정착 방법에 따른 TRM 보강 보의 휨 거동에 관한 연구

초록

In this study, anchor bolt and U-jacket anchorage methods were implemented to prevent debonding between the TRM reinfrocement and the concrete substrate, and the flexural performance of TRM-strengthened beams was compared according to the anchorage method. Experimental results confirmed that TRM strengthening is most effective near the yielding stage, and thus the yielding stage was defined as the strengthening limit state by synthesizing the results of this study with previous research findings. The flexural performances depending on anchorage configuration were evaluated at this strengthening limit state. No debonding was observed in beams strengthened with either anchor bolts or U-jackets. For beams without preloading, TRM-strengthened beam anchored the anchor-bolt exhibited approximately 11% higher flexural capacity than the U-jacket. When preloading was considered, the performance difference between the two anchorage methods was reduced. However, TRM-strengthened beams anchored the anchor bolt still demonstrated a 6% higher flexural capacity. Additionally, the incorporation of anchorage effectively prevented the reduction in strengthening efficiency caused by preloading. It was also verified that TRM strengthening provides effective flexural enhancement when applied to beams with damage levels below 80% of the yield load.

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