Monitoring of FRP Strengthened Concrete Structures Using FBG Sensors

Sundaram, B. Arun; Kesavan, K.; Parivallal, S.; Ahmed, Ali; Ravisankar, K.

doi:10.1016/j.proeng.2011.07.195

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…Meanwhile, to develop a smart CFRP system, Schaller et al [ 18 ] investigated a method of bonding the FBG-OF to the CFRP and conducted four points bending tests on beams and tests on wrapped columns, thereby confirming effective monitoring. Sundaram [ 19 ] installed FBG-OF sensors between concrete and FRP under bending stress and used them to effectively identify the propagation of debonding of FRP. In relation to the NSM (near-surface mounted) FRP reinforcement, Wang [ 20 ] fabricated smart carbon fiber reinforced polymer (Glass FRP) bars with the FBG-OF sensor embedded in the GFRP bars and evaluated the NSM retrofit and strain monitoring effects using the smart GFRP bars on the basis of experimental investigation on the tensile, bond and flexural behaviors of beams.…”

Section: Introductionmentioning

confidence: 99%

Strain Transfer of Fiber Bragg Grating Sensor Externally Bonded to FRP Strip for Structural Monitoring after Reinforcement

et al. 2021

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To date, a method of attaching a FRP (fiber-reinforced polymer) to concrete members with epoxy has been widely applied to increase the strength of the member. However, there are cases in which the adhesion of the epoxy deteriorates over time and the reinforcing effect of the FRP is gradually lost. Therefore, monitoring whether or not the reinforcing effect is properly maintained is needed in order to prevent a decrease in the structural performance of the member improved by FRP reinforcement. In this regard, this study examines FRP with OF (optical fiber) sensors to monitor the reinforcing effect of FRP in concrete structural members. In particular, this paper seeks to determine an appropriate adhesion length when FBG (fiber Bragg grating) based OF sensors are externally bonded to FRP strips with epoxy resin. To this end, a tensile test was carried out to evaluate the sensing performance according to the adhesion length. In addition, an analytical approach was performed and the result were compared with test result. The results of the experimental and analytical studies showed that the strain generated in the FRP is sufficiently transferred to the OF if the total adhesion length of it is 40 mm or more in consideration of the error in the epoxy thickness.

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Section: Introductionmentioning

confidence: 99%

Strain Transfer of Fiber Bragg Grating Sensor Externally Bonded to FRP Strip for Structural Monitoring after Reinforcement

et al. 2021

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“…Sundaram et al utilized fiber Bragg grating (FBG) sensor to monitor the interfacial strains in FRP-repaired concrete elements. The study reported here aims at monitoring the initiation and propagation of debonding failure and also at developing a suitable methodology of measurement for field monitoring of repaired members [37]. Valvona and Toti proposed an innovative seismic retrofitting technique for masonries made by glass-fiber-reinforced cement matrix (GFRCM) grids and textiles with a modern integrated fiber optic sensing system [39].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Zhou

Wang

2018

Journal of Sensors

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The difficulties induced from high-durability package, large-scale measurement, and sensor installation make it a big challenge but an urgent need to predict the mechanical behavior of strengthened reinforced concrete structure with the externally bonded fiber-reinforced polymer (FRP) plate under harsh environments and rough construction process. In an effort to solve this challenge, this paper proposes a novel end anchored self-sensing CFRP plate assembly with built-in optical fiber Bragg grating (FBG) sensor. The self-sensing principle is presented and a demonstration test was carried out in the laboratory in order to investigate the self-sensing properties of the intelligent CFRP plate. Three-point flexural tests of a total of ten RC beams were carried on: six strengthened with the bonded or unbonded posttensioned intelligent CFRP plates, one strengthened with the ordinary CFRP plate, and three strengthened with the control beams. The full-range CFRP plate strain at the maximum moment was measured utilizing the FBG interrogator. Using this monitoring data, the short-term prestress loss attributed to anchorage set and the relationship between the external load and the CFRP strain at the middle span associated with the integral response of the strengthened member were investigated. Besides, the objective of the tests was also to gain a better understanding of the failure mode and the flexural behavior of RC beams strengthened with posttensioned CFRP plates taking into account the different strengthening methods, initial damage, and the dead load before strengthening. The experimental results showed that the developed CFRP plate with built-in FBG sensors not only can be the reinforcement of the RC structures, but also provide an effective way to monitor the full-range behavior of the CFRP plate with the excellent self-sensing property shown in the demonstration tests.

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“…Therefore, many recent studies have been conducted on the use of fibre optical sensors to monitor the behaviour of FRP strengthening systems (e.g. Lau et al, 2001;Sundaram et al, 2011;Wang et al, 2009). Fibre optical sensors are a naturally attractive solution for such applications, as the optical fibres can be easily embedded in the FRP composite during its forming process (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Corvaglia et al, 2010;Li et al, 2011;Wang et al, 2012), and the monitoring of FRPstrengthened RC structures (e.g. Jiang et al, 2010;Kesavan et al, 2013;Lau et al, 2001;Sundaram et al, 2011;Wang et al, 2009Wang et al, , 2012 or all FRP structures (e.g. Amano et al, 2007) using FBG sensors.…”

Section: Introductionmentioning

confidence: 99%

Fibre-reinforced polymer strengthening and fibre Bragg grating–based monitoring of reinforced concrete cantilever slabs with insufficient anchorage length of steel bars

Zhang

2017

Advances in Structural Engineering

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Reinforced concrete cantilever slabs are among structures that are most likely to develop structural integrity problems, as they are statically determinate and often exposed to the outdoor environment. This article presents an experimental study on the strengthening of reinforced concrete cantilever slabs where the anchorage of the top steel reinforcing bars into the adjacent wall was insufficient. The experimental study involved the use of a fibre-reinforced polymer strengthening system and fibre Bragg grating sensors for strain monitoring. The fibre-reinforced polymer strengthening system consisted of glass fibre–reinforced polymer sheets and glass fibre–reinforced polymer spike anchors which connected the glass fibre–reinforced polymer sheets to the adjacent concrete wall. The test results showed that the fibre-reinforced polymer strengthening system was effective in improving the load-carrying capacity of reinforced concrete cantilever slabs and the fibre Bragg grating sensors worked efficiently and reliably for strain monitoring. The debonding in glass fibre–reinforced polymer sheet/glass fibre–reinforced polymer anchor-to-concrete bonded joints was found to be a progressive process associated with an increasing load. The fibre-reinforced polymer strengthening system examined in this study is thus a potential ductile solution for deficient cantilever slabs.

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Monitoring of FRP Strengthened Concrete Structures Using FBG Sensors

Cited by 7 publications

References 3 publications

Strain Transfer of Fiber Bragg Grating Sensor Externally Bonded to FRP Strip for Structural Monitoring after Reinforcement

Strain Transfer of Fiber Bragg Grating Sensor Externally Bonded to FRP Strip for Structural Monitoring after Reinforcement

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Fibre-reinforced polymer strengthening and fibre Bragg grating–based monitoring of reinforced concrete cantilever slabs with insufficient anchorage length of steel bars

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