Abstract
Structural rehabilitation with carbon fiber reinforced composite materials has proven to bean excellent way to enhance/repair steel reinforced concrete structures and prolongtheir service lives. However, disbonds between composite repair patches and hoststructures continue to be a great concern of this technology. In this paper, a built-inpiezoelectric sensor network based structural health monitoring system is introduced formonitoring the disbonds between composite repair patches and the host structures.This diagnostic system combines the sensor network, diagnostic hardware anddata analysis software allowing for real-time monitoring of the integrity of thebonded repair. The effectiveness of detecting disbonds using the system has beendemonstrated on a full scale bridge model in a laboratory setting. The bridge model wasloaded incrementally to failure, and disbond monitoring was carried out during theloading intervals. Test results showed that the system could detect the disbondsbefore they have a noticeable effect on the global stiffness of the bridge model.
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