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Structural Engineering and Mechanics Volume 22, Number 1, January10 2006 , pages 53-70 DOI: https://doi.org/10.12989/sem.2006.22.1.053 |
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Modal and structural identification of a R.C. arch bridge |
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C. Gentile
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| Abstract | ||
| The paper summarizes the dynamic-based assessment of a reinforced concrete arch bridge, dating back to the 50?. The outlined approach is based on ambient vibration testing, output-only modal identification and updating of the uncertain structural parameters of a finite element model. The Peak Picking and the Enhanced Frequency Domain Decomposition techniques were used to extract the modal parameters from ambient vibration data and a very good agreement in both identified frequencies and mode shapes has been found between the two techniques. In the theoretical study, vibration modes were determined using a 3D Finite Element model of the bridge and the information obtained from the field tests combined with a classic system identification technique provided a linear elastic updated model, accurately fitting the modal parameters of the bridge in its present condition. Hence, the use of output-only modal identification techniques and updating procedures provided a model that could be used to evaluate the overall safety of the tested bridge under the service loads. | ||
| Key Words | ||
| ambient vibration testing; arch bridge; enhanced frequency domain identification technique; finite element model updating; output-only modal identification; peak picking technique. | ||
| Address | ||
| Department of Structural Engineering, Politecnico di Milano, Milan, Italy | ||