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Structural Engineering and Mechanics Volume 24, Number 4, November10 2006 , pages 411-427 DOI: https://doi.org/10.12989/sem.2006.24.4.411 |
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Aggregate shape influence on the fracture behaviour of concrete |
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N. Monteiro Azevedo and J. V. Lemos
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| Abstract | ||
| The Discrete Element Method, DEM, is increasingly used in fracture studies of non-homogeneous continuous media, such as rock and concrete. A 2D circular rigid DEM formulation, developed to model concrete, has been adopted. A procedure developed to generate aggregate particles with a given aspect ratio and shape is presented. The aggregate particles are modelled with macro-particles formed by a group of circular particles that behave as a rigid body. Uniaxial tensile and compression tests performed with circular and non-circular aggregates, with a given aspect ratio, have shown similar values of fracture toughness when adopting uniform strength and elastic properties for all the contacts. Non-circular aggregate assemblies are shown to have higher fracture toughness when different strength and elastic properties are set for the matrix and for the aggregate/matrix contacts. | ||
| Key Words | ||
| particle methods; discrete element; aggregate shape; concrete fracture. | ||
| Address | ||
| N. Monteiro Azevedo; Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Portugal J. V. Lemos; LNEC, Av. Brasil 101, 1700-066 Lisboa, Portugal | ||