This paper provides results of an investigation aimed at assessing the effect of deterioration over time, at the materials level, on the effectiveness of fiber reinforced polymer (FRP) jacket used for seismic retrofit. Three different systems are investigated and results from an accelerated test program are used to provide predictive equations of long-term performance of the material, which are then used to analyze effectiveness at the level of seismic retrofit. The effect of deterioration is expressed, for ease in comparison, to an increase in the required thickness of the jacket for the required level of service-life. The use of the proposed methodology is shown to not only enable a better assessment of jacket design but to also allow for assessment of dominant mechanisms controlling selection of thickness which can change with time of exposure. It is demonstrated that for the case of seismic retrofit the use of current ACI-440 durability factors could be overly conservative.
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