The Cell Method (CM) code with auto-matic remeshing for crack propagation analysis [6] is here used for modelling the pullout test. Particular emphasis is given to the analysis in the Mohr-Coulomb plane, since previous numerical models were not decisive in describing failure mechanism in pullout tests. The interpretations of ex-perimental and analytical studies vary widely, and none of the existing explana-tions offer a complete description of the progressive failure of the concrete medium [21]. Nor do most existing interpretations appear to be totally compatible with the experimental evidence. Analysis of the failure mechanism for the pullout test requires a failure criterion ac-curately describing crack initiation in ten-sion loading. The Mohr-Coulomb criterion of the first code [6] has therefore been abandoned in favour of a more realistic criterion for the tensile state of stress, the Leon criterion. The failure analysis has been performed for several ratios between the counterpres-sure diameter and the stem length (Fig. 1). Moreover, the complete crack path has been obtained for the geometry of the Lok-test. The evolving state of stress-strain for the Lok-test is also provided. The identification of the directions of principal stress completes the stress analy-sis. Modelling is performed both on the concrete specimen and on the steel insert, showing how the CM can easily handle domains with several materials.

Modeling of The Pullout Test Through the Cell Method / Ferretti E.. - STAMPA. - (2004), pp. 180-192. (Intervento presentato al convegno International Conference of Restoration, Recycling and Rejuvenation Technology for Engineering and Architecture Application tenutosi a Cesena nel 7-11 Giugno).

Modeling of The Pullout Test Through the Cell Method

FERRETTI, ELENA
2004

Abstract

The Cell Method (CM) code with auto-matic remeshing for crack propagation analysis [6] is here used for modelling the pullout test. Particular emphasis is given to the analysis in the Mohr-Coulomb plane, since previous numerical models were not decisive in describing failure mechanism in pullout tests. The interpretations of ex-perimental and analytical studies vary widely, and none of the existing explana-tions offer a complete description of the progressive failure of the concrete medium [21]. Nor do most existing interpretations appear to be totally compatible with the experimental evidence. Analysis of the failure mechanism for the pullout test requires a failure criterion ac-curately describing crack initiation in ten-sion loading. The Mohr-Coulomb criterion of the first code [6] has therefore been abandoned in favour of a more realistic criterion for the tensile state of stress, the Leon criterion. The failure analysis has been performed for several ratios between the counterpres-sure diameter and the stem length (Fig. 1). Moreover, the complete crack path has been obtained for the geometry of the Lok-test. The evolving state of stress-strain for the Lok-test is also provided. The identification of the directions of principal stress completes the stress analy-sis. Modelling is performed both on the concrete specimen and on the steel insert, showing how the CM can easily handle domains with several materials.
2004
RRRTEA ‘04 [restoration, recycling and rejuvenation technology for engineering and architecture application] Up-to-date knowledge related structure reinforcement, protection, life extension and environmental consideration
180
192
Modeling of The Pullout Test Through the Cell Method / Ferretti E.. - STAMPA. - (2004), pp. 180-192. (Intervento presentato al convegno International Conference of Restoration, Recycling and Rejuvenation Technology for Engineering and Architecture Application tenutosi a Cesena nel 7-11 Giugno).
Ferretti E.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/18397
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