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Abstract
nowadays, many of old buildings and infrastructures - like bridges - become
structurally insufficient to carry the new loading conditions requirement and also suffer
from structural degradation due to experience a lot of loading levels, reinforcement steel
bars corrosion, bad weather conditions, ..... etc. A lot of official authorities in several
countries had recognized a lot of old bridges and buildings as structurally deficient by
today’s standards.
With respect of these reasons, structural strengthening becomes an essential
requirement; hence, many strengthening techniques appear in market. Due to the large
amount of these deficient buildings and limitation in funds, and also time limitation
because lot of these bridges are vital for national transportation strategy, consequently,
Fiber Reinforced Polymer (FRP) strengthening techniques establish a good stature between
all other techniques; give an excellent structural results, low time required and moderated
cost compared with the other techniques.
The main purpose of this research is to study analytically using Finite Element
Method - ANSYS computer program - the strengthening of a simple reinforced concrete
beams due to excessive uniform loads in flexure, shear and a combination of flexure and
shear, using externally bonded FRP sheets technique. A summary of research work done
by the others was conducted in literature review chapter clarifying the different FRP
schemes, behavior of the strengthened beams and discuss the different failure modes.
A commercial Finite Element Program ANSYS was used to perform a structural
linear analysis and Non-linear analysis for a several models with several schemes of FRP
sheets. .
A parametric study was performed for a lot of strengthened using different schemes
of externally bonded carbon fiber reinforced polymer (CFRP) sheets in flexure, shear and
combination of flexure and shear strengthening. Comparing the results with a control beam
model - simple reinforced concrete beam without strengthening - it is obviously shown
that all strengthened beams have a greater ultimate capacity than the control beam and
noticeable enhancement in member toughness, the increasing level differ as a result of the
strengthening scheme, the strengthened beam in flexure using CFRP sheets externally
bonded to the beam soffit and strengthened in shear using wrapped CFRP jackets gives the
higher ultimate load capacity, and delay the failure. A lot of different schemes was
experienced and the results are obtained in the parametric study chapter.