PCA Based Condition Assessment of RC Framed Building

Output-only algorithms are most useful for modal identification when input excitations are not easily available. In the present study, a principal component analysis (PCA) based method is utilized to extract the modal characteristics of the Millikan library building, where only structural responses are available (output-only). This study also considers the changes in the modal behavior of the building, before and after the major earthquake events. Detection of these changes can help in better decision-making, for monitoring the health of the structure and to devise a suitable plan for retrofitting.