSI
Commissariat à l'énergie atomique et aux énergies alternatives
Institut national des sciences et techniques nucléaires
www­instn.cea.fr
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CEA Saclay
Batiment 603 - Pièce 8 - Point 112
91191 Gif-sur_Yvette CEDEX
Phone number: +33 1 69 08 76 74
Email: [email protected]
UNIVERSITY / GRADUATE SCHOOL
ENS Cachan
Annulé
FIND OUT MORE
https://www.linkedin.com/pub/benjamin-richard/16/75b/355
http://www-tamaris.cea.fr/
THESIS SUPERVISOR
Frédéric RAGUENEAU
ENS Cachan
LMT Cachan / Paris VI
L.M.T. Cachan
61 Avenue du Président Wilson 94235 CACHAN Cedex
Commissariat à l'énergie atomique et aux énergies alternatives
Institut national des sciences et techniques nucléaires
www­instn.cea.fr
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