Research on structural damage identification of bridge engineering based on dynamic parameters

In this paper, the advantages and limitations of certain methods are evaluated in terms of theory and their practical implementation, when considering the analysis of damage diagnosis methodologies in civil engineering structures in relation to new structural dynamic properties. Methods of damage diagnosis such as reliance on natural frequency, vibration mode, a change of the finite-element model and the flexibility matrix are discussed in detail in this paper. The results indicate that the reconstruction error decreases by a maximum of 15% with increase in damage severity, and the maximum damage index has a growing trend. The accuracy of the proposed method in detecting the location of multiple instances of damage reaches more than 90%, indicating a high level of consistency in different damage cases. In the experiment conducted, the peak value of the single-damage index curve is clearly visible at the point of damage, and the peak value grows depending on the severity of the damage. Specifically, the variation of the reconstruction error changes by an amount of −15%, whereas the maximum value of the damage index increases in the presence of more severe damage. It can be stated that the technique developed exhibits great reliability in detecting damage under varying conditions. In particular, over 90% accuracy was achieved when determining multiple damage points. Moreover, although different severities of damage were present at some points, all damaged positions were detected successfully.