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FBG sensors for seismic control and detection in extradosed bridges

   | Jul 08, 2021

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Figure 1:

Illustration of the functional principle of FBG sensors.
Illustration of the functional principle of FBG sensors.

Figure 2:

Reflective spectrum of FBG sensor.
Reflective spectrum of FBG sensor.

Figure 3:

Strain performance of ICFBG sensor.
Strain performance of ICFBG sensor.

Figure 4:

Temperature performance of ICFBG sensor.
Temperature performance of ICFBG sensor.

Figure 5:

The Beddington Trail Bridge in Canada (Khalil et al., 2016).
The Beddington Trail Bridge in Canada (Khalil et al., 2016).

Figure 6:

Location of Rades-La Goulette Bridge in Tunisia.
Location of Rades-La Goulette Bridge in Tunisia.

Figure 7:

General illustration of the Bridge Rades-La Goulette and their two towers (a) demonstrative model, (b) and (c) realized model.
General illustration of the Bridge Rades-La Goulette and their two towers (a) demonstrative model, (b) and (c) realized model.

Figure 8:

Illustration of towers in (a) marine (http://www.dtrf.setra.fr) and (b) terrestrial environment (http://www.bv.transports.gouv.qc.ca).
Illustration of towers in (a) marine (http://www.dtrf.setra.fr) and (b) terrestrial environment (http://www.bv.transports.gouv.qc.ca).

Figure 9:

Three FBG sensors network multiplexing in a single optical Fiber as SHMS for seismic effects.
Three FBG sensors network multiplexing in a single optical Fiber as SHMS for seismic effects.

Figure 10:

Illustration of the SHMS installed into the tower to measure deflections from the vertical position due to an earthquake.
Illustration of the SHMS installed into the tower to measure deflections from the vertical position due to an earthquake.

Figure 11:

Deviation response at the point where the sensor S1 is installed under seismic effects.
Deviation response at the point where the sensor S1 is installed under seismic effects.

Figure 12:

Deviation response at the point where the sensor S2 is installed under seismic effects.
Deviation response at the point where the sensor S2 is installed under seismic effects.

Figure 13:

Deviation response at the point where the sensor S3 is installed under seismic effects.
Deviation response at the point where the sensor S3 is installed under seismic effects.

Figure 14:

Deflection angle of the tower given by the three points of reference where the sensors S1, S2, and S3 are installed in term of earthquake degree.
Deflection angle of the tower given by the three points of reference where the sensors S1, S2, and S3 are installed in term of earthquake degree.

Figure 15:

Shifts of the wavelengths of the three FBG sensors network constituting the SHMS for seismic effects.
Shifts of the wavelengths of the three FBG sensors network constituting the SHMS for seismic effects.

Figure 16:

The deflection angle of the tower as a function of wavelength shift of the FBG sensors constituting SHMS for seismic effects.
The deflection angle of the tower as a function of wavelength shift of the FBG sensors constituting SHMS for seismic effects.

Examples of bridges that use fiber optic technology, and not the FBG technology, as the basis of SHMS.

Bridges and countryYearSHMSSensors number
Sungsan, South Korea1993Interferometric sensors
Versoix, Switzerland1998Low coherence sensors104
Colle Isarco, Austria/Italy1999Low coherence sensors96
Siggenthal, Switzerland2000Low coherence sensors58
Götaälvbron, Sweden2005Brillouin sensors3

The various sensors installed in the Rades-La Goulette Bridge with these measurement parameters.

SensorLocationTypeMeasured parameterNumber
AnemometerDeckDynamicWind direction1
DeckDynamicWind speed1
Load cellStay cablesDynamicTension of cables12
DisplacementExpansion jointsDynamicMovements of expansion joints6
Low frequency accelerometersDeckDynamicAcceleration of the deck5
InclinometerTowersStaticRotation of the towers4
Vibrating wire strainConcrete deckStaticDeformation of concrete7
TemperatureConcrete deckStaticConcrete temperature14
Stay cablesStaticStay cables temperature2
DeckStaticAir temperature1
Expansion jointsStaticSupport temperature2
Total55

Examples of bridges that use the FBG technology as the basis of its SHMS.

Bridges and countryYearSensors number
Beddington Trail, Canada199320
Taylor, Canada199763
Tsing Ma, China200340
Dongying Yellow River, China20031,800
Luiz I, Portugal2005128
eISSN:
1178-5608
Language:
English
Publication timeframe:
Volume Open
Journal Subjects:
Engineering, Introductions and Overviews, other