Transverse Seismic Response of the Double-deck Rocking Frame Bridge with Additional Yielding Dampers
To limit earthquake damage and enhance the post-earthquake functional recovery of double-deck bridge frames,this study proposes a yield energy-dissipated double-deck rocking bridge frame based on the rocking concept.A rigid body seismic analysis mod-el of the double-deck rocking bridge frame in the transverse direction was developed using the Lagrange equation and an angular velo-city reduction coefficient to account for energy loss during rocking impacts.The research focuses on a double-deck bridge frame with conventional structural parameters,establishing analysis models for cast-in-place structures,free rocking structures,and yield energy-dissipation rocking structures.Seismic response and parameter analyses were conducted in the transverse direction under far-field,non-pulse near-field,and pulse near-field ground motion excitations.The results indicate that rocking piers can effectively prevent residual deformation of the bridge piers.Additionally,anti-buckling dampers significantly reduce the seismic response and enhance the collapse resistance of the double-deck rocking bridge frame,particularly under near-field earthquake records with pulse excitations.The para-meters of the rocking structure notably influence the seismic response.Increasing the aspect ratio,the size,and the mass ratio of the beam to the rocking column effectively reduces the seismic response of the lower structure,although it may increase the seismic re-sponse of the upper cast-in-place structure to some extent.Importantly,a lower natural frequency of the superstructure may raise the likelihood of plastic deformation in the cast-in-place column.
万方数据
维普
