CFRP加固损伤钢板的双轴拉伸性能研究

STUDY ON BIAXIAL TENSION OF CRACKED STEEL PLATES REINFORCED BY CFRP PLATES

基于虚拟裂纹闭合法模拟受双轴向载荷的含裂纹塑性钢板断裂过程,利用减小裂纹裂尖处应力强度因子的方法确定了CFRP的加固方案,通过有限元仿真分析了双轴试样加固前后的对比效果,最后结合模型试验验证了加固方案和计算方法。研究表明,虚拟裂纹闭合法可以有效模拟受双轴向载荷裂纹的扩展过程,仿真结果与试验结果吻合较好。对于受双轴向载荷的含裂纹钢结构,CFRP加固后可以基本恢复原结构的承载能力,加固效果十分显著。该方法可以进一步用于复合型裂纹的加固方案确定。

The failure process of steel plates under biaxial tension is simulated by virtual fracture closure method. The reinforced plan is determined by reducing the stress intensity factor of crack. Load-displacement curves of the reinforced specimen and unreinforced specimen under biaxial tension are compared by FEM. Finally,the reinforced plan and simulation method are verified by experimental results. The results show virtual fracture closure method is very effective to simulate the developing progress of crack under biaxial tension. Bearing capacities of original steel structure can be basically recovered by using CFRP. The biaxial steel plates reinforced by CFRP is obviously increased to an extent. This method can be used to reinforce steel with composite crack.