Seismic Hybrid Control and its Robustness in Girder Bridges

Two seismic hybrid control methods are studied in this article to mitigate the seismic hazard of girder bridges; one is applied for short-span simply supported, box section girders of concrete bridges using the hybrid mass damper (HMD), the other is applied for long-span girders of concrete bridges to hybridize viscoelastic dampers and actuators. The robustness of the control effect has been paid more attention here. The randomicity of the seismic excitation and the stability of the control algorithm are also taken into account.