Damage characterization through nonlinear analysis of transient vibrations

M. R. Hajj, C. C. Chabalko, J. C. Duke, Sami El-Borgi, S. Bahlous Elouafi, S. Choura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The basic notion behind vibration-based structural health monitoring is that changes in the physical properties of the structure such as mass, flexibility and stiffness vary the structural response characteristics such as the natural frequencies, mode shapes and damping ratio. Because of their dependence on environmental and other conditions than on damage, natural frequencies alone may not be sensitive enough to be used as parameters for damage characterization. This work aims to present specific nonlinear parameters and show their relatively higher sensitivity, in comparison to natural frequencies, to damage conditions. Because ambient vibrations can be transient and nonstationary, wavelet-based higher-order spectral moments are proposed as the tools to derive these parameters. As a numerical example, the higher sensitivity of the nonlinear parameters is demonstrated through the analysis of the damped response of a nonlinear system. The same nonlinear parameters are derived from vibration measurements of an eight-span simply supported bridge with a continuous slab over the SidiBouAli river in Tunisia to show that these parameters can be derived from full scale tests.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App
Pages7747-7755
Number of pages9
Volume11
Publication statusPublished - 2006
Externally publishedYes
Event47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Newport, RI, United States
Duration: 1 May 20064 May 2006

Other

Other47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityNewport, RI
Period1/5/064/5/06

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ASJC Scopus subject areas

  • Architecture

Cite this

Hajj, M. R., Chabalko, C. C., Duke, J. C., El-Borgi, S., Elouafi, S. B., & Choura, S. (2006). Damage characterization through nonlinear analysis of transient vibrations. In Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App (Vol. 11, pp. 7747-7755)