“光敏薄层”技术是一项新的测试技术,可以应用的领域是比较广阔的。本文主要介绍利用贴在结构表面的“光敏薄层”观测研究钢筋混凝土结构在荷载作用下裂缝的出现、发展以及在整个弹塑性阶段的变形特征,利用应力(应变)条纹图对裂缝进行定量分析。刚度和裂缝是衡量结构功能的一项重要指标。长期以来,对裂缝的观测仅限于两类方法:一是用 “Photosensitive thin layer” technology is a new test technology, and the applicable field is relatively broad. This article mainly introduces the use of “photosensitive thin layer” attached to the surface of the structure to observe the appearance and development of cracks in reinforced concrete structures under load, and the deformation characteristics of the entire elasto-plastic stage. The stress (strain) fringe pattern is used to crack the cracks. Quantitative analysis. Stiffness and cracks are an important indicator of structural function. For a long time, the observation of cracks was limited to two types of methods: First, the use of