CONTROL OF TORSIONAL FLUTTER AND BUFFETING OF LONG SPAN BRIDGES USING LIQUID COLUMN DAMPER

摘要

This paper presents a study on wind-induced torsional vibration control of long span bridges by using tuned liquid column damper (TLCD). First, the governing equations for a bridge-TLCD system are derived with considering all the three displacement components of the deck in vertical, lateral, and torsional vibrations. The interactions between the bridge deck, the TLCD, the aeroelastic forces, and the aerodynamic forces are fully reflected in the governing equations. Then, buffeting analysis is carried out through random vibration approach. And then, a critical flutter condition is identified from flutter analysis. Finally, a numerical example is presented to illustrate the effectiveness of the tuned liquid column damper in suppressing wind-induced torsional buffeting response and in increasing critical flutter wind velocity of a long span suspension bridge. It is concluded that the TLCD can be an effective device for wind-induced vibration control of long span bridges.