The role of material fabric in concrete under uniaxial compression

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:226

Article

Ghosh, Subha¹  Deb, Arghya¹ 

[1] Indian Inst Technol Kharagpur, Dept Civil Engn, Kharagpur 721302, W Bengal, India

关键词: Material fabric;    Fabric anisotropy;    Stress-fabric relation;    Meso geometry;    Discrete element analysis;   

DOI  :  10.1016/j.ijsolstr.2021.111079

来源: Elsevier

【 摘 要 】

The paper extends the formal structure of the fabric based analysis of cohesion-less granular materials to cemented granular materials such as concrete. The stress-fabric and strain-fabric relationships are derived, and both are seen to be sensitive to particle angularity and maximum particle size. The contributions of the isotropic and anisotropic parts of the micro structural stress and strain are identified and a recently developed discrete element capability used to investigate their separate contributions to the macro behaviour in uniaxial compression. The anisotropic part of the micro-structural stress plays a dominant role in determining the peak strength. However, post peak ductility is largely controlled by the isotropic part. Remarkably fabric anisotropy, which depends strongly on particle angularity, is seen to result in higher hydrostatic pressures. This strengthens the internal confinement mechanism and accounts for the superior strength of specimens with angular aggregates observed in experiments. (c) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

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