碳纤维布加固机理的动态焦散线法试验

Experiment on reinforced with CFRP using dynamic caustics method

为明确碳纤维布(CFRP)加固地下工程结构的作用机理,用动态焦散线法,对结构模型在冲击荷载的作用下,CFRP加固前后的断裂过程和动态应力强度因子KdⅠ进行了分析比较。指出了在结构表面上粘贴CFRP,可延缓裂纹的起裂,从而显著降低裂纹扩展速度和裂纹尖端的应力集中程度。CFRP加固平顶地下结构的顶部,能有效地提高地下结构的抗冲击能力。粘结剂在加固中起到相当重要的作用,提高其粘接力是增强加固效果的有效途径。

Nowadays, the CFRP reinforcement is more commonly used than ever before to enhance the resistance of the underground structure against impact. With dynamic caustics method, the whole rupturing course of the model of the underground structure as well as the dynamic stress intensity factor K1^d were both studied and analyzed comparatively under and without the condition of impact. Consequently, a novel method to improve the reinforcement use of carbon fiber was obtained.