Shear resistance of RC members with closed FRP jacket for Eurocode 8

The shear resistance computed using Annex J of Part 1–1 of Generation 2 of Eurocode 2—on strengthening of RC members for static loads with externally-bonded Fibre-reinforced-polymers (FRPs)—exceeds by about 25% on average the cyclic shear resistance of 64 FRP-jacketed shear-critical RC specimens in...

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Bibliographic Details
Published in:Bulletin of earthquake engineering 2024-10, Vol.22 (13), p.6359-6377
Main Authors: Biskinis, Dionysis, Fardis, Michael N.
Format: Article
Language:English
Subjects:
Bonding strength
Building codes
Civil Engineering
Concrete
Cyclic loads
Cyclic testing
Earth and Environmental Science
Earth Sciences
Earthquakes
Environmental Engineering/Biotechnology
Fiber reinforced plastics
Fiber reinforced polymers
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Original Article
Piled platforms
Polymers
Seismic design
Shear
Shear strength
Static loads
Structural Geology
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Summary:The shear resistance computed using Annex J of Part 1–1 of Generation 2 of Eurocode 2—on strengthening of RC members for static loads with externally-bonded Fibre-reinforced-polymers (FRPs)—exceeds by about 25% on average the cyclic shear resistance of 64 FRP-jacketed shear-critical RC specimens in the international literature. The semi-empirical cyclic shear resistance approach for FRP-wrapped RC members in Annex A of Part 3 of Generation 1 of Eurocode 8 is in good average agreement with the results of these tests, but conflicts with the rational, mechanics-based approach for shear resistance against static actions in Generation 2 of Eurocode 2, which has already been adopted in Generation 2 of Eurocode 8 for members without FRP jackets, adapted to the specific needs of seismic design. This latter approach is modified and extended to cover RC members with closed FRP jackets in a more technically sound way than in Annex J of Generation 2 of Eurocode 2. The new approach fits the available cyclic test results without bias or lack-of-fit with respect to the key variables controlling cyclic shear resistance, gives slightly better accuracy than the semi-empirical one in Generation 1 of Eurocode 8 and does much better in correctly identifying as not failing in shear FRP-wrapped RC members which have failed in flexure or not failed at all during cyclic testing.
ISSN:1570-761X
1573-1456
DOI:10.1007/s10518-024-02000-0