Título: | EVALUATION OF MODAL INDICES FOR DAMAGE IDENTIFICATION ON STEEL FOOTBRIDGES | ||||||||||||
Autor: |
AUGUSTO CESAR MIRANDA FEIJAO |
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Colaborador(es): |
ELISA DOMINGUEZ SOTELINO - Orientador CASSIO MARQUES RODRIGUES GASPAR - Coorientador |
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Catalogação: | 27/JUN/2023 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=63038&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=63038&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.63038 | ||||||||||||
Resumo: | |||||||||||||
Among the various damage detection methodologies, the Vibration-based
damage identification (VBDI) methods stand out, since the deterioration present
in structural elements directly influences the global and local dynamic response
of the structure, causing changes in the dynamic parameters. The different
approaches found in the literature review for dynamic damage detection focus
mainly on one-dimensional or straight structures, which in turn may not represent
the actual dynamic behavior of bold structures such as bridges and footbridges
with different geometry. Some modal indices, namely modal curvature, modal
flexibility, and modal strain energy were evaluated for a steel footbridge with
curved geometry. For this purpose, a finite element model of it was used, from
which the three-dimensional mode shapes were extracted. In addition, a recently
proposed index, called resultant vector, which incorporates three-dimensional
modal coordinates, is also evaluated and compared to the aforementioned ones.
The results show that the accuracy of the indices for damage localization is
correlated with the region of the structure where the damage is located. It is then
concluded that for damage detection in a real structure, it is necessary to use more
than one damage index. The impact of the damage magnitude on the accuracy of
the indices is also studied. The influence of damage in adjacent beams and how
this is reflected in the indices is also investigated in order to avoid ambiguity in
damage location, and to correctly direct inspections and structural integrity
monitoring programs.
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