The onset and evolution of bar buckling at the plastic hinge of old-type reinforced concrete
(RC) columns confined with composite material [fiber reinforced polymer (FRP) and textilereinforced
mortar (TRM)] jackets was investigated experimentally and analytically in this
study. The interaction between composite jacket (or concrete cover, for unconfined concrete)
and embedded longitudinal compression reinforcement at the onset and evolution of bar
buckling was achieved through strain measurements of the compression reinforcement.
Moreover the implementation of a recent stress-strain confinement model, which relates
lateral with axial strains, allowed the description and monitoring of the axial-lateral strain
relationship at the base of the columns throughout the evolution of bar buckling. Based on
the aforementioned model and the experimental measurements, the post-buckling behavior of
columns was related to the jacket stiffness. Finally, a semi-empirical expression, which gives
the drift ratio of RC columns at the onset of bar buckling, was modified herein for the case of
FRP or TRM jacketed columns.
BOURNAS Dionysios;
TRIANTAFILLOU Thanasis;
2011-07-19
ASCE-AMER SOC CIVIL ENGINEERS
JRC63236
1090-0268,
https://publications.jrc.ec.europa.eu/repository/handle/JRC63236,
10.1061/CC.1943-5614.0000180,
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