In order to obtain adequate serviceability and good durability of structures, international standards limit the crack width either through a direct calculation or by adopting specific measures. However, cracking behaviour is very complex because of the huge number of parameters that can have a significant effect on it. This complexity is also confirmed by the high scattering of the test results or by the several formulae that are adopted to theoretically govern the phenomenon. The cracking behaviour of reinforced concrete structures under bending, with or without axial forces, can be described with a model based on the bond stress-slip relationship, tau-s, between concrete and steel. A model of this type based on the bond law proposed by CEB-FIP Model Code 1990 was developed in the literature to predict the mechanical behaviour of a reinforced concrete tie subjected to a monotonic loading, both in the crack formation phase and the stabilized cracking phase. However, the adoption of the bond stress-slip relationship as it is fails to comply with the equilibrium condition and contradicts the experimental condition of fixed crack pattern. These inconsistencies can be overcome considering the effect of the so-called Goto cracks or secondary cracks which leads to a decreasing trend of the bond stresses around the crack. The effect of secondary cracks on the cracking behaviour of an r.c. tie in the stabilized cracking phase is also analysed through a parametric analysis, which highlights how and to what extent their influence zone varies as a function of the axial force, the concrete strength, the reinforcement ratio and the bar diameter.

Effect of Secondary Cracks for Cracking Analysis of Reinforced Concrete Tie / Debernardi, PIER GIORGIO; Guiglia, Matteo; Taliano, Maurizio. - In: ACI MATERIALS JOURNAL. - ISSN 0889-325X. - STAMPA. - 110:2(2013), pp. 207-214. [10.14359/51685535]

Effect of Secondary Cracks for Cracking Analysis of Reinforced Concrete Tie

DEBERNARDI, PIER GIORGIO;GUIGLIA, MATTEO;TALIANO, Maurizio
2013

Abstract

In order to obtain adequate serviceability and good durability of structures, international standards limit the crack width either through a direct calculation or by adopting specific measures. However, cracking behaviour is very complex because of the huge number of parameters that can have a significant effect on it. This complexity is also confirmed by the high scattering of the test results or by the several formulae that are adopted to theoretically govern the phenomenon. The cracking behaviour of reinforced concrete structures under bending, with or without axial forces, can be described with a model based on the bond stress-slip relationship, tau-s, between concrete and steel. A model of this type based on the bond law proposed by CEB-FIP Model Code 1990 was developed in the literature to predict the mechanical behaviour of a reinforced concrete tie subjected to a monotonic loading, both in the crack formation phase and the stabilized cracking phase. However, the adoption of the bond stress-slip relationship as it is fails to comply with the equilibrium condition and contradicts the experimental condition of fixed crack pattern. These inconsistencies can be overcome considering the effect of the so-called Goto cracks or secondary cracks which leads to a decreasing trend of the bond stresses around the crack. The effect of secondary cracks on the cracking behaviour of an r.c. tie in the stabilized cracking phase is also analysed through a parametric analysis, which highlights how and to what extent their influence zone varies as a function of the axial force, the concrete strength, the reinforcement ratio and the bar diameter.
File in questo prodotto:
File Dimensione Formato  
Letter by Editor of acceptance of manuscript for publication.pdf

non disponibili

Tipologia: Altro materiale allegato
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 13.79 kB
Formato Adobe PDF
13.79 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2498586
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo