Moment redistribution in CFRP strengthened concrete t-beams: an experimental study

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Moment redistribution in FRP flexurally strengthened continuous reinforced concrete structures is often not allowed (or is limited) in design guidance documents. This is due to the elastic-brittle nature of CFRP composite materials and their propensity to prematurely debond from the concrete surface, resulting in a reduction in the associated ductility of the strengthened concrete section. However, there is still a possibility that some redistribution can occur if sufficient rotation capacity can develop. In this study, the moment redistribution capacity of FRP strengthened RC T-beams was examined by testing 6 two-span continuous specimens. The specimens were designed to have 30% redistribution capacity before FRP strengthening. Different internal steel arrangements as well as various FRP strengthening configurations and anchoring schemes were investigated for each specimen. The experimental results demonstrated that a high amount of moment redistribution could be achieved into FRP-strengthened zones, with little restriction, while the degree of moment redistribution out of FRP-strengthened zones is highly dependent on the quantity and anchorage of the CFRP composite materials, although some limited but significant moment redistribution is generally still possible.


ConferenceThe 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & The 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015); joint conference; December 14-16, 2015;


  • Moment redistribution; CFRP plate; NSM tape; Concrete T-beams


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