In reinforced concrete beams, the sectional definition of the moment-curvature relationship is not straightforward owing to the presence of cracks. In general, this problem has been solved by considering a representative portion of the beam and by defining the curvature 1/r as the ratio between the rotation of the portion considered and its length. Large portions of the beam with many cracks lead to "average" moment- curvature relationship, while small portions delimited by two consecutive flexural cracks lead to "local" moment-curvature relationship. The difference between these two definitions is studied in this paper introducing a "general model." With this model the entire beam is modeled through a succession of blocks divided by flexural cracks taking into account the bond between steel and concrete. Due to the practical impossibility of univocal definition of the crack pattern evolution, it is proposed to use a "range model." This "range," delimited by the curves of maximum and minimum deformability, includes the moment-curvature relationship (locals and average) obtained from all possible crack patterns.

Flexural deformability of reinforced concrete beams / Fantilli, A. P.; Ferretti, Daniele; Iori, Ivo; Vallini, P.. - In: JOURNAL OF STRUCTURAL ENGINEERING. - ISSN 0733-9445. - 124(9):(1998), pp. 1041-1049. [10.1061/(ASCE)0733-9445(1998)124:9(1041)]

Flexural deformability of reinforced concrete beams

FERRETTI, Daniele;IORI, Ivo;
1998-01-01

Abstract

In reinforced concrete beams, the sectional definition of the moment-curvature relationship is not straightforward owing to the presence of cracks. In general, this problem has been solved by considering a representative portion of the beam and by defining the curvature 1/r as the ratio between the rotation of the portion considered and its length. Large portions of the beam with many cracks lead to "average" moment- curvature relationship, while small portions delimited by two consecutive flexural cracks lead to "local" moment-curvature relationship. The difference between these two definitions is studied in this paper introducing a "general model." With this model the entire beam is modeled through a succession of blocks divided by flexural cracks taking into account the bond between steel and concrete. Due to the practical impossibility of univocal definition of the crack pattern evolution, it is proposed to use a "range model." This "range," delimited by the curves of maximum and minimum deformability, includes the moment-curvature relationship (locals and average) obtained from all possible crack patterns.
1998
Flexural deformability of reinforced concrete beams / Fantilli, A. P.; Ferretti, Daniele; Iori, Ivo; Vallini, P.. - In: JOURNAL OF STRUCTURAL ENGINEERING. - ISSN 0733-9445. - 124(9):(1998), pp. 1041-1049. [10.1061/(ASCE)0733-9445(1998)124:9(1041)]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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: https://hdl.handle.net/11381/1513018
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 63
  • ???jsp.display-item.citation.isi??? 56
social impact