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A platform for research: civil engineering, architecture and urbanism
Ambient vibration-based model updating of similar R.C. arch bridges
A rational methodology for the dynamic-based assessment of similar reinforced concrete (R.C.) arch bridges has been applied in the paper. The outlined approach is based on ambient vibration testing, output-only modal identification and Finite Element model updating. For each bridge, at least 12 vertical modes (8 bending and 4 torsion) were identified from ambient survey in the frequency range 0-11 Hz, being a one-to-one correspondence between the observed modes of the different structures. Successively, the information obtained from the field tests were used to validate and improve a 3D F.E. model of each bridge. In the structural identification part of the study, the distribution of the Young's modulus over each bridge was updated in order to take advantage of the similarity of the structures. To this purpose, few finite element analyses have been performed, each with a different choice of the updating parameters, as suggested in (Douglas & Reid, 1982). Based on the results of these theoretical analyses, the dependence of each modal parameter of the model on the updating parameters is approximately determined and compared to its experimental counterpart in a minimization algorithm to provide the optimal estimate of the structural parameters. The application of the simple Douglas-Reid method to the investigated bridges provided, with a very limited computational effort, stable estimates of the updating parameters, which are also in good agreement with the available characterization of the materials. In addition, the resulting optimal models accurately fit the actual modal parameters of each bridge. As a final remark, the adopted technique of structural identification seems to be especially suitable not only for the dynamics-based updating of similar structures models but generally to generate in a simple way a good starting point for more advanced updating procedures.
Ambient vibration-based model updating of similar R.C. arch bridges
A rational methodology for the dynamic-based assessment of similar reinforced concrete (R.C.) arch bridges has been applied in the paper. The outlined approach is based on ambient vibration testing, output-only modal identification and Finite Element model updating. For each bridge, at least 12 vertical modes (8 bending and 4 torsion) were identified from ambient survey in the frequency range 0-11 Hz, being a one-to-one correspondence between the observed modes of the different structures. Successively, the information obtained from the field tests were used to validate and improve a 3D F.E. model of each bridge. In the structural identification part of the study, the distribution of the Young's modulus over each bridge was updated in order to take advantage of the similarity of the structures. To this purpose, few finite element analyses have been performed, each with a different choice of the updating parameters, as suggested in (Douglas & Reid, 1982). Based on the results of these theoretical analyses, the dependence of each modal parameter of the model on the updating parameters is approximately determined and compared to its experimental counterpart in a minimization algorithm to provide the optimal estimate of the structural parameters. The application of the simple Douglas-Reid method to the investigated bridges provided, with a very limited computational effort, stable estimates of the updating parameters, which are also in good agreement with the available characterization of the materials. In addition, the resulting optimal models accurately fit the actual modal parameters of each bridge. As a final remark, the adopted technique of structural identification seems to be especially suitable not only for the dynamics-based updating of similar structures models but generally to generate in a simple way a good starting point for more advanced updating procedures.
Ambient vibration-based model updating of similar R.C. arch bridges
Aktualisiertes Modell von Umgebungsschwingungen an Stahlbeton Bogenbrücken
Gentile, C. (author) / Pedrazzi, G. (author)
2006
14 Seiten, 10 Bilder, 3 Tabellen, 10 Quellen
Conference paper
Storage medium
English
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