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ISSN : 1226-525X(Print)
ISSN : 2234-1099(Online)
Journal of the Earthquake Engineering Society of Korea Vol.30 No.2 pp.59-68
DOI : https://doi.org/10.5000/EESK.2026.30.2.59

A Proposed Method for Tensile Strength Evaluation of Anchor With Anchor Reinforcement

Park Jin-Young1)*, An Gyeonghee2), Park Junhee3)
1)Postdoctoral Researcher, Structural and Seismic Research Division, Korea Atomic Energy Research Institute (KAERI), 2)Senior Researcher, Structural and Seismic Research Division, Korea Atomic Energy Research Institute(KAERI), 3)Principal Researcher, Structural and Seismic Research Division, Korea Atomic Energy Research Institute (KAERI)

Abstract

The tensile performance of anchors strongly influences the seismic safety of nuclear power plant equipment, as tensile failure of anchors has been identified as a governing failure mode in seismic fragility assessments. To improve the reliability of tensile-strength evaluation, this study examines existing design codes and research-based models by comparing them with experimental data. Design codes generally yield conservative estimates because they give limited consideration to anchor reinforcement. In contrast, research-based models provide a more accurate representation of load-sharing behavior between concrete breakout and anchor reinforcement but require relatively complex calculations for practical design applications. Based on experimental observations, a simplified method for evaluating tensile strength is proposed. The proposed method evaluates the combined resistance of concrete breakout and anchor reinforcement yielding or bond failure. Seismic fragility analysis results indicate that methods incorporating both concrete and reinforcement contributions increase the median capacity and HCLPF by approximately 11-20% compared to code-based approaches. These findings highlight the significant influence of tensile strength modeling on seismic performance assessment. The proposed method enables a more realistic and practical evaluation of anchor tensile strength, thereby improving the seismic safety assessment of nuclear power plant equipment.

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    Reference

    Journal Abbreviation J. Earthq. Eng. Soc. Korea
    Frequency Bimonthly
    Doi Prefix 10.5000/EESK
    Year of Launching 1997
    Publisher Earthquake Engineering Society of Korea
    Indexed/Tracked/Covered By