Bar Buckling in RC Columns Confined with Composite Materials

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,