CFRP 재킷으로 보강한 철근콘크리트 기둥의 차량 충돌 시 동적 응답 및 손상 규명

초록

This study investigates the dynamic response and damage state of reinforced concrete (RC) bridge columns with and without carbon fiber reinforced polymer (CFRP) jacket subjected to vehicle collision loads through numerical analysis. The numerical models of bridge columns were validated against experimental data available in literature, showing good agreement in impact force, lateral displacement, and energy dissipation. The validated model was then applied to full-scale bridge columns to simulate realistic column-truck collision scenarios. A parametric study examined ten variables that affect the post-impact damage of the columns. Among them, the column diameter, number of CFRP jacket layers, and fiber orientation were identified as key parameters. The extent of damage was evaluated in terms of rotation angle defined as the ratio of maximum lateral displacement to collision height. The results showed that CFRP jacket was especially effective for smaller-diameter columns. The findings demonstrate the potential of CFRP jacket to improve the collision performance of the RC bridge columns and provide valuable insights for future design and retrofit efforts.

키워드