<title>Verification of nonlinear dynamic structural test results by combined image processing and acoustic analysis</title>

Abstract

An interactive data fusion methodology of video, audio and nonlinear structural dynamic analysis for potential application in forensic engineering applications is piesented.The methodology was developed and successfully demonstrated in the analysis of a heavy transportable bridge collapse during preparation for testing. In this event multiple bridge elements failures were identified after the collapse including fractuie, cracks and npmre of high performance structural materials. A hand held camcorder provided the only recorded source of information about the collapse sequence in the form of a low quality and extremely unstable videotape recording.User assisted numerical algorithms were utilized to stabilize and enhance the digitized video sequence and to produce an filtered audio account of the collapse sequence. The interactive data fusion methodology was manifested by user assistance in the process of extracting, identifying, measuring and correlating relevant audio and video information from the videotaped recording with dynamic nonlinear structural analysis of postulated bridge failure sequences.The interactive data fusion methodology produced a conclusive account of the sequence of events during the bridge collapse. It clearly identified the failure mechanism and enabled the timely correction of the failure cause.476

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