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Vibration Amplitude - Dependent Natural Frequency and Damping Ratio of Repaired Pier Model

Abstract : The present work aims to investigate the dependency of dynamic characteristics such as the natural frequency and the damping ratio of pier model on the vibration amplitude under a series of different vibration levels. Several free vibration tests with a wide range of amplitudes were, therefore, carried out under excitation with relatively small amplitude levels. The pier model was subjected to a progressive damage by conducting a shaking table test to study the influence of different damage scenarios on its dynamic characteristics. After the damage occurs at the plastic hinge zone of the pier model, free vibration tests with different amplitude excitation were carried out to derive the dynamic characteristics of the damaged pier model. Furthermore, after the damage of the pier model was repaired by carbon fiber sheets (CFS) jacketing, free vibration test was carried out again, to derive the dynamic characteristics of the repaired pier model. Generally, this study indicates that overall natural frequency and damping ratio are very sensitive to vibration amplitude level. Particularly, whenever the acceleration amplitude increases, damping ratio significantly increases while natural frequency slightly decreases. Also, the repairing method by CFS proved to be effective in restoring performance characteristics of damaged pier.
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https://hal.inria.fr/hal-01021065
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Submitted on : Wednesday, July 9, 2014 - 8:47:58 AM
Last modification on : Friday, September 4, 2020 - 2:20:04 PM
Long-term archiving on: : Thursday, October 9, 2014 - 10:53:38 AM

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Reem Alsehnawi, Akinori Nakajima, Ryuji Takeshima, Hafez Al Sadeq. Vibration Amplitude - Dependent Natural Frequency and Damping Ratio of Repaired Pier Model. EWSHM - 7th European Workshop on Structural Health Monitoring, IFFSTTAR, Inria, Université de Nantes, Jul 2014, Nantes, France. ⟨hal-01021065⟩

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