谈基于数字相关法桥梁结构的检测应用

Applications of Digital Correlation Method to Structure Inspection

光学技术几乎没有应用于结构检查中,但其具有不用接触且使用简单设备便可观看到整体的优点。结构检测最主要的要求是全部应变的精度要求和现场测量能力。数字相关法作为一种新的光学变形测量工具,能满足所有结构检测的要求。平滑算法可以大大提高应变测量精度,且论文中还研究了三维的数字相关法。为了验证这一改进,由计算机模拟散斑图像来对比应变测试。此外,采用了包括典型材料及结构样式的三个结构检测的例子:钢筋混凝土桩快速剪切应力分布的层状岩石,复合材料结构的三维应变分布,在两个钢桥连接处的应力。研究表明,这种结构检查工具是可行的,且这种无损检测技术有明显的优势。

In structure inspections, applications of optical techniques are rare, but the advantages of a non-contact, full field technique using a simple apparatus are atU-active. The main requirements for structure inspection are the full-field strain measurement with the required precision and on-site measurement ability. The digital correlation method, a new optical deformation measurement tool, can satisfy all of the requirements for structure inspection. A smoothing algorithm which can greatly improve the strain measurement precision, and a 3-D digital correlation method have been developed in this paper. For verifying this improvement, a comparison of strain measurements by computer-simulated speckle images has been carried out. Additionally, three structure inspection examples that cover typical materials and structure styles are presented： the inter-face shear stress distribution for reinforced concrete piles bedded on rock, the 3-D strain distribution of a composite vessel structure, and stresses in a hookup that connects two steel bridge structures. All the examples show that the new structural inspection tool is exemplary and illustrates the obvious advantages of this optical non-destructive tachnique.