Due to the limited experimental data on the seismic performance of concrete-encased steel columns, standardized guidelines for nonlinear modeling parameters and acceptance criteria have not yet been developed. This study utilized analytical and numerical methods to predict the nonlinear behavior of concrete-encased steel columns with H-shaped steel sections. The findings of this study have direct and practical implications for the design and evaluation of concrete-encased steel columns. For instance, for concrete-encased steel columns constructed with normal-strength concrete and subjected to low-to-moderate axial load ratios, the yield rotation angle can be determined through fiber-based section analysis and analytical equations, and the nonlinear modeling parameter can be evaluated based on section analysis and the proposed empirical equation. For concrete-encased steel columns with high-strength concrete or high axial load ratios, inconsistencies between section analyses and experimental results are observed. Accordingly, the nonlinear modeling parameter a can be evaluated using the proposed empirical equation. The empirical equation was conservatively developed based on the modeling parameter criteria for reinforced concrete columns in ASCE 41-13.

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1. 서 론
2. 실험 데이터 수집 및 기존 연구 분석
    2.1 실험 데이터 수집
    2.2 실험변수 분석
    2.3 기존 제안식과의 비교
3. 단면해석
    3.1 재료 모델
    3.2 단면해석(Section Analysis)
    3.3 전단변형 및 미끄러짐 변형의 고려
    3.4 실험결과와의 비교
4. 비선형 모델링 파라미터 제안
    4.1 Group A (축력비 0.4 미만인 보통강도 콘크리트 실험체)
    4.2 Group B(축력비 0.4이상 혹은 고강도 콘크리트 실험체)
    4.3 비선형 모델링 파라미터 경험식 제안
5. 결 론
/ 감사의 글 /
/ REFERENCES /

• 유은종(한양대학교 건축공학과 교수) | Yu Eun Jong (Professor, Department of Architectural Engineering, Hanyang University) Corresponding author
• 김승현(한양대학교 건축공학과 석사과정) | Kim Seung Hyun (Graduate Student, Department of Architectural Engineering, Hanyang University)