Structure status determination device, status determination system, and status determination method

A status determination method comprising:

• calculating, from time-series images of a structure surface before and after loading application, a two-dimensional spatial distribution of a displacement of the time-series images;
• calculating a moving amount of the structure surface in a normal direction due to the loading application, from the two-dimensional spatial distribution of the displacement of the time-series images;
• calculating a correction amount based on the moving amount;
• separating a two-dimensional spatial distribution of a displacement of the structure surface, by subtracting the correction amount from the two-dimensional spatial distribution of the displacement of the time-series images;
• and
• identifying a defect of the structure, based on comparison of the two-dimensional spatial distribution of the displacement of the structure surface and the moving amount, with a spatial distribution of a displacement having been prepared in advance and a threshold value for the moving amount.

A status determination device comprising:

• a displacement calculation circuit that, from time-series images of a structure surface before and after loading application, calculates a two-dimensional spatial distribution of a displacement of the time-series images;
• a depth moving amount calculation circuit that calculates a moving amount of the structure surface in a normal direction due to the loading application, from the two-dimensional spatial distribution of the displacement of the time-series images;
• a displacement separation circuit that calculates a correction amount based on the moving amount, and separates a two-dimensional spatial distribution of a displacement of the structure surface, by subtracting the correction amount from the two-dimensional spatial distribution of the displacement of the time-series images;
• and
• an abnormality determination circuit that identifies a defect of the structure, based on comparison between the moving amount and a threshold value for the moving amount having been prepared in advance.