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Title |
Improvement of Concrete Compressive Strength Evaluation Method for Safety Assessment of Existing Structures
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Authors |
박자민(Jamin Park) ; 권승희(Seung-Hee Kwon) ; 송호민(Homin Song) ; 최정욱(Jung-Wook Choi) ; 김형기(Hyeong-Ki Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.2.211 |
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Keywords |
기존 콘크리트 구조물; 압축강도 평가입력값; 비파괴시험; 코어 공시체; 구조물 안전성 평가 existing concrete structures; compressive strength evaluation; nondestructive testing (ndt); core specimen; structural safety assessment |
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Abstract |
This study proposes an improved framework for evaluating the compressive strength of existing concrete structures to enhance the accuracy of structural safety assessments. Current domestic and international standards often lack clear procedures or fail to account for realistic site constraints, frequently resulting in underestimations of concrete strength. To address these issues, this research presents three practical evaluation approaches: (1) a regression-based estimation method combining core testing with nondestructive testing (NDT); (2) a minimum-value-based evaluation incorporating a statistical correction factor for cases with a limited number of core specimens; and (3) a conservative estimation method for NDT-only scenarios using a reduction multiplier to account for uncertainty. Furthermore, this study provides explicit guidelines regarding the selection of test locations and the acceptance of small-diameter core specimens thereby aligning domestic practices with EN and JCI standards. Case studies on actual structures demonstrated that the proposed framework effectively mitigates the over-conservatism of existing KDS codes while providing reliable and stable characteristic strength values that reflect field conditions.
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