Abstract
Much of the U.S. civil infrastructure is now operating beyond its design life, but given the cost to replace these resources, we must continue using it as long as it's safe to do so. This condition begs the question, how can we determine the length of time a structure will remain safe to use? One approach that's used is structural health monitoring. SHM measures how a structure is performing under in-service conditions, and then compares the measured performance with some acceptable level of performance. The results can indicate how much service life might remain, and help in making decisions about upgrades to extend the service life of the structure. Extending service life can save money, maintain mobility, and minimize impacts to the community compared to remove and replace options. This article presents a case history where SHM helped extend the useful life of a major highway structure, and suggests ways in which the same approach might be useful for assessing the future performance of geotechnical assets.
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