Structural Health Monitoring of Cable Supported Bridges · Cable Supported Bridges ... Effects of...
Transcript of Structural Health Monitoring of Cable Supported Bridges · Cable Supported Bridges ... Effects of...
Structural Health Monitoring of Cable Supported Bridges
Heungbae “Harry” Gil
• KOREA EXPRESSWAY CORPORATION
• RESEARCH DIRECTOR
ORGANIZATION OR COMPANY LOGO
Cable supported bridges in Korea
Structural Health Monitoring System(SHMS)
SHMS for bridges in Korea
Findings from long-term SHMS operation
Issues with SHMS
Order of Presentation
CSB in Korea
CSB in Korea
CSB in Korea
CSB in Korea
CSB in Korea
CSB in Korea
CSB in Korea
CSB in Korea
Structural Health Monitoring
Definition
The integration of a sensory system, a data acquisition system,
a data processing and archiving system, a communication
system, structural modeling system that provides information
on demand in real time about any significant change or
damage occurring in the structure on a continuous or periodic
basis
by R. M. Ellis & P.D. Thompson from ISIS Canada &
International Society for Structural Health Monitoring of
Intelligent Infrastructure
Structural Health Monitoring System
Structural Health Monitoring System
Why install SHMS?
Evaluate structural conditions or performances under
operational and environmental conditions
Critical area monitoring(stress, fatigue,..)
Damage detection
Extreme event or abnormal performance
location, time, extent, level of seriousness
Understanding of new structural systems & materials
Structural Health Monitoring System
Sensors
Strain gauges(foil, vibrating wire, FBG)
LVDT, Tiltmeters(Inclinometers)
Accelerometers, Seismometers
Thermometers, Anemometers
Acoustic Monitoring Sensors
GNSS (GPS) Receivers
CCTV
SHMS for Bridges in Korea
Brief HistoryFailure of in-service and under-construction bridges in 1990s
Monitoring system was installed to detect problems with existing bridges from late 1990s
SHMS have been installed on new cable supported bridges from early 2000s
SHMS for Bridges in Korea
SHMS for Bridges in Korea
SHMS for Bridges in Korea
SHMS for Bridges in Korea
Korea Infrastructure Safety Corporation(KISTEK)
SHMS for Bridges in Korea
(Korea Infrastructure Safety Corporation)
Findings from SHMS Operation
Effects of environmental and operational loading on structures Temperature, heavy traffic, wind
Design check Changes in structural systems
Management of extreme events Typhoon, earthquake, fire
Environmental Loading
Temperature effects on the Seohae Bridge
Temperature vs. Thermal movement
(Time lag phenomenon)Temperature change
Environmental Loading
Temperature effects on the Seohae Bridge
Temperature vs. Natural frequencies
Highly linear relationship
Inversely proportional
Environmental Loading
Temperature effects on the Yongjong Bridge
0
50
100
150
200
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400
-20 -10 0 10 20 30 40
E2-중앙E2-외측
신축변위량(mm)
온도(oC)
Displacement of Expansion Joints(mm)
Air Temperature(°C)
-59-43
13
477168
9498
65
37
0
-30-20-28
6
465569
10182
71
39
5-9
-37-25
1540
7074778262
42
16
-24-35
-112
4460
84819070
45
-6
-42
3
6168769798
79
4224
-24-37-27
-147
-112-93
-59
-194
2423
-16-33
-79-102
-118
-91-79
-43-25
-12112
0
-64-87
-105
-132
-104-90
-40-24
519
6 0
-46
-76-98
-136
-101-88
-47
-18
92220
-3
-40
-103-91
-44-40
420
8 0
-45
-70
-124-113-125
24
-29
-58
-117
-102
slop = 0.20
-200
-150
-100
-50
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200
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an
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May
July
Sep
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02-J
an
Mar
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July
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Mar
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July
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Displacement of Expansion Joints(mm)
232~240mm/year
The bridge expands 46mm in every 10oC changewith a correlation coefficient of 0.995
Seasonal Behavior
Environmental Loading
Vortex-shedding (Jindo 2nd Bridge) 2011/4/19
Jindo 2nd
Jindo 1st
Windrose diagram(300 Degree)
Korea Dry Monsoon
(Northwesterly Wind)
• Type : Cable stayed bridge
• Year of completion : 2006. 4
• Length : L=484m(70+344+70)
• Width : B=12.55m
Operational Loading
Traffic loading on Seohae Bridge
-400.000
-350.000
-300.000
-250.000
-200.000
-150.000
-100.000
-50.000
0.000
50.000
100.000
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Def
lect
ion
(m
m)
Measured Deflection of Stiffening Girder (North)
AVG MAX MIN
Operational Loading
Traffic loading on Seohae Bridge
Extreme Events
Typhoon
Extreme Events
Typhoon
Extreme Events
Earthquake
< Ground acceleration records at the Seohae Bridge >
Extreme Events
Cable fire of the Seohae Bridge
Extreme Events
Cable fire of the Seohae Bridge
(72D)
Extreme Events
Cable fire of the Seohae Bridge
(56D)
(57D)
Extreme Events
Cable fire of the Seohae Bridge
Extreme Events
Cable fire of the Seohae Bridge
Extreme Events
Cable fire of the Seohae Bridge
Extreme Events
Cable fire of the Seohae Bridge
Issues with SHMS
Issues with SHMS
Conclusion