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采用光弹性方法研究结构应力的分布，是通过在受弯构件的内力、外力与等差线条纹级决之间建立起数学模型，利用光测实验手段，确定构件的内力．这种光弹实验的方法对复杂结构进行内力分析优势尤为突出，其方法简单、结果准确，有显著的实际意义．
The use of photoelasticity method to study the distribution of structural stress is to establish a mathematical model between the internal force of the flexural member, the external force and the progression of the equal-difference line stripe. The internal force of the component is determined by means of optical measurement experiments. This kind of photoelastic experiment method is particularly advantageous for internal force analysis of complex structures. The method is simple, accurate, and has significant practical significance.