Strain and deformation monitoring in infrastructure using embedded smart FRP reinforcements

Kalamkarov, Alexander L.; Saha, Gobinda C.; Rokkam, Srujan; Newhook, John; Georgiades, A.V.

doi:10.1016/j.compositesb.2004.12.003

Cited by 19 publications

(7 citation statements)

References 20 publications

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“…In addition, this study showed a procedure for calculating all engineering constants of the transversely isotropic material via tensor components in Eq. (8).…”

Section: Rve Modelmentioning

confidence: 99%

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Assessing Shear-Lag Effect on Pultruded FRP Rods Based on a Numerical Simulation

Vo¹

2021

GEOMATE

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Fiber reinforced polymer rods fabricated from unidirectional fibers and a polymer matrix strengthen effectively reinforced concrete structures, such as the use in near-surface mounted systems. This study focused on aramid fiber reinforced polymer (AFRP) and analytically assessed the shear-lag effect that significantly affects the tensile capacity of the rod. A representative volume element model was employed for predicting the transversely isotropic properties of AFRP rods. In addition, a finite element simulation for the tension test model was performed to assess the shear-lag effect of an AFRP rod with various diameters. The study proposed a procedure for calculating the stress distribution in any cross-section of a fiber reinforced polymer rod. The simulation results agreed well with the previous experimental study. The findings clearly indicated the position of the failure section and the unequal tensile stress distribution in it. The study revealed that the shear-lag effect varied by the rod diameter affects the stress distribution at the failure section and the tensile capacity. The paper shows that the ultimate tensile capacity of any pultruded FRP rod can be predicted by the proposed method.

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“…In addition, this study showed a procedure for calculating all engineering constants of the transversely isotropic material via tensor components in Eq. (8).…”

Section: Rve Modelmentioning

confidence: 99%

“…The shear stiffness plays a key role in the stress transfer. Many researchers also mentioned the shear-lag effect in their studies on the bond performance of FRP rods [8][9][10][11][12]. However, a reasonable procedure for predicting the axial tensile stress distribution in the cross-section has not been proposed yet.…”

Section: Introductionmentioning

confidence: 99%

Assessing Shear-Lag Effect on Pultruded FRP Rods Based on a Numerical Simulation

Vo¹

2021

GEOMATE

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“…These applications include determining propagation of cracks in the concrete medium and debonding damage at the FRP/concrete interface and several more [40,44,54,59,60,64,66,81].…”

Section: Acoustic Emissionmentioning

confidence: 99%

Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

Epp

Cha

2016

Smart Mater. Struct.

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Decline of the state of infrastructure in North America due to aging over the past decades has spawned burgeoning interest in the detection of internal damage of reinforced concrete (RC) structures via nondestructive testing. This study proposes a new impact-echo analysis method using wavelet transforms. The signals recorded from the microphones are analyzed using percentage of energy information to detect in-situ damages. Further, an artificial neural network (ANN) was used in order to test the feasibility of increasing the automaticity of the impact-echo method and a semi-autonomous sensing setup was used to the same end. The proposed wavelet transform-based approach showed improved accuracy when covering broader areas over conventional methods. The use of an ANN removed the need for a user-defined cutoff value for the classification of intact and damaged locations when a least-squared distance approach was used. It is postulated that this may contribute significantly to testing time reduction.

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“…Lv [5] developed a Fiber Bragg grating-based wire-pull bidirectional displacement sensor, and monitored the deformation of foundation pit of Beijing Daxing International Airport in real time. Alexander [6] embedded electrical strain gages to monitor the strain and deflection state of glass fiber-reinforced polymer. In this regard, strain and deformation monitoring has played an important role in health monitoring of civil and industrial structures, especially for strain monitoring of special structures where it is supremely important that early warning signs are established.…”

Section: Introductionmentioning

confidence: 99%

The Strain Transfer Mechanism of Fiber Bragg Grating Sensor for Extra Large Strain Monitoring

Sun

Zhang

et al. 2019

Sensors

113

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This research focuses on a desensitization method to develop a wide-range FBG sensor for extra-large strain monitoring, which is an essential requirement in large scale infrastructures or for some special occasions. Under appropriate hypotheses, the strain transfer distribution of wide-range FBG sensor based on the shear-lag theory is conducted to improve the accuracy of extra-large strain measurements. It is also discussed how the elastic modulus of adhesive layer affects the strain transfer rate. Two prototypes in different monitoring ranges are designed and fabricated by two layers of steel pipe encapsulation. The presented theoretical model is verified by experimental results. Moreover, it is demonstrated that experimentation in regards to the calibration of the wide-range FBG sensor, improved the amplification coefficient up to 2.08 times and 3.88 times, respectively. The static errors are both calculated and analyzed in this experiment. The wide-range FBG strain sensor shows favourable linearity and stability, which is an excellent property of sensors for extra-large strain monitoring.

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Strain and deformation monitoring in infrastructure using embedded smart FRP reinforcements

Cited by 19 publications

References 20 publications

Assessing Shear-Lag Effect on Pultruded FRP Rods Based on a Numerical Simulation

Assessing Shear-Lag Effect on Pultruded FRP Rods Based on a Numerical Simulation

Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

The Strain Transfer Mechanism of Fiber Bragg Grating Sensor for Extra Large Strain Monitoring

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