The paper analyses the behaviour of concrete in the case of quasi-static fracture. The attention is focused on the interaction between strain-softening and time-dependent behaviour: a viscous rheological element (based on a fractional order rate law) is coupled with a micromechanical model for the fracture process zone. This approach makes it possible to include a whole range of dissipative mechanisms in a single Rheological element. Creep fracture in mode I conditions is analysed through the finite element method and the cohesive (or fictitious) crack model. The comparison with creep tests executed on three-point bending conditions (three different load levels) shows a good agreement both in terms of failure-lifetime, and, load-displacement.

A Fractional Order Rate Approach for Modeling Concrete Structures Subjected to Creep and Fracture / Barpi, Fabrizio; Valente, Silvio. - In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES. - ISSN 0020-7683. - STAMPA. - 41/9-10:(2004), pp. 2607-2621. [10.1016/j.ijsolstr.2003.12.025]

A Fractional Order Rate Approach for Modeling Concrete Structures Subjected to Creep and Fracture

BARPI, Fabrizio;VALENTE, Silvio
2004

Abstract

The paper analyses the behaviour of concrete in the case of quasi-static fracture. The attention is focused on the interaction between strain-softening and time-dependent behaviour: a viscous rheological element (based on a fractional order rate law) is coupled with a micromechanical model for the fracture process zone. This approach makes it possible to include a whole range of dissipative mechanisms in a single Rheological element. Creep fracture in mode I conditions is analysed through the finite element method and the cohesive (or fictitious) crack model. The comparison with creep tests executed on three-point bending conditions (three different load levels) shows a good agreement both in terms of failure-lifetime, and, load-displacement.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1397617
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