混凝土损伤应变与微裂纹的实验研究

采用数字图像相关方法测量了混凝土表面损伤应变场。基于该应变场分析得到了肉眼不可见微裂纹的准确位置,并研究了混凝土立方体在单轴压缩的情况下,平均损伤应变与平均裂纹宽度的相关性。研究结果说明基于数字图像相关的混凝土表面微裂缝的定位方法是可行的。宽度小于0.1 mm微裂缝与平均损伤应变呈线性变化的关系。研究结果可用于判断混凝土微裂缝的位置、发展程度,为进行科学有效的控制或修补,提高结构安全性提供参考。

Experimental study of damage strain and microcrack on concrete

Digital image correlation method was used to measure the damage strain field on concrete surface and analyze accurate position of microcrack invisible to human eyes based on damage strain field. The relevance of average damage strain and average microcrack width on surface of concrete cube under uniaxial compression was studied. The results show it is viable to locate microcrack on concrete by digital image correlation method and linear relates average strain and microcrack its width less than 0.1mm. Achievements in this study can provide valuable reference to locate and monitor microcrack of concrete and enhance the safety of concrete structure.