Figure 1:
Elevation view of the structure from upstream
Figure 2:
View of the second span of the bridge (P1–P2) from upstream
Figure 3:
View from A0
Figure 4:
View of the bridge deck cross-section
Figure 5:
Bottom view of the existing bridge deck
Figure 6:
View of the dumper before demolition
Figure 7:
View after deck demolition
Figure 8:
Plan view showing the location of the 22 accelerometers and the demolition area
Figure 9:
Cross-section view of the structure
Figure 10:
Sensor reference and hinge support (on Pier P2)
Figure 11:
View of the accelerometer developed by Cideco
Figure 12:
Flowchart of the acquisition system
Figure 13:
Simplified finite element model diagram
Figure 14:
View of the first bending mode and sensor positions along the span
Figure 15:
Zoom on the model
Table 1:
First two natural frequencies with detailed FEM (Robot), Octave FEM and OMA values, for states S0 , S1 and S2
| State Sk | Natural frequency 1 [Hz] | Natural frequency 2 [Hz] | ||||
|---|---|---|---|---|---|---|
| (Robot) | (Octave) | (OMA) | (Robot) | (Octave) | (OMA) | |
| S0 | 2.50 | 2.49 | - | 3.51 | 3.74 | - |
| S1 | - | 2.44 | 2.45 | - | 3.69 | 3.46 |
| S2 | - | 2.46 | 2.49 | - | 3.72 | 3.71 |
Figure 16:
a) First bending modes, b) second bending modes from Octave , Robot and OMA
Figure 17:
a) First bending modes, b) second bending modes from Octave and OMA ,
Figure 18:
Parameters variation during the model updating from KS0 to KS1
Figure 19:
Parameters variation during the model updating from MS1 to MS2