Intelligent FRP retrofits for critical civil infrastructures

Guoliang Jiang; Kara Peters

doi:10.1117/12.715388

30 March 2007 Intelligent FRP retrofits for critical civil infrastructures

Guoliang Jiang, Kara Peters

Proceedings Volume 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007; 65300X (2007) https://doi.org/10.1117/12.715388
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

In this paper, the concept, modeling and preliminary testing of an intelligent FRP retrofit with self-monitoring capabilities for critical civil infrastructures are presented. This intelligent system is based on an easy-to-apply configuration of FRP pre-preg tapes with multiple stacked unidirectional layers of piezoelectric or SMA actuators and integrated optical fiber sensors. This intelligent retrofit will be able to not only monitor conditions including bonding of the FRP to the structure and opening of concrete cracks, but also minimize the crack opening and retard the progression of further FRP debonding. Towards this end, a computationally efficient two-dimensional shear stress-transfer model based on a simplified shear lag analysis is developed, with consideration of the fact that the stress transfer between the FRP, actuator and sensor layers in the intelligent system is complex. The effectiveness of this model is demonstrated through one numerical benchmark problem and one typical FRP configuration, with comparison of each to full threedimensional finite element models. The agreement between the two formulations is shown to be further improved by adjustment of the assumed shape functions. A preliminary experiment is also presented in which pre-fabricated optical fiber ribbons are embedded into the FRP strengthening of a full-scale concrete beam. Results from static loading test of the FRP strengthened beam show the feasibility of this technique for the self-monitoring FRP retrofits.

Citation Download Citation

Guoliang Jiang and Kara Peters "Intelligent FRP retrofits for critical civil infrastructures", Proc. SPIE 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, 65300X (30 March 2007); https://doi.org/10.1117/12.715388

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KEYWORDS

Fiber reinforced polymers

Sensors

Actuators

Finite element methods

Intelligent sensors

Composites

Fiber optics sensors

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