Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Fracture and size effect of PFRC specimens simulated by using a trilinear softening diagram: a predictive approach

Version 1 : Received: 19 May 2021 / Approved: 20 May 2021 / Online: 20 May 2021 (10:03:06 CEST)

How to cite: Suárez, F.; Gálvez, J.C.; Alberti, M.G.; Enfedaque, A. Fracture and size effect of PFRC specimens simulated by using a trilinear softening diagram: a predictive approach. Preprints 2021, 2021050470 (doi: 10.20944/preprints202105.0470.v1). Suárez, F.; Gálvez, J.C.; Alberti, M.G.; Enfedaque, A. Fracture and size effect of PFRC specimens simulated by using a trilinear softening diagram: a predictive approach. Preprints 2021, 2021050470 (doi: 10.20944/preprints202105.0470.v1).

Abstract

Size effect on plain concrete specimens is well known and can be correctly captured when performing numerical simulations by using a well characterised softening function, but in the case of fibre reinforced concrete this is not directly applicable, since an only diagram cannot capture the material behaviour on elements with different size due to dependence of the orientation factor of the fibres with the size of the specimen. In previous works, the use of a trilinear softening diagram proved to be very convenient for reproducing fracture of polyolefin fibre reinforced concrete elements, but only if it is previously adapted for each specimen size. In this work, a predictive methodology is used to reproduce fracture of polyolefin fibre reinforced concrete specimens of different sizes under three-point bending. Fracture is reproduced by means of a well known embedded cohesive model, with a trilinear softening function that is defined specifically for each specimen size. The fundamental points of these softening functions are defined a priori by using empirical expressions proposed in past works, based on an extensive experimental background. Therefore, the numerical results are obtained in a predictive manner, and then compared with a previous experimental campaign, showing that this approach properly captures the size effect, although some values of the fundamental points in the trilinear diagram could be defined more accurately.

Subject Areas

Size effect; Polyolefin fibre reinforced concrete; Trilinear softening function; Cohesive model

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