Structural Health Monitoring Systems - Cowi
Structural Health Monitoring Systems - Cowi
Structural Health Monitoring Systems - Cowi
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9<br />
Event control system<br />
The system will consider as an Event<br />
every signalling of anomaly, breakdown,<br />
accident, unforeseen event,<br />
intrusion, sabotage that generate an<br />
alarm, as well as all planned<br />
activities that influence the Work’s<br />
safety, traffic or durability.<br />
The management of particularly<br />
serious events, such as earthquakes,<br />
calamities, human actions, etc., will<br />
provide the information concerning<br />
the evaluation of consequences and<br />
the planning of intervention,<br />
evacuation, coordination, etc.<br />
In the following some examples on<br />
event control is shown<br />
High Wind Events<br />
Whenever the aerodynamic pressure<br />
on a vehicle is calculated to be<br />
above the acceptable limits for<br />
different classes of vehicles an alarm<br />
will be flashed to the operator on<br />
the SCADA room wall screen and<br />
the Traffic <strong>Monitoring</strong> <strong>Systems</strong><br />
manager’s screen.<br />
Information concerning the actual<br />
aerodynamic pressure can be<br />
computed based upon real time data<br />
collected by the SMS. The aerodynamic<br />
pressure will be calculated<br />
for:<br />
• Aerodynamic pressure on vehicles<br />
and wagons on bridge (for<br />
standard classes of vehicles)<br />
• Aerodynamic pressure on the<br />
bridge deck<br />
• Aerodynamic pressure on the<br />
bridge structure<br />
Weather Alarm<br />
Operational Status Monitor: Meterological <strong>Monitoring</strong><br />
North Road Girder<br />
Wind anemometer<br />
Rain gauge<br />
Water veil<br />
Rail Girder<br />
Air temperature<br />
Surface humidity<br />
South Road Girder<br />
Wind anemometer<br />
Rain gauge<br />
Water veil<br />
Event Management Initiates Automatically<br />
Alarm wind speed > limit<br />
North Road Girder<br />
Wind anemometer<br />
South Road Girder<br />
Wind anemometer<br />
Traffic information Alarm personel Weather forecast<br />
Simulation and prediction monitor: Weather simulation<br />
Windspeed<br />
25 m / s<br />
20 m/<br />
s<br />
15 m/<br />
s<br />
10 m/<br />
s<br />
Measurement<br />
Prediction<br />
Events:<br />
Close bridge<br />
Reduced speed<br />
Close for light vehicles<br />
Warning<br />
Event 1 Event 2 Time<br />
Update: - Bridge servicibility level update based on predictions<br />
- Information to relevant autorities and regional traffic information<br />
- SMS service to frequent bridge users<br />
Weater Status Monitor: Wind Speed Distribution<br />
5,0<br />
Hourly Mean Transverse Wind Speed [m/s]<br />
Minute Gust Transverse Wind Speed [m/s]<br />
6,8<br />
5,1<br />
6,7<br />
8,3<br />
9,5<br />
Wind<br />
6,9<br />
8,3<br />
9,2<br />
11,4<br />
Weather Status Monitor: Wind Rose<br />
5,2<br />
7,2<br />
5,7<br />
7,7<br />
6,2<br />
8,3<br />
5,8<br />
7,9<br />
No event<br />
Warning<br />
Alarm<br />
<strong>Structural</strong> Weather Correlation Monitor:<br />
Wind Induced Sectional Forces<br />
5,2<br />
7,1<br />
9,1<br />
6,8<br />
5,0<br />
5,0<br />
7,9<br />
8,2<br />
6,8<br />
7,0<br />
9,4<br />
11,1<br />
Hourly Wind Speed and Direction at Midspan (Period 1. Aug. 2011 - 21. Feb. 2012, 10:00)<br />
350 0 10<br />
340<br />
20<br />
Wind Evolution During<br />
330<br />
30<br />
Last 7 Hours:<br />
320<br />
40<br />
9:00 to 10:00<br />
310<br />
50<br />
8:00 to 9:00<br />
7:00 to 8:00<br />
300<br />
6<br />
60<br />
6:00 to 7:00<br />
5:00 to 6:00<br />
4:00 to 5:00<br />
290<br />
4<br />
70<br />
3:00 to 4:00<br />
280<br />
2<br />
80<br />
270<br />
260<br />
250<br />
240 8m/s<br />
120<br />
110<br />
90<br />
100<br />
Girder Transverse Bending Moment<br />
Girder Midspan Sectional Forces at Extreem Windeyent<br />
SILS Design Capacity<br />
ULS Design Capacity<br />
SLS2 Design Capacity<br />
SLS1 Design Capacity<br />
SLS1 Wind Speed<br />
SLS2 Wind Speed<br />
ULS Wind Speed<br />
SILS Wind Speed<br />
Aerodynamic<br />
Stability Limit<br />
40 44 47 54 60 75<br />
Hourly Mean Transverse Wind Speed at Midspan<br />
Event on Feb. 3, 2012<br />
(wind speed > 44 m/s)<br />
20:00 - 21:00<br />
19:00 - 20:00<br />
18:00 - 19:00<br />
17:00 - 18:00<br />
16:00 - 17:00<br />
15:00 - 16:00<br />
14:00 - 15:00<br />
230<br />
10m/s<br />
130<br />
220<br />
12m/s 140<br />
210<br />
150<br />
200 160 Bridge Orientation<br />
190 180 170
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