New Methods for Inspection and Evaluation of Steel Gusset Plate ...

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Overall Approach• Capture images in field with digitalcameras (snooper, climbing, fromground level)• Process images into scaledorthophotos• Extract geometric data (machinevision techniques)• Produce FE models (OpenSees)• Run nonlinear finite elementanalyses to rate connections(OpenSees)• No high-level training required• Integration from constructioninspection to rating and archiving
Methodology• Many fabricated steelelements lie in plane :2-D correspondencessimplify transformation• Point correspondences usedto map points based oncentral projection.• Need to establish controlpoints in the real worldimage.X ’ is point inphotographicimage plane(pixel)X is point in “realworld” imageHartley and Zisserman, Multiple View Geometry in Computer Vision, 2004
Page 1 and 2: New Methods for Inspection and Eval
Page 6 and 7: Methodology• Relate image points
Page 8 and 9: MethodologyReference Targets and Im
Page 10 and 11: Strain Relief Liquid-Tite ® Condui
Page 12 and 13: Image Rectification ToolExampleMATL
Page 14 and 15: Field Implementation ExamplesExampl
Page 16 and 17: Field Implementation ExamplesExampl
Page 18 and 19: Example -Complex CNC Fabrication
Page 20 and 21: Real vs Ideal Compared• Typical V
Page 22 and 23: Mosaic from Multiple Images
Page 24 and 25: FisheyeEquisolid-angle projection:
Page 26 and 27: Close-Range StepsFisheye Image@ arm
Page 28: 3D Imaging - Plate Imperfections=+A
Page 32 and 33: Tracking Changes Over Time
Page 34 and 35: Nonlinear FE Analysis from Image Da
Page 36 and 37: Automatic Output Generation (Servic
Page 38: Gusset Plate Experimental Setup
Page 42 and 43: AcknowledgementsBruce Johnson - Chi
Page 44: Questions?

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