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Shear strengthening of RC T-section beams with low strength concrete using NSM CFRP laminates

The effectiveness of NSM technique with CFRP laminates for the shear strengthening of T-section RC beams of low strength concrete was assessed. Five NSM shear strengthening configurations (three CFRP orientations and two levels of CFRP percentage) were applied in RC beams with a steel stirrups perce...

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Published in:Cement & concrete composites 2011-02, Vol.33 (2), p.334-345
Main Authors: Dias, S.J.E., Barros, J.A.O.
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Language:English
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cited_by cdi_FETCH-LOGICAL-c433t-2ed9d1e095e796b8b3330f430f4619fc4bf0be7aa061700ac1231aba1a98f7033
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description The effectiveness of NSM technique with CFRP laminates for the shear strengthening of T-section RC beams of low strength concrete was assessed. Five NSM shear strengthening configurations (three CFRP orientations and two levels of CFRP percentage) were applied in RC beams with a steel stirrups percentage of 0.10% and of 0.17%. The results showed that: NSM technique is still effective in beams of low strength concrete; inclined are more effective than vertical laminates; the beam’s shear resistance increases with the CFRP percentage; the NSM strengthening effectiveness decreases with the increase of the steel stirrups percentage. Using available experimental results obtained with the same test set-up but using beams of higher strength concrete it can be concluded that the NSM technique is less effective for lower concrete strengths. In general, the formulation proposed by Nanni et al. provided safe and acceptable estimates for the contribution of the NSM shear strengthening systems. The predicted values of the CFRP contribution for the shear resistance were 75% of the results registered experimentally.
doi_str_mv 10.1016/j.cemconcomp.2010.10.002
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source ScienceDirect Freedom Collection 2022-2024
subjects Beams (structural)
Carbon fiber reinforced plastics
CFRP laminates
Concretes
Laminates
Low strength concrete
NSM
Reinforced concrete
Reinforcing steels
Shear
Shear strengthening
Strength
Strengthening
T cross section RC beams
title Shear strengthening of RC T-section beams with low strength concrete using NSM CFRP laminates
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