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http://dx.doi.org/10.12989/sem.2014.49.3.411

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)
Publication Information
Structural Engineering and Mechanics / v.49, no.3, 2014 , pp. 411-425 More about this Journal
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.
Keywords
damage detection; nonlinear features; frame structure; time-frequency distributions; location;
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