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|Title: ||Behaviour of R.C. beams upgraded with externally bonded steel or FRP plates|
|Authors: ||Hassanen, Mahmoud A.H.|
|Keywords: ||Plate peeling failure|
|Issue Date: ||2000|
|Publisher: ||© Mahmoud Abdel Hamed Hassanen|
|Abstract: ||The structural behaviour of simply supported reinforced concrete (R.C.) beams
strengthened in flexure by externally bonded steel or fibre reinforced plastic (FRP)
plates has been investigated. A novel theoretical model coupled with simple (hence,
practical) procedure(s) for designing such beams against premature plate peeling failure
has been developed. The theoretical model and the design procedures have been
validated by an extensive number (169) of mainly large-scale test data (using steel or
FRP plates) from other sources. The effects of variations in the magnitude of Young's
modulus for FRP plates on the potential changes in the flexural ultimate load of R. C.
beams with externally bonded FRP plates, in the absence and/or presence of plate
peeling, have been investigated in some detail with the theoretical predictions of
various failure loads and associated modes of failure supported by an extensive number
of test results from other sources. Moreover, brief theoretical parametric studies for
other first order composite beam design parameters have also been carried out in order
to clarify the effects of variations in such parameters on the predicted modes of failure.
It has been shown (both, theoretically and by using large scale experimental data) that
the load bearing capacity for a plated beam could (under certain circumstances) be
significantly lower than even that for the corresponding unplated beam with the mode
of failure being of an undesirable brittle nature. Such brittle failures can obviously have
serious implications in practice, where this method has been used extensively for
upgrading both bridges and buildings in a number of countries, with the design
calculations very often not having properly accounted for the possible occurrence of
premature plate peeling phenomenon, especially when FRP plates have been used.
Further work in this area included a quantitative theoretical insight into the effect of
pre-cracking of the beams (under service conditions) on the ultimate plate peeling load.
A critical quantitative examination of a number of previously available theoretical
models, as proposed by others, has also been carried out, and some of these models for
predicting the plate peeling failure of R. C. beams have been shown to suffer from
rather serious shortcomings.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Architecture, Building and Civil Engineering)|
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