Distributed Optical Fiber-Based Approach for Soil–Structure Interaction

Boujia, Nissrine; Schmidt, Frank; Chevalier, Christophe; Siegert, Dominique; Bang, Damien Pham Van

doi:10.3390/s20010321

Cited by 9 publications

(9 citation statements)

References 21 publications

(26 reference statements)

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“…Section are verified. Moreover, experimental results from literature agree with this conjecture [5,6]. The following investigations are aimed to capture the analytical value of this constant.…”

Section: Equivalent Cantilevered Beam Of a Partially Embedded Euler-bernoulli Beam In A Pasternak Soilsupporting

confidence: 58%

“…It has been shown experimentally [6] that when the nonburied length of the beam is varying, the first natural frequency of the partially embedded beam has a similar variation as the one of a cantilevered beam with same parameters ( E, I, , A ). This observation is also confirmed by the model that has been developed previously.…”

Section: Equivalent Cantilevered Beam Of a Partially Embedded Euler-bernoulli Beam In A Pasternak Soilmentioning

confidence: 99%

“…[5] proposed a new type of low-cost rod-sensor using accelerometers, which were also used for direct monitoring of the response of a pile in [24]. For a given geometry and material of the rod, and type of soil, there is a similarity of eigenfrequency variation with scour depth between the rod that is embedded in soil and a cantilevered beam of a given corresponding length [6]. A new parameter is then defined, named the equivalent free length which is a function of the mechanical and inertial characteristics of the beam and the mechanical characteristic of the soil…”

Section: Introductionmentioning

confidence: 99%

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Scour monitoring of a bridge pier through eigenfrequencies analysis

et al. 2021

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This paper presents an innovative method for scour monitoring, based on the analysis of the dynamic response of a bridge pier embedded in the riverbed. Apart from the mechanical and physical characteristics of the pier itself, soil-structure interaction (SSI) has an impact on the dynamical behaviour of the system. This is particularly the case for eigenfrequencies of the pier which decrease when the free length increases. In this paper, analytical developments are carried out for an Euler–Bernoulli beam, modelling the pier which is embedded in the soil with Winkler springs for SSI. By using Hamilton’s principle and endowing the specific boundary conditions, the system frequencies are assessed by looking for roots of the characteristic equation of the system. These eigenfrequencies are then compared with those of an equivalent cantilevered beam, which can be expressed analytically. Moreover, experiments are carried out to validate the concept of equivalent length as a parameter of the inverse problem, linking the dynamic behaviour of the system and the embedded length.

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Section: Equivalent Cantilevered Beam Of a Partially Embedded Euler-bernoulli Beam In A Pasternak Soilsupporting

confidence: 58%

Section: Equivalent Cantilevered Beam Of a Partially Embedded Euler-bernoulli Beam In A Pasternak Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scour monitoring of a bridge pier through eigenfrequencies analysis

et al. 2021

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“…Liu has accurately located the leakage point in an underground diaphragm wall seepage monitoring through the DFOS [ 22 ]. Boujia successfully adopted the DFOS for soil-structure interaction [ 23 ]. Gao further extended the application to the transformer winding deformation [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Liu

et al. 2020

Sensors

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Traditional monitoring methods cannot obtain the overall thermal information for power transformers. To solve this problem, a distributed fiber optic sensor (DFOS) was creatively applied inside an operating 35 kV power transformer by highly integrating with the electromagnetic wires. Then, the transformer prototype with totally global sensing capability was successfully developed and it was qualified for power grid application through the strict ex-factory tests. The as designed optical fiber sensor works stably all the time with a temperature accuracy of ±0.2 °C and spatial positioning accuracy of 0.8 m. Based on the obtained internal temperature distribution, Gaussian convolution was further applied for the signal processing and hereby, the hotspots for all the windings and iron cores could be accurately traced. The hottest points were located at 89.1% (55 °C) of the high voltage winding height and 89.7% (77.5 °C) of the low voltage winding height. The actual precise hotspot location corrected the traditional cognition on the transformer windings and it would serve as an essential reference for the manufactures. This new nondestructive internal sensing and condition monitoring method also exhibits a promising future for the DFOS applying in the high-voltage electrical apparatus industry.

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“…Depending on the measurement principle, each type of method has its own advantages and limitations under certain environmental conditions. More recently, Boujia et al [ 4 ] combined optical frequency domain reflectometry (OFDR) and the Winkler model to evaluate the effect of scour by performing distributed strain measurements along a rod under static lateral loads. Maroni et al [ 5 ] developed a scour monitoring system consisting of smart probes equipped with electromagnetic sensors for monitoring both scour and deposition process around bridge foundations.…”

Section: Introductionmentioning

confidence: 99%

A New TDR-Based Sensing Cable for Improving Performance of Bridge Scour Monitoring

Wang

Lin

Jheng³

2020

Sensors

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The use of time domain reflectometry (TDR) for real-time monitoring of bridge scour process has gone through several stages of development. The recently-proposed concept of bundled TDR sensing cable, in which two sets of insulated steel strands are twisted around and connected to a central coaxial cable to form a compact sensing cable, is a major change that has several advantages including the bottom-up sensing mechanism. Nevertheless, there is big room for improving its measurement sensitivity and signal to noise ratio (SNR). Changes in waveguide configuration also need to be made to avoid the adverse effect of insulation abrasion observed in field implementation. This study evaluated three new conductor and insulator configurations for constructing the sensing waveguide, including a balanced two-conductor waveguide (Type I), an unbalanced three-conductor waveguide with insulation coating on the middle conductor (Type II) and an unbalanced three-conductor with insulation coating on the two outer conductors (Type III). In all cases, the spacing between the two sets of steel strands (i.e., the waveguide conductors) was especially enlarged by replacing some steel strands with non-conductor wires to increases measurement sensitivity and avoid shorted conditions due to insulation abrasion. Experimental results show that Type III has the best performance on all counts. A new improved TDR sensing cable was hence proposed based on Type III configuration. Its performance was further evaluated by a full-scale experiment to take into consideration the long range of measurement in most field conditions. Detailed discussions on improvements of measurement sensitivity and SNR, limitation of sensing range, and mitigating the adverse effect of insulation abrasion are presented.

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Distributed Optical Fiber-Based Approach for Soil–Structure Interaction

Cited by 9 publications

References 21 publications

Scour monitoring of a bridge pier through eigenfrequencies analysis

Scour monitoring of a bridge pier through eigenfrequencies analysis

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

A New TDR-Based Sensing Cable for Improving Performance of Bridge Scour Monitoring

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