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Stress-strain relationships of reinforced concrete in biaxial tension-compression / Belarbi, Abdeldjelil 

Public ISBD Titre : Stress-strain relationships of reinforced concrete in biaxial tension-compression Type de document : texte imprimé Auteurs : Belarbi, Abdeldjelil, Auteur ; Thomas T. C. Hsu, Directeur de thèse Editeur : University of Houston Année de publication : 1991 Importance : 284 f. Présentation : ill. Format : 27 cm. Note générale : Thèse de Doctorat : Génie Civil : Houston, University of Houston : 1991 Volume 1 Bibliogr. f. 285 - 297 Volume 2 Annexe f. 298 - 471 Langues : Anglais (eng) Mots-clés : Shear  resistance Cracked  reinforced  concrete  panel Softened  truss  model  theory Stresses Strains Index. décimale : D001491 Résumé : The shear resistance of diagonally cracked, reinforced concrete panel elements is provided by an internal truss mechanism. The truss model consists of longitudinal and transverse reinforcement serving as the tensile members of the truss, while the diagonal concrete struts srve as the compressive members. A softened truss model theory was developed recently at the University of Houston for predicting the response of reinforced concrete subjected to in-plane shear and normal stresses. The theory based on the conditions of equilibrium and compatibility within elements, utilizes realistic constitutive laws for the reinforcements and the concrete. Relationships between stresses and strains are considered in terms of average values. The application of the softened truss model depends on the development of a set of constitutive laws for the concrete and the steel. To determine the average stress-strain relationships for these materials, twenty-two reinforced concrete panels were tested under biaxial stresses in a universal panel tester constructed at the University of Houston. The test panels were subjected to pure tension in one direction and compression in the perpendicular direction. They were reinforced by deformed steel bars in the direction of the applied principal stresses. Based on the test results, analytical expressions are derived for the stress-strain relationships of concrete in compression and in tension, as well as that for steel reinforcement stiffened by concrete. The test results reveal that the presence of tensile strains in one direction results in a significant deterioration of the strength and the stiffness of compression concrete in the perpendicular direction. A softened stress-strain relationship for concrete in compression is developed. The test results also suggest that the concrete develops substantial tensile stresses even after extensive cracking. Expressions are given relating the average principal tensile stress in the concrete to the average principal tensile strain of the panel. The stress-strain curve of mild steel bars stiffened by concrete does not exhibit a yield plateau and the so-called apparent yield stress is lower than the yield stress of a bare bar. Expressions are proposed to relate the average tensile stress in the steel to the average tensile strain. The application of these proposed stress-strain relationships for concrete and steel is limited to the case where the direction of the reinforcement coincides with the direction of the applied principal stresses. When the reinforcement is oriented in a direction different from the direction of the principal stresses, the proposed constitutive laws must be modified. Stress-strain relationships of reinforced concrete in biaxial tension-compression [texte imprimé] / Belarbi, Abdeldjelil, Auteur ; Thomas T. C. Hsu, Directeur de thèse . - [S.l.] : University of Houston, 1991 . - 284 f. : ill. ; 27 cm. Thèse de Doctorat : Génie Civil : Houston, University of Houston : 1991 Volume 1 Bibliogr. f. 285 - 297 Volume 2 Annexe f. 298 - 471 Langues : Anglais (eng) Mots-clés : Shear  resistance Cracked  reinforced  concrete  panel Softened  truss  model  theory Stresses Strains Index. décimale : D001491 Résumé : The shear resistance of diagonally cracked, reinforced concrete panel elements is provided by an internal truss mechanism. The truss model consists of longitudinal and transverse reinforcement serving as the tensile members of the truss, while the diagonal concrete struts srve as the compressive members. A softened truss model theory was developed recently at the University of Houston for predicting the response of reinforced concrete subjected to in-plane shear and normal stresses. The theory based on the conditions of equilibrium and compatibility within elements, utilizes realistic constitutive laws for the reinforcements and the concrete. Relationships between stresses and strains are considered in terms of average values. The application of the softened truss model depends on the development of a set of constitutive laws for the concrete and the steel. To determine the average stress-strain relationships for these materials, twenty-two reinforced concrete panels were tested under biaxial stresses in a universal panel tester constructed at the University of Houston. The test panels were subjected to pure tension in one direction and compression in the perpendicular direction. They were reinforced by deformed steel bars in the direction of the applied principal stresses. Based on the test results, analytical expressions are derived for the stress-strain relationships of concrete in compression and in tension, as well as that for steel reinforcement stiffened by concrete. The test results reveal that the presence of tensile strains in one direction results in a significant deterioration of the strength and the stiffness of compression concrete in the perpendicular direction. A softened stress-strain relationship for concrete in compression is developed. The test results also suggest that the concrete develops substantial tensile stresses even after extensive cracking. Expressions are given relating the average principal tensile stress in the concrete to the average principal tensile strain of the panel. The stress-strain curve of mild steel bars stiffened by concrete does not exhibit a yield plateau and the so-called apparent yield stress is lower than the yield stress of a bare bar. Expressions are proposed to relate the average tensile stress in the steel to the average tensile strain. The application of these proposed stress-strain relationships for concrete and steel is limited to the case where the direction of the reinforcement coincides with the direction of the applied principal stresses. When the reinforcement is oriented in a direction different from the direction of the principal stresses, the proposed constitutive laws must be modified.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
D001491	D001491	Papier	Bibliothèque centrale	Thèse de Doctorat	Disponible

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