Fiber optic structural monitoring system of concrete beam retrofitted by composite patches

Ki-Soo Kim; Chul Chung; Hwa-Joog Kim

doi:10.1117/12.483719

14 August 2003 Fiber optic structural monitoring system of concrete beam retrofitted by composite patches

Ki-Soo Kim, Chul Chung, Hwa-Joog Kim

Proceedings Volume 5054, Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies; (2003) https://doi.org/10.1117/12.483719
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

In order to extend the life time of building and civil infra-structure, nowadays, patch type fibrous composite retrofitting materials are widely used. Retrofitted concrete columns and beams gain the stiffness and strength, but they lose toughness and show brittle failure. Usually, the cracks of concrete structures are visible with naked eyes and the status of the structure in the life cycle is estimated with visible inspection. After retrofitting of the structure, crack visibility is blocked by retrofitted composite materials. Therefore, structural monitoring after retrofitting is indispensable and self diagnosis method with optical fiber sensor is very useful. In this paper, we try to detect peel out effect and find the strain difference between main structure and retrofitting patch material when they separate each other. In the experiment, two fiber optic Bragg grating sensors are applied to the main concrete structure and the patching material separately at the same position. The sensors show coincident behaviors at the initial loading, but different behaviors after a certain load.

Citation Download Citation

Ki-Soo Kim, Chul Chung, and Hwa-Joog Kim "Fiber optic structural monitoring system of concrete beam retrofitted by composite patches", Proc. SPIE 5054, Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies, (14 August 2003); https://doi.org/10.1117/12.483719

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