Journal of Structural Engineering
In this first part of a two-part paper, development of a method of dynamic system identification for timber beams is presented with an analytical verification of the method using a finite-element model. A method of global nondestructive evaluation for identifying local damage and decay in timber beams is investigated in this paper. Experimental modal analysis is used in conjunction with a previously developed damage localization algorithm. The damage localization algorithm utilizes changes in modal strain energy between the mode shapes of a calibrated model, representing the undamaged state of the beam of interest, and the experimentally obtained mode shapes for a timber beam. Analytical evaluations were performed to demonstrate and verify the use of this method of global nondestructive evaluation for the localization of damage or decay in timber beams. In a companion paper, experimental laboratory tests are presented that verify the use of dynamic system identification to locate damage within timber beams.
Peterson, S T.; McLean, D I.; Symans, M D.; Pollock, David; Cofer, W F.; Emerson, R N.; and Fridley, Kenneth J., "Application of Dynamic System Identification to Timber Beams - part I" (2001). Faculty Publications - Department of Mechanical and Civil Engineering. 35.