United States Department of Transportation
i
An autonomous structural health monitoring system for Waiau interchange.
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2013-03-01
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By Ma, David T.
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Abstract:Bridge infrastructure is a critical element of the transportation system which makes maintaining its safety and
performance vital to a healthy society. However, the civil infrastructure systems in the United States are decaying
at an accelerated rate due to factors such as aging, drastically increased traffic loads, insufficient funds for
maintenance and management, along with many others. The collapse of the I-35W bridge in Minneapolis,
Minnesota in 2007 has manifested the drawbacks of the maintenance and management efforts currently
implemented. In the State of Hawaii, bridges are currently managed by the Bridge Section of the Hawaii
Department of Transportation using Pontis, an AASHTO bridge and highway management software package.
The data required for this approach is obtained through periodic visual inspections, which have been shown to be
unreliable and subjective. This project develops an automatic structural health monitoring system that collects
and analyzes realtime data so that structural behavior is continuously assessed. The system includes sensing
instruments, a data acquisition subsystem, a power supply unit, a data transmission unit and a remote server for
data processing and storage. The system is deployed on a highway bridge in Honolulu, HI. The detailed design
and installation of the system are included in this report. Typical monitoring results are also presented to
demonstrate the effectiveness of the system.
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