This paper describes the seismic performance evaluation of reinforced concrete bridge columns under constant and varying axial forces. For this purpose, nine identical circular reinforced concrete columns were designed seismically by KIBSE (2021) and KCI (2021). A comparison of lateral forces with theoretical strength shows that the safety factor for columns under varying axial forces is less marginal than those under constant axial forces. In addition, columns under varying axial forces exhibit significant fluctuations in the hysteretic response due to continuously varying axial forces. This is particularly prominent when many varying axial force cycles within a specific lateral loading cycle increase. Moreover, the displacement ductility of columns under varying axial forces does not meet the code-specified required ductility in the range of varying axial forces. All varying axial forces affect columns' strength, stiffness, and displacement ductility. Therefore, axial force variation needs to be considered in the lateral strength evaluation of reinforced concrete bridge columns.

1. 서 론
2. 실험계획 및 방법
    2.1 실험계획
    2.2 실험방법
3. 실험결과
    3.1 손상상태
    3.2 횡하중-변위 이력 응답
    3.3 횡하중 강도
    3.4 변위연성도
4. 결 론

• 이도형(배재대학교 드론․철도건설공학과 교수) | Lee, Do Hyung (Professor, Department of Civil, Railroad and Unmanned Systems Engineering, PaiChai University) Corresponding author