FBG sensors for seismic control and detection in extradosed bridges

Figure 1:

Figure 2:

Figure 3:

Figure 4:

Figure 5:

Figure 6:

Figure 7:

Figure 8:

Figure 9:

Figure 10:

Figure 11:

Figure 12:

Figure 13:

Figure 14:

Figure 15:

Figure 16:

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

Bridges and country	Year	SHMS	Sensors number
Sungsan, South Korea	1993	Interferometric sensors	–
Versoix, Switzerland	1998	Low coherence sensors	104
Colle Isarco, Austria/Italy	1999	Low coherence sensors	96
Siggenthal, Switzerland	2000	Low coherence sensors	58
Götaälvbron, Sweden	2005	Brillouin sensors	3

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

Sensor	Location	Type	Measured parameter	Number
Anemometer	Deck	Dynamic	Wind direction	1
	Deck	Dynamic	Wind speed	1
Load cell	Stay cables	Dynamic	Tension of cables	12
Displacement	Expansion joints	Dynamic	Movements of expansion joints	6
Low frequency accelerometers	Deck	Dynamic	Acceleration of the deck	5
Inclinometer	Towers	Static	Rotation of the towers	4
Vibrating wire strain	Concrete deck	Static	Deformation of concrete	7
Temperature	Concrete deck	Static	Concrete temperature	14
	Stay cables	Static	Stay cables temperature	2
	Deck	Static	Air temperature	1
	Expansion joints	Static	Support temperature	2
Total				55

Examples of bridges that use the FBG technology as the basis of its SHMS_

Bridges and country	Year	Sensors number
Beddington Trail, Canada	1993	20
Taylor, Canada	1997	63
Tsing Ma, China	2003	40
Dongying Yellow River, China	2003	1,800
Luiz I, Portugal	2005	128