Long-Term Health Monitoring of the Composite Road Bridge on Delaware Route 896 - 2002 Update.

摘要

This report presents the results of an ongoing investigation into using broadband vibration data to monitor the structural integrity and health of a composite road bridge. The bridge deck configuration is of sandwich construction, as are the Joint Modular Lighter System (JMLS) and the LPD-17 mast, which are currently under development by the U.S. Navy. Demonstrating the ability to determine the structural health and any degradation which causes a change in the stiffness of the Route 896 bridge in its service environment would illustrate the utility of the broadband vibration technique for Navy structures. The primary development being reported here is the ability to determine changes in the structural integrity of the bridge from the first inspection performed in 1999 compared with the state of the structure in 2002. This development will provide guidance for the locations that are showing changes in their structural integrity as the structure ages. This comparison is being performed using the Structural Integrity and Damage Evaluation Routine (SIDER) which is being developed to assist in the health monitoring of large structures.