Wind-induced vibration control of bridges using liquid column damper

The potential application of tuned liquid column damper (TLCD) for suppressing wind-induced vibration of longspan bridges is explored in this paper.By installing the TLCD in the bridge deck,a mathematical model for the bridge-TLCDsystem is established.The governing equations of the system are developed by considering all three displacement componentsof the deck in vertical,lateral,and torsional vibrations,in which the interactions between the bridge deck,the TLCD,theaeroelastic forces,and the aerodynamic forces are fully reflected.Both buffeting and flutter analyses are carried out.Thebuffeting analysis is performed through random vibration approach,and a critical flutter condition is identified from flutteranalysis.A numerical example is presented to demonstrate the control effectiveness of the damper and it is shown that theTLCD can be an effective device for suppressing wind-induced vibration of long span bridges,either for reducing the buffetingresponse or increasing the critical flutter wind velocity of the bridge.