Structural Engineering and Mechanics

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A novel sensitivity method to structural damage estimation in bridges with moving mass

  • Mirzaee, Akbar (Department of Civil Engineering, Iran University of Science and Technology) ;
  • Shayanfar, Mohsenali (Department of Civil Engineering, Iran University of Science and Technology) ;
  • Abbasnia, Reza (Department of Civil Engineering, Iran University of Science and Technology)
  • Received : 2014.09.25
  • Accepted : 2015.04.20
  • Published : 2015.06.25
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Abstract

In this research a theoretical and numerical study on a bridge damage detection procedure is presented based on vibration measurements collected from a set of accelerometers. This method, referred to as "Adjoint Variable Method", is a sensitivity-based finite element model updating method. The approach relies on minimizing a penalty function, which usually consists of the errors between the measured quantities and the corresponding predictions attained from the model. Moving mass is an interactive model and includes inertia effects between the model and mass. This interactive model is a time varying system and the proposed method is capable of detecting damage in this variable system. Robustness of the proposed method is illustrated by correct 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 comparative study on common sensitivity and the proposed method confirms its efficiency and performance improvement in sensitivity-based damage detection methods. In addition various possible sources of error, including the effects of measurement noise and initial assumption error in stability of method are also discussed.

Keywords

References

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