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The need of a unified method for strength and ductility analysis of strengthened concrete columns

The need of a unified method for strength and ductility analysis of strengthened concrete columns
The need of a unified method for strength and ductility analysis of strengthened concrete columns
The current paper reports selected findings from a research programme is being carried out at the United Southampton into the fundamental understanding of the effectiveness of FRP confinement, when applied to circular concrete columns as a means of improving strength and ductility. The paper shows that the predictions from the empirical formulae-based design guidelines recommended by The Concrete Society Technical Report No. 55 (the most widely used design standard in the UK) and ACI 440.2R-02 (the most widely used design standard in the USA) are unreliable. By comparing the predictions from the two design recommendations for a database of test results extracted from the published literature, the paper shows that the formulae do not provide correct results. The models do not effectively take into account of differences in the confinement provided by FRP jackets in large columns. Similarly, the less effective confinement exerted in high strength concrete, reduction in the rupture strain of thick (stiff) FRP jackets, effects due to the height / diameter ratio of the column cannot be incorporated into the models. In particular, the paper shows that although the predictions form the models agree well with the test results used to derive the original empirical formulae they do not provide accurate predictions for the failure load of new test specimens.
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Sotira, G.
86e2fec7-f45f-4062-b233-044a2ba25e80
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Sotira, G.
86e2fec7-f45f-4062-b233-044a2ba25e80

Achintha, M. and Sotira, G. (2013) The need of a unified method for strength and ductility analysis of strengthened concrete columns. 6th International Conference on Advanced Composites in Construction (ACIC2013), United Kingdom. 10 - 12 Sep 2013. 12 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The current paper reports selected findings from a research programme is being carried out at the United Southampton into the fundamental understanding of the effectiveness of FRP confinement, when applied to circular concrete columns as a means of improving strength and ductility. The paper shows that the predictions from the empirical formulae-based design guidelines recommended by The Concrete Society Technical Report No. 55 (the most widely used design standard in the UK) and ACI 440.2R-02 (the most widely used design standard in the USA) are unreliable. By comparing the predictions from the two design recommendations for a database of test results extracted from the published literature, the paper shows that the formulae do not provide correct results. The models do not effectively take into account of differences in the confinement provided by FRP jackets in large columns. Similarly, the less effective confinement exerted in high strength concrete, reduction in the rupture strain of thick (stiff) FRP jackets, effects due to the height / diameter ratio of the column cannot be incorporated into the models. In particular, the paper shows that although the predictions form the models agree well with the test results used to derive the original empirical formulae they do not provide accurate predictions for the failure load of new test specimens.

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More information

Published date: 12 September 2013
Venue - Dates: 6th International Conference on Advanced Composites in Construction (ACIC2013), United Kingdom, 2013-09-10 - 2013-09-12
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 369125
URI: https://eprints.soton.ac.uk/id/eprint/369125
PURE UUID: d3c599b8-ca5b-4820-b441-7e20dd57c38c
ORCID for M. Achintha: ORCID iD orcid.org/0000-0002-1732-3514

Catalogue record

Date deposited: 25 Sep 2014 13:55
Last modified: 13 Jun 2019 00:32

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