Inproceedings,

Peeling failure of reinforced concrete beams with fibre-reinforced plastic or steel plates glued to their soffits

, and .
Proceedings of the Institution of Civil Engineers, Structures and Buildings (UK), 140, page 291-305. (August 2000)

Abstract

n recent publications by the first author and his associates, a theoretical model (backed by extensive test data by others) for premature plate peeling failures of reinforced concrete beams strengthened in flexure by gluing steel plates to their tension sides was reported. The primary purpose of the present paper is to extend this theoretical model to cases where fibre-reinforced plastic (FRP) (as opposed to steel) plates are used for upgrading reinforced concrete beams in fiexure. As in the case of steel, due to large variations in the spacings of stabilized cracks within the concrete cover zone (by a factor of, say, 2) a unique solution for the FRP plate peeling load does not exist, and one needs to resort to theoretical upper/lower bounds, with the lower bound being the appropriate one for design purposes. Finally, with the theoretical predictions for FRP and steel-plated beams backed by nearly 170 (mainly large-scale) test results from a number of independent sources, covering a wide range of beam design parameters, the proposed model is thought to be reliable and generally applicable.

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