- Damage Assessment of Structures using Sensitivity of Modal Data
- Jeong, Youn-Ju ;
- Journal of The Korean Society of Civil Engineers, volume 19, issue 1_5, 1999, Pages 649~649
Abstract
A system identification technique by modal data is simple in principle and adequate for the damage assessment of infrastructures such as bridges, where the dynamic force is difficult to be applied. However, since the localized damage of a structure greatly affects higher modes, for an accurate damage assessment, the inclusion of higher modes is essential. In that case, the increased number of constraints and their nonlinearity may cause inefficient optimization. to overcome these difficulties, sensitivity analysis for modal data is performed. Through sensitivity analysis, constraints for some degree of freedom and vibration mode that have high sensitivity for damage are selected, MFD(modified method of feasible direction) optimization technique is applied. Damage Assessment has performed various case as varing the number of vibration modes, elements and damage properties. And its effects on accuracy of damage assessment are analyzed. As a result, sensitivity analysis for modal data improves the efficiency of optimization, and results in exact estimation for damage location and extent.