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      Experimental Study on Mechanical and Sensing Properties of Smart Composite Prestressed Tendon

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          Abstract

          It is typically difficult for engineers to detect the tension force of prestressed tendons in concrete structures. In this study, a smart bar is fabricated by embedding a Fiber Bragg Grating (FBG) in conjunction with its communication fiber into a composite bar surrounded by carbon fibers. Subsequently, a smart composite cable is twisted by using six outer steel wires and the smart bar. Given the embedded FBG, the proposed composite cable simultaneously provides two functions, namely withstanding tension force and self-sensing the stress state. It can be potentially used as an alternative to a prestressing reinforcement tendon for prestressed concrete (PC), and thereby provide a solution to detecting the stress state of the prestressing reinforcement tendons during construction and operation. In the study, both the mechanical properties and sensing performance of the proposed composite cable are investigated by experimental studies under different force standing conditions. These conditions are similar to those of ordinary prestressed tendons of a real PC components in service or in a construction stage. The results indicate that the proposed smart composite cable under the action of ultra-high pretension stress exhibits reliable mechanical performance and sensing performance, and can be used as a prestressed tendon in prestressed concrete structures.

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          Most cited references17

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          Fiber Bragg grating technology fundamentals and overview

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            Acoustic emission monitoring of bridges: Review and case studies

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              Vibration-based monitoring of civil infrastructure: challenges and successes

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                25 October 2018
                November 2018
                : 11
                : 11
                : 2087
                Affiliations
                [1 ]Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University, Shanghai 200092, China
                [2 ]Department of Bridge Engineering, Tongji University, Shanghai 200092, China; jiapengfei@ 123456tongji.edu.cn
                [3 ]China Railway Engineering Consulting Group Co., Ltd., Beijing 100055, China; lgqbj@ 123456sohu.com
                [4 ]Zhenshixing Technology Co., Ltd., Tianjin 300384, China; s15122675688@ 123456163.com
                Author notes
                [* ]Correspondence: dandanhui@ 123456tongji.edu.cn ; Tel.: +86-139-1807-5836
                Article
                materials-11-02087
                10.3390/ma11112087
                6265736
                30366385
                50e03d03-ffe5-4f34-ad13-bcc1ec9cc0ec
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 25 September 2018
                : 19 October 2018
                Categories
                Article

                carbon fiber bar,fiber bragg grating,strain sensor,smart composite prestressed tendon,experimental study

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