关键词: 预应力, 荷载, 位移, 二次张拉, 拐点识别

Abstract: Nowadays, the main method of judging the inflection point generated in the second pre-stressed tension of anchor rope is to estimate the tension and displacement of inflection point. To this issue, the article analyzes the physical characteristics of the secondary tension, removes the disturbance characteristics of external factors during the construction process. Bring up the mathematical model and the general process of inflection point identification. Propose to filter the exception points by the median average filtering algorithm, and optimize the sampling data by Lagrange parabolic interpolation algorithm, then calculate the accurate value of inflection point at last. The experiment result shows that it can locate the inflection point rapidly by this method, improving the efficiency and accuracy of the inflection point identification.

Key words: pre-stressed tension, load, displacement, second tensioning, inflection point identify