Structural health monitoring of a concrete-filled tube column
Structural Health Monitoring (SHM) has provided an opportunity to assess the reliability and integrity of civil engineering structures. Damage in the structure reduces the hardness and modal properties of the structures. Therefore, changes in dynamic behavior and modal data can be used to identify damage. This study identifies the existence and location of damage in the CFT column based on vibrational analysis techniques. The method for damage detection is based on dynamic analysis on the modal data (mode shape, frequency and damping) of the structure. The experimental results obtained the modal test and the results of the theory of FE simulation have been used to identify the damage. In the first step, after creating the prototype and preparing the test setup, the specimen was subjected to a modal test, so the modal data were extracted, and the Coherence curve test were plotted to confirm the accuracy. Similarly, the FE model is also simulated after validation, so the modal data of the theory were also extracted. In the second step, based on the obtained data, the comparison of frequencies, MAC and COMAC criteria, mode shape and damping of an undamaged and damaged specimens were performed, and the identification of the damage was dealt with. In the third step, the Continuous Wavelet Transform(CWT) tool was used in order to determine the location of the damage in both methods (FE and experimentally), to identify the damage location on the mode shape (CWT input signal). The results show that in the both the methods, the existence of damage in the CFT column is well identified and its location is also determined with high precision, which indicates the ability of damage detection method by CWT techniques.