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http://dx.doi.org/10.12989/sss.2014.14.3.445

Damping and frequency changes induced by increasing levels of inelastic seismic demand  

Aguirre, Diego A. (Department of Civil Engineering and Surveying, University of Puerto Rico at Mayaguez)
Montejo, Luis A. (Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez)
Publication Information
Smart Structures and Systems / v.14, no.3, 2014 , pp. 445-468 More about this Journal
Abstract
The objective in this research is to determine the feasibility of using changes on the dynamic properties of a reinforced concrete (RC) structure to identify different levels of seismic induced damage. Damping ratio and natural frequency changes in a RC bridge column are analyzed using different signal processing techniques like Hilbert Transforms, Random Decrement and Wavelet Transforms. The data used in the analysis was recorded during a full-scale RC bridge column shake table test. The structure was subjected to ten earthquake excitations that induced different levels of inelastic demand on the column. In addition, low-intensity white noises were applied to the column in-between earthquakes. The results obtained show that the use of the damping ratio and natural frequency of vibration as damage indicators is arguable.
Keywords
damping ratio; natural frequency; reinforced concrete; bridge column; random decrement technique; wavelets; Hilbert Transform;
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Times Cited By KSCI : 3  (Citation Analysis)
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