[article] 
inJournal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 209-219

Titre :	Stiffness degradation and time to cracking of cover concrete in reinforced concrete structures subject to corrosion
Type de document :	texte imprimé
Auteurs :	Jinquan Zhong, Auteur ; Paolo Gardoni, Auteur ; David Rosowsky, Auteur
Année de publication :	2010
Article en page(s) :	pp. 209-219
Note générale :	Mécanique appliquée
Langues :	Anglais (eng)
Mots-clés :	Cracking Energy Corrosion Reinforced concrete Stiffness Degradation Concrete structures
Résumé :	Corrosion-induced cracks in reinforced concrete (RC) structures degrade the stiffness of the cover concrete. The stiffness degradation is mainly caused by the softening in the stress-strain relation in the cracked concrete. Limited efforts have been made to model the cracking and the corresponding effects on the cover concrete, despite of its importance in assessing and modeling the behavior of RC structures. This paper proposes a stiffness degradation factor to model the stiffness degradation of the cover concrete subject to cracking. The proposed factor is computed in terms of the cracking strain corresponding to the maximum opening of the concrete cracks based on an energy principle applied to a fractured RC structure. The time to cracking of the cover concrete is then determined as the time from the corrosion initiation needed by the crack front to reach the outer surface of the cover concrete. The proposed stiffness degradation factor and the method to compute the time to cracking are illustrated through two numerical examples. The times to cracking of the cover concrete that are predicted using the proposed method are in agreement with the measured values from laboratory experiments.
DEWEY :	620.1
ISSN :	0733-9399
En ligne :	http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

[article] Stiffness degradation and time to cracking of cover concrete in reinforced concrete structures subject to corrosion [texte imprimé] / Jinquan Zhong, Auteur ; Paolo Gardoni, Auteur ; David Rosowsky, Auteur . - 2010 . - pp. 209-219.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 209-219

Mots-clés :	Cracking Energy Corrosion Reinforced concrete Stiffness Degradation Concrete structures
Résumé :	Corrosion-induced cracks in reinforced concrete (RC) structures degrade the stiffness of the cover concrete. The stiffness degradation is mainly caused by the softening in the stress-strain relation in the cracked concrete. Limited efforts have been made to model the cracking and the corresponding effects on the cover concrete, despite of its importance in assessing and modeling the behavior of RC structures. This paper proposes a stiffness degradation factor to model the stiffness degradation of the cover concrete subject to cracking. The proposed factor is computed in terms of the cracking strain corresponding to the maximum opening of the concrete cracks based on an energy principle applied to a fractured RC structure. The time to cracking of the cover concrete is then determined as the time from the corrosion initiation needed by the crack front to reach the outer surface of the cover concrete. The proposed stiffness degradation factor and the method to compute the time to cracking are illustrated through two numerical examples. The times to cracking of the cover concrete that are predicted using the proposed method are in agreement with the measured values from laboratory experiments.
DEWEY :	620.1
ISSN :	0733-9399
En ligne :	http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]