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Sensors 2019, 19(1), 200; https://doi.org/10.3390/s19010200

Reinforcement Strains in Reinforced Concrete Tensile Members Recorded by Strain Gauges and FBG Sensors: Experimental and Numerical Analysis

1
Department of Reinforced Concrete Structures and Geotechnics, Vilnius Gediminas Technical University, Sauletekio ave. 11, LT-10223 Vilnius, Lithuania
2
Research Laboratory of Innovative Building Structures, Vilnius Gediminas Technical University, Sauletekio ave. 11, LT-10223 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 21 December 2018 / Accepted: 2 January 2019 / Published: 7 January 2019
(This article belongs to the Section Physical Sensors)
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Abstract

Experimental and numerical studies have been carried out on reinforced concrete (RC) short tensile specimens. Double pull-out tests employed rectangular RC elements of a length determined not to yield any additional primary cracks. Tests were carried out with tensor strain gauges installed within a specially modified reinforcement bar and, alternatively, with fibre Bragg grating based optical sensors. The aim of this paper is to analyse the different experimental setups regarding obtaining more accurate and reliable reinforcement strain distribution data. Furthermore, reinforcement strain profiles obtained numerically using the stress transfer approach and the Model Code 2010 provided bond-slip model were compared against the experimental results. Accurate knowledge of the relation between the concrete and the embedded reinforcement is necessary and lacking to this day for less scattered and reliable prediction of cracking behaviour of RC elements. The presented experimental strain values enable future research on bond interaction. In addition, few double pull-out test results are published when compared to ordinary bond tests of single pull-out tests with embedded reinforcement. The authors summarize the comparison with observations on experimental setups and discuss the findings. View Full-Text
Keywords: Reinforced concrete; tensile elements; strain distribution; fibre Bragg grating; strain gauge; crack spacing Reinforced concrete; tensile elements; strain distribution; fibre Bragg grating; strain gauge; crack spacing
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Kaklauskas, G.; Sokolov, A.; Ramanauskas, R.; Jakubovskis, R. Reinforcement Strains in Reinforced Concrete Tensile Members Recorded by Strain Gauges and FBG Sensors: Experimental and Numerical Analysis. Sensors 2019, 19, 200.

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