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http://dx.doi.org/10.12989/sss.2018.21.4.449

Simultaneous identification of damage in bridge under moving mass by Adjoint variable method  

Mirzaee, Akbar (Department of Civil Engineering, Iran University of Science and Technology)
Abbasnia, Reza (Department of Civil Engineering, Iran University of Science and Technology)
Shayanfar, Mohsenali (Department of Civil Engineering, Iran University of Science and Technology)
Publication Information
Smart Structures and Systems / v.21, no.4, 2018 , pp. 449-467 More about this Journal
Abstract
In this paper, a theoretical and numerical study on bridge simultaneous damage detection procedure for identifying both the system parameters and input excitation mass, are presented. This method is called 'Adjoint Variable Method' which is an iterative gradient-based model updating method based on the dynamic response sensitivity. The main advantage of proposed method is inclusion of an analytical method to augment the accuracy and speed of the solution. Moving mass is a model which takes into account the inertia effects of the vehicle. This interaction model is a time varying system and proposed method is capable of detecting damage in this variable system. Robustness of proposed method is illustrated by correctly detection of the location and extension of predetermined single, multiple and random damages in all ranges of speed and mass ratio of moving vehicle. A comparison study of common sensitivity and proposed method confirms its efficiency and performance improvement in sensitivity-based damage detection methods. Various sources of errors including the effects of measurement noise and initial assumption error in stability of method are also discussed.
Keywords
damage detection; finite element model updating; sensitivity; Ill posed problem; simultaneous identification; Adjoint variable method;
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