Paper number 917
|STRENGTHENING AND STRAIN SENSING TECHNIQUES IN RECTANGULAR CONCRETE BEAM USING FIBREGLASS COMPOSITES AND FIBRE BRAGG GRATING SENSORS|
K. T. Lau1, L. M. Zhou1, L. Ye2 and M. Diao3
1Department of Mechanical Engineering
The Hong Kong Polytechnic University, Hung Hom, Kowloon. Hong Kong.
2Department of mechanical and Mechatronic Engineering
University of Sydney, Sydney, Australia.
3Department of Electrical Engineering,
The Harbin Engineering University, Harbin, P. R. China
|Summary||In this paper, a state-of-art report of an experimental investigation on the responses of the laboratory size rectangular concrete beams with the notch formation on the tension side strengthened by using fibre woven composites is presented. Fibre-optic Bragg grating (FBG) sensors have been embedded at the interface between the externally bonded reinforcement and concrete surface to monitor the internal strain behaviour of the beam, which was subjected to three-point bending load after strengthening. The electrical strain gauges were used to measure the surface strain and compare the results from the internal sensors. The results show that the overall flexural strengths of the strengthened specimens are increased compared with its un-strengthened status. Concrete and bonding failures were observed when the thick reinforcement was used. In addition, the results obtained from the sensor reveal that the stress at the notch tip of concrete was higher than that measured on the surface of the reinforcement.
||Keywords|| glass fibre reinforced plastic, fibre-optic Bragg grating sensor, concrete rehabilitation, strain monitoring, novel system.
Theme : Reinforcement and repair in Civil Engineering and Building Construction
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