United States Department of Transportation
i
Digital image rectification tool for metrification of gusset plate connections in steel truss bridges.
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2009-03-01
[PDF-2.44 MB]
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Edition:Final report.
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Abstract:A method was developed to obtain dimensional data from photographs for analyzing steel truss gusset plate
connections. The method relies on a software application to correct photographic distortion and to scale the
photographs for analysis. The approach enables rapid and accurate collection of dimensional measurements
compared to traditional methods. Users can quickly create AutoCAD drawings by collecting dimensional
information about the gusset plates from the photographs. The rectified photographs provide a record of field
conditions that can be compared with subsequent field inspection results to help identify and quantify long term
changes in visual characteristics. The implementation procedure is straightforward and does not require specialized
knowledge of photogrammetry. It can be practically employed under field conditions using current technology and
personnel, and it reduces the likelihood of data entry errors. Dimensional measurements from the method provide
results that are as good conventional field measurements and are within tolerances that most engineers would find
reasonable for gusset plate connection capacity evaluations.
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