Abstract
The use of fiber reinforced polymer (FRP) confinement techniques to repair partially encased composite (PEC) columns can prevent outward local buckling and corrosive damage in their flange plates. This study investigated the effects of three different carbon FRP (CFRP) strengthening schemes (including hoop, longitudinal, and bidirectional combined bonding of CFRP) on the axial compressive behavior of PEC columns with varying slenderness ratios. Fifteen specimens were tested to analyze their failure modes, bearing capacities, load-deflection responses, and load-strain responses. The results show that CFRP hoop wraps effectively enhance the strength of short columns. Longitudinal bonding of CFRP significantly improves the flexural stiffness of slender columns. Optimal load-bearing capacity enhancement can be achieved through the synergistic effect of bidirectional combined bonding of CFRP. A simplified calculation formula for the axial load bearing capacity of CFRP-confined PEC columns was also proposed, which shows a good agreement with the experimental results.
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