Abstract
An experimental study was conducted to examine the seismic behavior of reinforced concrete columns strengthened with fiber reinforced plastic (FRP) composite straps. Five concrete column-footing assemblages were constructed with a one-fifth--dimensional scale factor. The unidirectional glass fabric straps were impregnated with polyester resin and wrapped around the potential plastic hinge zone of the columns. An epoxy layer was applied to the straps while wrapping for interlaminar bond. All specimens were tested under inelastic reversal loading while simultaneously subjected to a constant axial load. Experimental findings reveal that the seismic resistance of retrofit concrete columns improves significantly due to the confining action of the FRP composite straps. The straps are highly effective in confining the core concrete and preventing the longitudinal reinforcement bars from buckling under cyclic loading.
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