In this paper we consider a two-degrees-of-freedom, non-linear model aiming to describe internal friction phenomena which have been observed in some modified concrete specimens undergoing slow dynamic compression loads and having various amplitudes but never inducing large strains. The motivation for the theoretical effort presented here arose because of the experimental evidence described e.g. in Madeo (2006), and Bowland et al. (2012) in which dissipation loops for concrete-type materials are shown to have peculiar characteristics. Indeed, as (linear or non-linear) viscoelastic models do not seem suitable to describe neither qualitatively nor quantitatively the measured dissipation loops, we propose to introduce a micro-mechanism of Coulombe-type internal dissipation associated to the relative motion of the lips of the micro-cracks present in the material. We finally present numerical simulations showing that the proposed model is suitable to describe some of the available experimental evidences. These numerical simulations motivate further developments of the considered model and supply a tool for the design of subsequent experi- mental campaigns.

A simple non-linear model for internal friction in modified concrete / Scerrato, Daria; Giorgio, Ivan; A., Madeo; A., Limam; F., Darve. - STAMPA. - 80:(2014), pp. 136-152. [10.1016/j.ijengsci.2014.02.021]

A simple non-linear model for internal friction in modified concrete

SCERRATO, DARIA;GIORGIO, IVAN;
2014

Abstract

In this paper we consider a two-degrees-of-freedom, non-linear model aiming to describe internal friction phenomena which have been observed in some modified concrete specimens undergoing slow dynamic compression loads and having various amplitudes but never inducing large strains. The motivation for the theoretical effort presented here arose because of the experimental evidence described e.g. in Madeo (2006), and Bowland et al. (2012) in which dissipation loops for concrete-type materials are shown to have peculiar characteristics. Indeed, as (linear or non-linear) viscoelastic models do not seem suitable to describe neither qualitatively nor quantitatively the measured dissipation loops, we propose to introduce a micro-mechanism of Coulombe-type internal dissipation associated to the relative motion of the lips of the micro-cracks present in the material. We finally present numerical simulations showing that the proposed model is suitable to describe some of the available experimental evidences. These numerical simulations motivate further developments of the considered model and supply a tool for the design of subsequent experi- mental campaigns.
2014
Continua with microstructure; Energy dissipation under cyclic load; Modified concrete
01 Pubblicazione su rivista::01a Articolo in rivista
A simple non-linear model for internal friction in modified concrete / Scerrato, Daria; Giorgio, Ivan; A., Madeo; A., Limam; F., Darve. - STAMPA. - 80:(2014), pp. 136-152. [10.1016/j.ijengsci.2014.02.021]
File allegati a 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/11573/542357
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 55
  • ???jsp.display-item.citation.isi??? 45
social impact