In this paper, seismic performance evaluation was carried out for eight circular reinforced concrete columns designed seismically by KRTA[1]and KCI[8]. Primary design parameters for such columns included many longitudinal reinforcements, yield strength of reinforcements, the vertical spacing of spirals, aspect ratio, and axial force ratio. The test results showed that all the columns exhibited stable hysteretic and inelastic responses. Based on the test results, drift ratios corresponding to each damage state, such as initial yielding, initial cover spalling, initial core concrete crushing, buckling, and fracture of longitudinal reinforcement and final spalled region, were evaluated. Then, those ratios were compared with widely accepted damage limit states. The comparison revealed that the existing damage states were considerably conservative. This implies that additional research is required for the damage limit states of such columns designed seismically by current Korean design codes.

A B S T R A C T
1. 공학적 손상한계상태의 필요성
2. 실험계획 및 방법
    2.1 실험계획
    2.2 실험방법
3. 실험결과 정리 및 분석
    3.1 손상상태
    3.2 균열 양상 및 초기 항복
    3.3 콘크리트 피복 박리 및 구속콘크리트 파쇄
    3.4 횡하중-변위 이력응답
    3.5 횡하중 강도
4. 변위연성도
    4.1 항복 및 극한변위 정의
    4.2 변위연성도
5. 결 론
감사의 글
REFERENCES

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