Damage Detection Using Model Updating and Identification Techniques

The problem for damage detection and localisation is approached employing two different techniques for fault localisation and quantification. A case study on a reinforced concrete beam with distributed damage of crack accumulation is studied. The measured frequency response functions are used as vibration data for the structure, on the basis of which the localisation procedures are performed. The considered localisation procedures are model based and use a FE model of the structure. One of the approaches suggests the use of a residual energy criterion for the fault localisation, followed by an updating procedure for an eventual quantification of the defect. The other procedure employs pattern recognition techniques for a primary localisation of the damage in a part of the structure, followed by an identification procedure for more accurate localisation and quantification. A comparison of the results and performance of both techniques is provided.