집중소성모델을 활용한 중공 철근콘크리트 교량 기둥의 이력 거동 예측

초록

This study develops predictive equations for model parameters to simulate the nonlinear hysteretic behavior of hollow reinforced concrete (RC) columns using a lumped plasticity model. The model parameters were calibrated against previously reported experimental results, and predictive equations were derived through regression analysis. The proposed equations exhibited better accuracy compared with an existing distributed plasticity model in terms of initial stiffness, maximum strength, and strength degradation. The proposed model was applied to numerical bridge models incorporating hollow RC columns, and a parametric study was conducted to evaluate seismic fragility curves under varying design parameters. The results indicated that shear span, longitudinal reinforcement ratio, and section thickness are critical parameters influencing the seismic vulnerability of hollow RC columns.

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