A three-dimensional visualization system was developed to investigate the dynamic state of structural components using portable sensors located at multiple points. The system utilizes wireless data transfer and real-time signal processing for on-site inspection. In this study, an angular velocity sensor and an accelerometer were mounted within each sensor box to enhance the accuracy of motion visualization. The performance of the system was checked using two mock-up reinforced concrete (RC) beams. In cyclic loading tests of the mock-up, we observed the natural vibration frequency and its mode shape with a hammer excitation. Disturbance of the initial motion may potentially be used to indicate crack initiation. Furthermore, it was shown that deviations in the mode shape allowed evaluation of the damage state.
