철근 부식된 철근콘크리트 휨 및 전단보의 복원력특성에 관한 실험적연구

초록

It is critically important to investigate how the seismic performance of reinforced concrete members damaged by reinforcement steel corrosion affects the whole seismic capacity of structures. Based on such studies, the seismic capacity of reinforced concrete structures containing corroded reinforcement members, including beams, walls and columns, can be evaluated more accurately. However, existing seismic evaluation guidelines for reinforced concrete structures, including FEMA 310 in the United States and the Japanese standards for seismic capacity evaluation of reinforced concrete structures, do not account for deterioration effects, including reinforcement steel corrosion, in evaluating the seismic capacity of reinforced concrete members. Furthermore, even though previous analytical and experimental researches on corroded reinforced concrete structures have stated quantitative deterioration in strength-deformation capacity, there has been very limited research on the hysteretic behavior of such members based on their strength and deformation capacity resulting from the corroded reinforcement. In conclusion, the seismic capacity of reinforced concrete members with corrosion damages should be must be quantitatively by considering the deterioration in seismic capacity based on load–displacement performance, i.e., hysteretic behavior. The ultimate objective of this study is to propose a practical methodology for evaluating the seismic performance of R/C structures containing corroded members, specifically through a hysteretic model based on load–displacement characteristics at the crack, yield, and ultimate states of corrosion members. As a first step, to investigate the influences of reinforcement steel corrosion on the load-displacement behavior of reinforced concrete beams, beams controlled by shear and flexure were designed and fabricated with varying corrosion levels using an accelerated corrosion method based on impressed current. Finally, monotonic loading tests were conducted to evaluate the load–displacement characteristics at the crack, yield, and ultimate states of the corroded beams controlled by shear and flexure.

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