STRUCTURAL HEALTH MONITORING AND SEISMIC IMPACT ASSESSMENT

Civil infrastructure systems deteriorate generally in an uncontrollable speed. Inadequate operation, physical aging, and natural as well as manmade hazards threaten the safety and functionality of these systems. To assess the short-term impact due to hazards (e.g., earthquakes) and the long-term deterioration process due to physical aging and routine operation, continuous condition assessment and performance-based maintenance of civil infrastructure systems are necessary. Structural health monitoring (SHM) has been introduced into the regime of civil engineering as a potential and effective methodology for such an assessment. The fundamental principle of the method is that the existence of damages results in the changes in structural properties, such as mass, damping, and stiffness. These changes will alter both static and dynamic behaviors of structures and thus can be detected by measurements through distributed sensors. Deploying sensing devices (sensors, transducers) onto civil infrastructure systems are driven by rational engineering motivations, such as the potential merit in assuring safety and in saving future cost of maintenance. In this paper, components of SHM systems are reviewed and relationship between modal parameters and structural properties are developed. Relation of structural monitoring to seismic impact assessment is established and an ongoing instrumentation project, as an example, is described. Role of SHM in seismic impact assessment through an integrated, conceptual impact simulator is also discussed.

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