Strain Transfer Analysis of a Clamped Fiber Bragg Grating Sensor

Sun, Li; Li, Chuang; Li, Jun; Zhang, Chunwei; Ding, Xiaosu

doi:10.3390/app7020188

Cited by 28 publications

(18 citation statements)

References 14 publications

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“…In addition, Refs. [22] deduces the strain transfer equation based on the symmetric structure, which is different from the asymmetric structure of Refs. [21] and Eq.…”

Section: Parametric Analysismentioning

confidence: 99%

“…According to the principle of equivalent deformation, "Wu et al [21] deduced the strain transfer function of the grating ends packaged structure", in which only the Young's modulus of the adhesive layer and the grating length were taken into account. "Sun et al [22] proposed the strain transfer model for a clamped FBG sensor" based on symmetry.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strain transfer mechanism of grating ends fiber Bragg grating for structural health monitoring

Chen¹,

Ding²,

Feng³

et al. 2019

Structural Durability &Amp; Health Monitoring

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The grating ends bonding fiber Bragg grating (FBG) sensor has been widely used in sensor packages such as substrate type and clamp type for health monitoring of large structures. However, owing to the shear deformation of the adhesive layer of FBG, the strain measured by FBG is often different from the strain of actual matrix, which causes strain measurement errors. This investigation aims at improving the measurement accuracy of strain for the grating ends surface-bonded FBG. To fulfill this objective, a strain transfer equation of the grating ends bonding FBG is derived, and a theoretical model of the average strain transfer from the matrix to the optical fiber is developed. Moreover, parameters that influence the average strain transfer rate from the matrix to the optical fiber are analyzed. A selection scheme of bonding parameters by numerical simulation is provided, which is significantly advantageous over that of the grating bonding FBG. The theoretical equation is verified by finite element method (FEM). Compared with the existing model, the proposed model has higher measurement accuracy. Experimental tests are performed to validate the effectiveness of the proposed model on the equalintensity cantilever beam, whose surface is attached to the bare FBG with grating ends bonding and strain gauge by using epoxy glue. The results show that there is a great agreement between the outcome of the bare FBG and that of the strain gauge, and the corrected strain is closer to the true strain. The proposed model provides a theoretical basis for the design of the grating ends surface-bonded FBG strain sensor for health monitoring of large structures.

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“…In addition, Refs. [22] deduces the strain transfer equation based on the symmetric structure, which is different from the asymmetric structure of Refs. [21] and Eq.…”

Section: Parametric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain transfer mechanism of grating ends fiber Bragg grating for structural health monitoring

Chen¹,

Ding²,

Feng³

et al. 2019

Structural Durability &Amp; Health Monitoring

View full text Add to dashboard Cite

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“…Numerous researchers have conducted research on FBG strain sensors and its applications in the field of health monitoring in various civil structures. [48][49][50][51][52][53][54][55][56][57][58][59] Considering the applications of FBG sensors in building structures, it should be noted that only few researchers have explored the use of FBG sensors to date. In this regard, one of the prominent research over the use of FBG sensors in building structures to monitor the wind response is made by Ni et al 60 where the use of massive deployment of FBG sensors in Canton tower, China, for temperature and strain monitoring has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Fibre Bragg grating sensor-based damage response monitoring of an asymmetric reinforced concrete shear wall structure subjected to progressive seismic loads

Zhang

Alam

Sun

et al. 2018

Struct Control Health Monit

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Summary This research explores the seismic damage response of a frame–shear wall reinforced concrete structure exposed to progressive seismic excitations. The shear wall structure is a three‐storey one‐quarter‐scaled reinforced concrete structure. The test was conducted by applying progressive seismic excitations using a shaking table. The shear wall structure experienced inelastic deformations under high seismic excitations that eventually caused the transformation of the structure from a state of elastic deformation to a state of highly inelastic deformation. Damage in the form of plastic hinges occurred because of induced dynamic instability in the structure. The monitored seismic responses in this research includes the variation in the residual strains and their dynamic time histories. Precise and detailed measurements of varying strain responses and effective estimation of damage response within the structure have been a primary goal in this research. Successful implementation of fibre Bragg grating (FBG) strain sensor is presented and applied in this experiment because of its enhanced sensitivity towards monitoring the structural dynamic strain response. The presented research also evaluates the suitability of FBG strain sensors in dynamic testing of a frame–shear wall asymmetric structure by comparing the damage response obtained through FBG sensors and the predictions developed from the dynamic properties of the test structure, monitoring the progress in structural damage and predicting the cracks inside the structure. The monitored responses obtained through a series of tests prove that FBG sensors have the advantages of significant accuracy, small size, and good embedding abilities. It demonstrates its promising failure monitoring abilities and potentials for the crack detection. The results achieved through this research would be beneficial to validate existing numerical simulation and analytical procedures, particularly for the structures with inherent asymmetry. It has been demonstrated in this paper that (a) the structure entered into the critical state when the ground motion excitation was 0.5 g with invisible cracks, (b) a sudden change in the residual strain response can help in detecting the initiation of a crack, and (c) the damages in the structure were due to the formation of the plastic hinges at the flexible edge of the structure near the beam–column joints.

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“…Popular terms such as Internet of Things and smart structures were coined as a result of the intersection between advances in other engineering disciplines with civil engineering to produce the new field of structural health monitoring (SHM). The field of SHM is now at a vital crossroads, where researchers are challenged to develop technologies for the monitoring and retrofit of older buildings and at the same time to push the boundaries of SHM through the creative use of cutting-edge technologies and data processing algorithms.This issue is a snapshot of the newest research in SHM for civil structures, and it includes a range of topics such as data processing algorithms to detect damage, modeling, and simulation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]; sensor development and experiments [16][17][18][19][20][21][22][23][24][25][26]; materials studies [27,28]; state-of-the-art reviews [29,30]; and case studies [31]. SHM is highly multi-disciplinary, and advances in other areas of study can likely be recruited for the progress of SHM.…”

mentioning

confidence: 99%

Structural Health Monitoring (SHM) of Civil Structures

2017

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As newer and more reliable ways of construction were developed, civilization began to spread out further and retain functional infrastructure for longer periods of time. Key building materials such as concrete ushered in a new era of civil engineering that enabled the rapid and low-cost construction of infrastructure that now serves as the backbone of modern society. Many of such buildings constructed in the 19th to the mid-20th century are still in operation today as a testament to the robustness of the civil structures enabled by the key building materials and methods. However, robustness has its limits, and the extended service life has inevitably led to the dangerous accumulation of damage in the infrastructure. Aging infrastructure is a problem met around the globe, and in the US, the National Academy of Engineering proclaimed the restoration and improvement of urban infrastructure to be one of the Grand Challenges of the 21st century.For the answer to the challenge of aging infrastructure, we look towards the development of advanced sensor and actuator technologies that hold the promise of heralding the next stage of evolution in civil infrastructure. Popular terms such as Internet of Things and smart structures were coined as a result of the intersection between advances in other engineering disciplines with civil engineering to produce the new field of structural health monitoring (SHM). The field of SHM is now at a vital crossroads, where researchers are challenged to develop technologies for the monitoring and retrofit of older buildings and at the same time to push the boundaries of SHM through the creative use of cutting-edge technologies and data processing algorithms.This issue is a snapshot of the newest research in SHM for civil structures, and it includes a range of topics such as data processing algorithms to detect damage, modeling, and simulation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]; sensor development and experiments [16][17][18][19][20][21][22][23][24][25][26]; materials studies [27,28]; state-of-the-art reviews [29,30]; and case studies [31]. SHM is highly multi-disciplinary, and advances in other areas of study can likely be recruited for the progress of SHM. The future of this field is very bright, and will be a driver for the coming futuristic, intelligent infrastructure.

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Strain Transfer Analysis of a Clamped Fiber Bragg Grating Sensor

Cited by 28 publications

References 14 publications

Strain transfer mechanism of grating ends fiber Bragg grating for structural health monitoring

Strain transfer mechanism of grating ends fiber Bragg grating for structural health monitoring

Fibre Bragg grating sensor-based damage response monitoring of an asymmetric reinforced concrete shear wall structure subjected to progressive seismic loads

Structural Health Monitoring (SHM) of Civil Structures

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