CFRP strengthened openings in two-way concrete slabs: - An experimental and numerical study

O. Enochsson, J. Lundqvist, Björn Täljsten, Piotr Michal Rusinowski, T. Olofsson

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Abstract

Rehabilitation and strengthening of concrete structures with externally bonded fibre reinforced polymers (FRPs) has been a viable technique for at least a decade. An interesting and useful application is strengthening of slabs or walls where openings are introduced. In these situations, FRP sheets are very suitable, not only because of their strength, but also due to that they are easy to apply in comparison to traditional steel girders or other lintel systems. Even though many benefits have been shown by strengthening openings with FRPs not much research have been presented in the literature. In this paper, laboratory tests on I I slabs with openings, loaded with a distributed load are presented together with analytical and numerical evaluations. Six slabs with openings have been strengthened with carbon fibre reinforced polymers (CFRPs) sheets. These slabs are compared with traditionally steel reinforced slabs, both with (four slabs) and without openings (one slab). The slabs are quadratic with a side length of 2.6 in and a thickness of 100 mm. Two different sizes of openings are used, 0.85 x 0.85 in and 1.2 x 1.2 m. The results from the tests show that slabs with openings can be strengthened with externally bonded CFRP sheets. The performance is even better than for traditionally steel reinforced slabs. The numerical and analytical evaluations show good agreement with the experimental results. (c) 2006 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalConstruction and Building Materials
Volume21
Issue number4
Pages (from-to)810 - 826
ISSN0950-0618
Publication statusPublished - 2006

Cite this

Enochsson, O., Lundqvist, J., Täljsten, B., Rusinowski, P. M., & Olofsson, T. (2006). CFRP strengthened openings in two-way concrete slabs: - An experimental and numerical study. Construction and Building Materials, 21(4), 810 - 826.