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Design and Analysis of a Combined Strain–Vibration–Temperature Sensor with Two Fiber Bragg Gratings and a Trapezoidal Beam
Open AccessArticle

OFBG-Based Smart Double-Skin Tubular Confined-Concrete Column with Basalt FRP-Steel Composite

1
Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China
2
State Key Laboratory of Marine Resource Utilization in South China Sea, College of Civil Engineering and Architecture, Hainan University, Haikou 570228, China
3
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
4
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(16), 3572; https://doi.org/10.3390/s19163572
Received: 3 July 2019 / Revised: 10 August 2019 / Accepted: 13 August 2019 / Published: 16 August 2019
(This article belongs to the Section Optical Sensors)
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Abstract

Fiber-reinforced polymer (FRP) composites have been widely employed to design advanced structural columns such as the hybrid FRP–concrete–steel double-skin tubular column (hybrid DSTC) with potential benefits. To date, the safety and self-monitoring of the hybrid DSTCs are still a challenge to overcome due to the complex damage scenarios. This paper investigates the self-sensing performance of a newly developed smart double-skin tubular confined concrete column (smart BFST-DSTC) made of basalt FRP–steel composite with built-in optical fiber Bragg grating sensors (OFBGs). The design of the smart BFST-DSTC and sensing principle are firstly addressed, followed by an experimental investigation on the basic mechanical properties and strain-based sensing performance of ten scaled specimens under axial compression. The outcomes reveal the enhancement of the proposed column in terms of load-carrying capacity, confinement ratio, and axial stress-axial strain behavior, as well as failure and damage modes when compared with the hybrid DSTC. The self-sensing investigation demonstrates that the measurement range satisfies the requirement to monitor and evaluate the hoop strains of the FRP jackets and the health state of the inner tube. The smart BFST-DSTC can replace the hybrid DSTC with the ability to provide early failure warning and life cycle health monitoring. View Full-Text
Keywords: self-sensing; double-skin tubular column; built-in OFBG; FRP-strengthened steel; punched-in pattern steel; life cycle strain monitoring self-sensing; double-skin tubular column; built-in OFBG; FRP-strengthened steel; punched-in pattern steel; life cycle strain monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Sasy Chan, Y.W.; Zhou, Z.; Liu, W.; Ou, J. OFBG-Based Smart Double-Skin Tubular Confined-Concrete Column with Basalt FRP-Steel Composite. Sensors 2019, 19, 3572.

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