Vibration-based structural health monitoring of highway bridges.
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2008-12-01
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Abstract:In recent years, the condition of aging transportation infrastructure has drawn attention to the maintenance and
inspection of highway bridges. With the increasing importance of life-lines, such as highways, to the national economy
and the well-being of the nation, there is a need to maximize the degree of mobility of the system. This requires not just
routine, or critical event (such as an earthquake) based, inspections, but rather a means of continuous monitoring of a
structure to provide an assessment of changes as a function of time and an early warning of an unsafe condition using
real-time data.
A promising technique, namely Vibration-based Structural Health Monitoring, has been proposed to address this
problem. The basic premise of Vibration-Based Structural Health Monitoring is that changes in structural
characteristics, such as mass, stiffness and damping, will affect the global vibrational response of the structure. In
summary, by studying the changes in measured structural vibration behavior and in essence solving an inverse
problem, the unknown changes of structural properties can be identified.
A new vibration-based structural health monitoring methodology for highway bridges is proposed in this report.
Progress is made in several key areas, including operation modal analysis, damage localization and finite element
model updating. The real-world implementation of a health monitoring system on a highway bridge demonstrates the
effectiveness of the proposed technique and points out directions for future research.
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