Smart Structures and Systems

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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)
  • Received : 2017.06.09
  • Accepted : 2018.03.13
  • Published : 2018.04.25
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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.

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