Abstract
Health assessment of a structure is various. In the architecture and civil engineering, a natural frequency is calculated by conducting the frequency analysis of the response waveform of the structure. In the case of a digital image correlation method, if a picture and time are connected, the displacement response of the structure will be obtained. Hence, we considered the applicability to the vibration phenomenon. We performed displacement comparison with a finite element method, and then investigated the accuracy of the displacement response waveform. As a result, good evaluation was obtained within a maximum of 0.07 pixels and an average of 0.028 pixels. Furthermore, it succeeded in assessment of the natural frequency by the frequency analysis. The natural frequency which changes in the structure was also able to be presumed within the error of the maximum of 2.85 Hz. The health assessment of the structure is possible by using the digital image correlation method and frequency analysis.
