Structural Engineering and Mechanics

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Damage assessment of frame structure using quadratic time-frequency distributions

  • Chandra, Sabyasachi (Department of Civil Engineering, Dr. B.C. Roy Engineering College) ;
  • Barai, S.V. (Department of Civil Engineering, Indian Institute of Technology Kharagpur)
  • Received : 2011.09.13
  • Accepted : 2014.01.03
  • Published : 2014.02.10
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Abstract

This paper presents the processing of nonlinear features associated with a damage event by quadratic time-frequency distributions for damage identification in a frame structure. A time-frequency distribution is a function which distributes the total energy of a signal at a particular time and frequency point. As the occurrence of damage often gives rise to non-stationary, nonlinear structural behavior, simultaneous representation of the dynamic response in the time-frequency plane offers valuable insight for damage detection. The applicability of the bilinear time-frequency distributions of the Cohen class is examined for the damage assessment of a frame structure from the simulated acceleration data. It is shown that the changes in instantaneous energy of the dynamic response could be a good damage indicator. Presence and location of damage can be identified using Choi-Williams distribution when damping is ignored. However, in the presence of damping the Page distribution is more effective and offers better readability for structural damage detection.

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References

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