Size effect in confined concrete

Title: Size effect in confined concrete
Creator: Attard, Mario; Samani, Ali Khajeh
Date: 2010
Type: Text; Conference paper
Identifier: http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/162408
Identifier: vital:12680
Abstract: Compressive size effect tests have been mainly conducted on uniaxial compression tests. However, softening in concrete happens not only in uniaxial compression but also under triaxial compression. The present study shows that the post-peak compressive fracture energy per unit area, is influenced by the level of confinement in triaxial loading. The results estimated from the literature show an increasing fracture energy with increasing confinement until a limit is reached, at a confinement ratio of about 10 to 20% after which it decreases until it becomes zero. The fracture energy, the specimen height, aspect ratio and the confinement level is shown to influence the softening behavior of both uniaxially and triaxially loaded concrete. A new stress strain model is proposed for unconfined and confined concrete. The proposed model takes account of size effects dependent on specimen height and aspect ratio. The model is compared to experimental data and shows excellent agreement.
Relation: 21st Australasian Conference on the Mechanics of Structures and Materials p. 221-226
Rights: This metadata is freely available under a CCO license
Subject: 0905 Civil Engineering
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