Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 80, Issue -, Pages 310-333Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2015.11.018
Keywords
Concrete; Particle packing; Voids; Meso-scale model; Cohesive zones; Monte Carlo simulation
Categories
Funding
- Faculty of Engineering and Physical Sciences via Dean's Scholarship Programme at University of Manchester, UK
- EPSRC [EP/J019763/1]
- EPSRC [EP/J019763/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J019763/1] Funding Source: researchfish
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Methodology for analysis of meso-structure effects on longer-scale mechanical response of concrete is developed. Efficient algorithms for particle generation and packing are proposed to represent 3D meso-structures as collections of discrete features distributed randomly in a continuous phase. Specialised to concrete, the continuous phase represents mortar, while the features are aggregates and voids. Intra- and inter-phase cohesive zones are used for failure initiation and crack propagation. A Monte Carlo approach is proposed to analyse the effects of meso-structure geometrical (volume density, size distribution and shape of features) and physical (strength and energy of cohesive zones) properties, whereas a number of model realisations with identical properties are used for statistical analysis. The results present the relative significance of each meso-structure parameter for the emergent load capacity (tensile strength), damage evolution via micro-crack coalescence and macro-crack patterns, and failure energy density (toughness) of concrete. The proposed methodology is an effective tool for meso-structure optimisation in the design of concrete structures with prescribed requirements for strength and toughness. (C) 2015 The Authors. Published by Elsevier Ltd.
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