Application of carbon fiber reinforced polymer laminate for strengthening reinforced concrete T-beam /Muhammad Mukhlesur Rahman
Most of the researches on strengthening so far had been focused on rectangular reinforced concrete (RC) beams. Researches on strengthening of RC T-beams are rather limited. This study focuses on the application of carbon fibre reinforced polymer (CFRP) laminate for strengthening the tension zone...
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| Format: | Thesis |
| Published: |
2012
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| Online Access: | http://studentsrepo.um.edu.my/8816/4/MEngSc_Thesis_KGA_090034_Muhammad_Mukhlesur_Rahman.pdf http://studentsrepo.um.edu.my/8816/ |
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| Summary: | Most of the researches on strengthening so far had been focused on rectangular
reinforced concrete (RC) beams. Researches on strengthening of RC T-beams are rather
limited. This study focuses on the application of carbon fibre reinforced polymer
(CFRP) laminate for strengthening the tension zone of RC T-beam constrained by the
presence of a stump (representative of a column) and the effect of varying the length of
the strengthening laminates. Three different orientations of the CFRP laminates were
tested to evaluate the best orientation. The behaviour of RC T-beams (with stump)
flexurally strengthened both in tension and compression zones were also studied here.
In addition, FEM (non-linear finite element analysis) was applied to model the
experimental results.
To evaluate the effectiveness of the proposed strengthening method, a total of eight RC
T-beams were fabricated and tested. Four of them were cast with a column stump in the
midspan to provide constraints for the application of CFRP laminates. The other four
beams were cast without any column stump. The following orientations were chosen.
Orientation 1 was the full application of CFRP laminate along the centre of beam length
assuming no stump was present. Orientation 2 was the full application of CFRP
laminate alongside the stump parallel to beam length and Orientation 3 was the
application of CFRP laminate around the stump and a continuous strip from the side of
the stump to the ends of the beam. The beams were tested using the three point bending
test set-up.
The results showed that the load carrying capacities of the tension zone strengthened
beams were increased by about 50% compared to un-strengthened beams. The length of
the CFRP laminate recommended in the Technical Report 55 did not prevent end
peeling but it did increase the load bearing capacity of the RC T-beam. The most suitable orientation of CFRP laminate determined was Orientation 2. The load carrying
capacity had increased by about 70% compared to un-strengthened beam by
strengthening both the tension and compression zone. The FEM analyses were in good
agreement with the experimental results.
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