Abstract
An investigation was conducted into the flexural behavior of earthquake-damaged
reinforced concrete columns repaired with prefabricated fiber reinforced
plastic (FRP) wraps. Four column specimens were tested to failure
under reversed inelastic cyclic loading to a level that can be considered
higher than would occur in a severe earthquake. The columns were
repaired with prefabricated FRP wraps and retested under simulated
earthquake loading. The test specimens were designed to model single-bent,
nonductile concrete columns in existing highway bridges constructed
before the modern seismic design provisions were in place. FRP composite
wraps were used to repair damaged concrete columns in the critically
stressed areas near the column footing joint. The physical and mechanical
properties of FRP composite wraps are described. Seismic performance
of repaired columns in terms of their hysteretic response is evaluated
and compared to those of the original and unretrofitted columns.
The results indicate that the proposed repair technique is highly
effective. Both flexural strength and displacement ductility of repaired
columns were higher than those of the original columns.
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