The experimental results on full-scale corner beam-column joints tests are
presented herein, with the aim of studying the effectiveness in
strengthening existing RC existing structures of the application of a
HPFRC jacket.
The specimens subassemblies have been designed with structural
deficiencies typical of the Italian construction practice of the
60’s-70’s: absence of any capacity design principle, use of smooth bars,
inadequate reinforcement detailing, such as total lack of stirrups in the
joint panel and hook-ended anchorage.
Both unretrofitted and retrofitted specimens have been tested under
simulated seismic loads.
The results underline the significant vulnerability of the joint panel
region and the critical role of the slippage phenomena related to the use
of smooth bars and show that, with the application of a HPFRC jacket, it
is possible to increase the bearing capacity of the columns, reaching also
an adequate level of ductility and strength of the beam column joints.