Vibration Assessment of a New Danube Bridge at Komárom


Construction of the bridge



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2.1 Construction of the bridge
The bridge was built by using the free cantilever method 
that is most commonly used for cable stayed bridges. 
The construction stage-10 can be seen in Fig. 2 with a can-
tilever length of 209.40 m. Despite the fact, that the TMDs 
were tuned with respect to the dynamic properties of the 
completed bridge, the dampers were already erected and 
activated during the construction stages in order to avoid 
VIV prior to the deck closure.
2.2 Monitoring system on the bridge
Monitoring system on structures are widely used [10] and 
was also utilized considering the slenderness of this unique 
bridge. The dynamic response of the Komárom Bridge as 
well as the wind velocity were monitored simultaneously 
by using sensors during the most critical construction 
period. The sensor positions at the cross section can be 
seen in Fig. 3. The wind velocity U and direction α were 
recorded on both sides of the stiffening girder by using 
sensors type Vaisala WINDCAP Ultrasonic Wind Sensor 
WXT532 mounted onto high steel masts. The accelera-
tion sensors HBM B12 were installed to the cross sections 
at the TMD location. The vertical accelerometers were 
fixed to the top of the moving mass of the TMD (A
TMD
) as 
well as to the bridge deck section (A
bridge
). Thus, the ver-
tical vibration of the bridge deck and the TMD could be 
measured at the same time. As the length of the stiffen-
ing girder changed during the construction, the sensors 
Fig. 2 Free cantilever of the bridge (courtesy of Pont-TERV Ltd.)
Fig. 3 Sensor positioning at the cross section
Fig. 1 Bridge deck with the designer team (courtesy of Pont-TERV Ltd.)


Szabó et al.
Period. Polytech. Civ. Eng.
|3
were repositioned (at one time only) in order to be closer 
to the end of the cantilever. Sampling rate for the wind 
sensors was 1 Hz, while that for the acceleration sensors 
was 20 Hz. The QuantumX MX840B universal measuring 
amplifier, the UPS, the PC for the data collection and the 
GSM communication were placed in a sealed box under-
neath the deck, near the TMD elements.

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