2025 Volume 81 Issue 14 Article ID: 24-14008
Seismic retrofitting of steel bridges typically involves the use of steel plates to strengthen the structure. This method has problems such as loss of cross-section of the base material due to bolt holes, increase in dead weight, and re-deterioration. To solve these problems, it is effective to use carbon fiber reinforced polymer (CFRP) for reinforcement, which is lightweight and does not corrode. In this study, we conducted monotonic and cyclic loading tests on long rectangular section specimens made of steel truss bridge members and verified the seismic reinforcing effect of CFRP sheets. As a result, it was confirmed that CFRP reinforcement can be expected to improve the load-carrying capacity even under cyclic loading, and that the amount of energy absorbed does not suddenly decrease even after local buckling occurs. In addition, the experimental results were on the safe side of the load-carrying curve, and it was found that it was possible to incorporate the reinforcing effect of CFRP into the design by using the existing load-carrying curve.
