Vibration testing of highway bridge structure
Forced and ambient vibration testing has been carried out on a highway bridge in Tamilnadu across Amaravathi river. Forced vibration testing has been carried out in MIMO mode by placing two electrodynamic shakers on the identified span and responses in vertical direction have been measured by eight numbers of accelerometers. Vibration of the bridge span due to vehicular traffic was also acquired. Based on the measurements, it is observed that the bridge has got the natural frequency of 5.28 Hz. Further processing of the results is being carried out to get other system parameters such as modeshapes and damping. The above figure shows the test setup and measurements on the bridge.
