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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.69-77
DOI : https://doi.org/10.5000/EESK.2026.30.2.69

Shear Strength of Reinforced Concrete Squat Walls in Nuclear Power Plant Buildings Under Bi-Axial Loading According to Aspect Ratio

Yang Hyeon Keun1)*, Park Jun Hee2), Kim Min Kyu2)
1)Post-doctoral Researcher, Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute, 2)Principal Researcher, Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute

Abstract

This study investigates the seismic behavior of low-aspect-ratio reinforced concrete (RC) shear walls when subjected to bi-axial lateral loading, using nonlinear finite element analysis. A three-dimensional finite element model was developed with the DIANA program and validated against previously reported experimental results. Subsequently, a parametric study was conducted by varying the wall aspect ratio of horizontal reinforcing bars under both uni-axial and bi-axial loading conditions. The analysis results show that bi-axial loading reduces shear strength by a significant amount compared to uni-axial loading, and the reduction becomes more pronounced as the aspect ratio decreases. For low-aspect-ratio walls, the influence of horizontal reinforcement on shear strength was limited, while sensitivity to bi-axial loading increased. These findings indicate that uni-axial loading–based evaluation methods may overestimate the seismic capacity of low-aspect-ratio RC shear walls.

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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