期刊
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
卷 11, 期 2, 页码 161-171出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921711414233
关键词
fiber-optic sensors; fracture critical bridges; in-service crack detection; structural health monitoring; Brillouin scattering
资金
- National Science Foundation (NSF) under the NEES [CMMI-0936493]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0936493] Funding Source: National Science Foundation
Many bridges worldwide are approaching the end of their lifespan and it is necessary to assess their health condition in order to mitigate risks, prevent disasters, and plan maintenance activities in an optimized manner. Fracture critical bridges are of particular interest since they have only little or no load path redundancy. Structural health monitoring (SHM) has recently emerged as a branch of engineering, which aim is to improve the assessment of structural condition. Distributed optical fiber sensing technology has opened new possibilities in SHM. A distributed deformation sensor (sensing cable) is sensitive at each point of its length to strain changes and cracks. Such a sensor practically monitors a one-dimensional strain field and can be installed over all the length of the monitored structural members, thereby providing with integrity monitoring, i.e. direct detection and characterization (including recognition, localization, and quantification or rating) of local strain changes generated by damage. Integrity monitoring principles are developed and presented in this article. A large scale laboratory test and a real on-site application are briefly presented.
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