Full Scale Dynamic Monitoring of Highway Bridgesby Sreenivas Alampalli, New York State Dep of Transportation, Albany, United States,
Gongkang Fu, New York State Dep of Transportation, Albany, United States,
Abstract: Sensitivity of identified modal properties by physical testing is critical for automated monitoring of bridge structural condition. It is investigated here considering flexure modes and fatigue cracking. Variation in bridge modal parameters by impact testing due to random environmental conditions is obtained on a full-scale bridge. Extent of changes in the same parameters caused by simulated fatigue cracks is determined analytically. Preliminary results indicate that the sensitivity of the experimental modal analysis techniques is too low to detect initial and possibly well visible fatigue cracks for steel bridge members, and changes in frequencies are insensitive to the relative location of multiple fatigue cracks.
Subject Headings: Bridge tests | Fatigue (material) | Steel bridges | Highway bridges | Cracking | Modal analysis | Parameters (statistics) | Physical properties
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