الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Reinforced concrete structures may be deteriorated after certain time and the structural
elements required for strengthening due to the environmental factors, increasing of
service loads and errors in design, mechanical damage or needs to increase the structure
performance more than the initial performance that the structure was designed on it. It’s
very important to choice or develop the effective method for repairing or strengthening
deteriorated structures to reduce the future maintenance cost while extending their
service life. The main objectives of this study are to the deeply understand the flexural
behavior of un-bonded post-tensioned reinforced concrete (UPRC) beams strengthened
with non-pre-stressed NSM bars and the effectiveness of NSM strengthening technique
and also needs to support on rigorous studies by reliable data to be used to propose
design and prediction methods. An experimental program was carried out on eight unbonded
post-tensioned reinforced concrete beams casted with M40 grade concrete to
investigate the effect of carbon fibre reinforced polymers (CFRP) bars and high tensile
strength (HTS) steel bars with different numbers and diameters in flexural strengthening
using near surface mounted technique. Three dimensional nonlinear finite element
analysis was performed up to failure considering the nonlinear effect of materials to
investigate the nonlinear behavior of tested post-tensioned reinforced concrete beams
in addition to perform a parametric study to investigate the flexuralbehavior of (UPRC)
beam specimens with different concrete grades. The experimental and analytical results
are presented, compared and discussed. The proposed models in the analysis show a
good results that agree with the experimental test results.