이중곡률 철근콘크리트 전단벽의 비선형 해석을 위한 모델링 기법에 관한 연구

초록

This study investigates the nonlinear seismic response characteristics of slender reinforced concrete walls exhibiting double-curvature behavior, which typically occurs in the front elevation of wall-type structures with deep coupling beams. To assess the modeling accuracy and practical applicability of analysis techniques, two numerical models the Fiber Element Model (FIBEM) and the Concentrated Plastic Hinge Model (CPHM) were applied. The influence of the coupling beam-to-wall stiffness ratio on wall behavior was analyzed, with particular focus on the curvature reversal mechanism.The FIBEM enables detailed simulation of distributed plasticity and material nonlinearity through sectional discretization, whereas the CPHM facilitates efficient modeling by idealizing structural components using rigid connections and plastic hinges based on the Equivalent Frame Model(EFM). Compared to the benchmark FIBEM, the CPHM tended to somewhat overestimate energy dissipation while accurately reproducing initial stiffness, peak strength, and the shape of the hysteretic envelope. However, for models with stiffness ratios greater than 7, the CPHM underpredicted both energy dissipation and ultimate strength relative to the FIBEM, indicating limitations in capturing nonlinear cyclic behavior at higher stiffness ratios. Analysis results as a function of the stiffness ratio, for both models, the sum of top and bottom rotations increased with higher stiffness ratios, consistent with the formation of curvature reversal in the mid-height region. While the FIBEM resulted in greater absolute rotation values and wider dispersion, the CPHM showed more consistent responses concentrated near the trend line, with narrower 95% confidence intervals. Therefore, the CPHM is considered a useful approach for predicting the double-curvature behavior of walls under cyclic loading in terms of both analytical reliability and practical applicability.

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