【摘要】 为探究碳纤维增强复合材料（carbon fiber reinforced plastics, CFRP）加固损伤钢筋混凝土（reinforced concrete, RC）梁的抗冲击性能，利用有限元分析软件LS-DYNA，对不同CFRP加固方式下损伤梁的动态响应进行了数值模拟研究，并与物理试验结果进行对比验证．对加固梁的破坏模式、裂缝扩展规律和动态时程响应进行分析．结果表明，U型CFRP加固梁能显著抑制剪切斜裂缝的发展，大幅减小裂缝开展范围；在第1次冲击时，相较于未加固梁，平直型、U型和复合型CFRP加固梁的峰值冲击力分别提高了15.4%、16.6%和13.1%，跨中峰值位移分别降低了4.8%、8.3%和10.1%；在第2次冲击时，U型和复合型CFRP加固梁仍表现出较好的抗冲击性能．研究结果可为CFRP加固损伤RC梁的优化设计提供参考．更多还原

【Abstract】 In order to investigate the impact resistance of damaged reinforced concrete(RC) beams strengthened with carbon fiber reinforced plastics(CFRP), the dynamic responses of the damaged beams under different CFRP reinforcement methods are simulated using the finite element analysis software LS-DYNA and compared with the experimental results. The analysis results of failure pattern, crack propagation pattern and dynamic history of the strengthened beams show that the U-shaped CFRP strengthened beam can significantly inhibit the development of shear diagonal cracks and greatly reduce the crack propagation range. At the first impact, compared with the un-strengthened beam, the peak impact force of the straight, U-wrapping and composite CFRP strengthened beams increased by 15. 4%, 16. 6% and 13. 1%, respectively, and the mid-span peak displacement decreased by 4. 8%,8. 3% and 10. 1%, respectively. At the second impact, the U-wrapping and composite CFRP strengthened beams remained good impact resistance. The study can provide a reference for the optimal design of damaged RC beams strengthened with CFRP.更多还原