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Kishwaukee River Bridge consists of two independent structures: the southbound bridge and
northbound bridge. These two bridges were made by post-tensioning of single-cell precast segments.
The deck of the bridge has five spans. The overall length of the deck is 334 m (1096 ft). The deck was
built by the balanced cantilever method. Each cantilever consisted of seventeen segments 2150 mm
(7'- 3 / 5 ") long and one pier segment 1067 mm (3'-6") long. Cast-in-place closures have a length of 984
mm (3'-2 3 / 4 "). Figure 2 shows the longitudinal layout of the Kishwaukee Southbound Bridge with four
piers. There are four kinds of sensors installed in the Kishwaukee Bridge, as shown in Figure 3:
1) Electrical Resistance Strain Gages; 2) LVDT sensors (Linear Vibration Displacement Transducer);
3) Thermocouples; 4) Accelerometers.
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orth
mtme
nt
n
1-1
Pier SB4
Pier SB3
n
Pier SB2 Jl Soutl
abutn
Pier SB 1
Fig.2 Longitudinal layout of the Kishwaukee Bridge (Units: foot)
North Pier 4
Abutment
'
Pier 3
SMS
Workstation
1
0
Strain gage
•»-
• LVDT 03 gage -
..;...:
J
i«tn
0 Accelerometer
Pier 2
• Thermocouple
,
Fieri
Fig. 3 Sensor Location in Kishwaukee Southbound Bridge (Plain view from top)
u South
Abutment
3 DATA ANALYSIS OF STRUCTURAL MONITORING SYSTEM
Figure 4 shows the flow chart of data analysis of Structural Monitoring System (SMS). As presented in
the chart, the raw data will be divided into four parts according to the fixed channels: 1) Strain; 2)
Crack opening displacement; 3) Acceleration; 4) Temperature. For every part, the real-time data can be