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原文传递 Digital Image Rectification Tool for Metrification of Gusset Plate Connections in Steel Truss Bridges. Final rept.

题名：	Digital Image Rectification Tool for Metrification of Gusset Plate Connections in Steel Truss Bridges. Final rept.
作者：	Higgins-C.; Nguyen-Q.D.
关键词：	Bridges-; Steels-; *Photography-.;Inspection-; Measurement-; Trusses-.
摘要：	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.
报告类型：	科技报告