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Field Verification of the Damage Index Method in a Concrete Box‐Girder Bridge via Visual Inspection
Author(s) -
Park Sooyong,
Stubbs Norris,
Bolton Robert,
Choi Sanghyun,
Sikorsky Charles
Publication year - 2001
Publication title -
computer‐aided civil and infrastructure engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.773
H-Index - 82
eISSN - 1467-8667
pISSN - 1093-9687
DOI - 10.1111/0885-9507.00213
Subject(s) - structural engineering , bridge (graph theory) , box girder , superstructure , visual inspection , modal , modal analysis , deck , nondestructive testing , field (mathematics) , girder , engineering , materials science , finite element method , computer science , composite material , mathematics , artificial intelligence , physics , medicine , quantum mechanics , pure mathematics
The structural condition of a concrete box‐girder bridge is monitored twice by detecting and localizing potential damage in the bridge superstructure. Experimental field data were collected on the bridge in December 1997 and 9 months later in September 1998. Modal parameters for the structure are extracted from the measured frequency‐response functions, and the resulting resonant frequencies and modeshapes are fed into a proven systems identification procedure. Modal parameters from the identified baseline structure and the modal parameters determined in the field are used as input to a field‐tested nondestructive damage‐evaluation method (the damage index method) to localize damage in the bridge superstructure. To provide some evidence of the veracity of the predictions of the possible damage locations, a visual inspection was performed on the bridge in May 1999, and surface cracks on the deck were recorded. A comparison of the predicted damage locations on the superstructure with the surface cracks documented via visual inspection is provided. The results indicate that a strong correlation exists between the predicted damage locations and the observed surface crack pattern.