Damage Identification for a Steel-Constructed Platform Using Output-Only Data of Structural Dynamic Response

Wavelet packet energy spectrum is used to identify the damage of a large-scale steel platform using output-only data of structural dynamic response for the particularity of enduring reiterative impact loading. By way of removing the effects of environment factors to the results of damage identification, a method combining wavelet packet energy spectrum and factor analysis belonging to multivariate statistic methods is developed. At last the validity and veracity of the new method are validated by numerical simulation experiments. The results of simulation experiments show that, the damage of the structure can be identified exactly by the method, the damage extent of the structure can be identified qualitatively through the value of damage index, and the results of damage identification can´t be affected by the sampling location.