Resumo

FANOURAKIS, G C. Validation of international concrete creep prediction models by application to South African concretes. J. S. Afr. Inst. Civ. Eng. [online]. 2011, vol.53, n.2, pp.23-30. ISSN 2309-8775.

Creep deformation of concrete is often responsible for excessive deflections at service loads which can compromise the performance of a structure. National design codes therefore provide prediction models for the estimation of creep deformation. These models are empirical-based. This paper assesses the accuracy of six international code type models, when compared with the actual strains measured on a range of South African concretes under laboratory control conditions. The models considered are those contained in AS 3600 (2001), AS 3600 (2009), Eurocode EC 2 (2004), GL (2000), GL (2004) and GZ (1993). The results indicate that for the range of concretes tested, the GL (2000) model yielded the most accurate predictions, giving the lowest overall coefficient of variation (ω_all) of 31,9%. The least accurate method was the AS 3600 (2009) which yielded an overall coefficient of variation (ω_all) of 74,7%. This paper also recommends a new approach to assessing the accuracy of creep models.

Palavras-chave : concrete; creep; models; design codes; testing.

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