Study on Semi-active Control of Seismic Bend Torsion Coupling for Curved Bridge

Abstract

Theoretical research and earthquake damage investigation indicate that there is bend torsion coupling vibration for curved bridge when earthquake occurs. To reduce the bend torsion coupling seismic response, the approach of semi-active control of seismic response for curved bridge is presented using piezoelectric friction dampers. The space finite element model for curved bridge is established. Semi-active dampers are set at the bearing positions of bents. The decreasing amplitude effect of semi-active control algorithm is analyzed with different earthquake wave incident angles. The analysis results indicate that the semi-active limit Hrovat control algorithm can reduce seismic responses of the curved bridge effectively, and it is superior to the simple bang-bang control algorithm. The passive control method providing the most damper all the time can increase seismic response of the bridge, and it is unlikely to get better effect by greater damping force in passive control.