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Structural Engineering and Mechanics
  Volume 49, Number 3, Februrary10 2014 , pages 411-425

Damage assessment of frame structure using quadratic time- frequency distributions
Sabyasachi Chandra and S.V. Barai

    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.
Key Words
    damage detection; nonlinear features; frame structure; time-frequency distributions; location
Sabyasachi Chandra : Department of Civil Engineering, Dr. B.C. Roy Engineering College, Durgapur, West Bengal, India
S.V. Barai : Department of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal, India

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