Comparison and Analysis of Seismic Measures of Long-span Continuous Railway Girder Bridges

Chaohua Yang

Chongqing Jiaotong University, Chongqing, China

Abstract: The lock up device (LUD) and viscous damper are common dampers, the fuse damper has the functions of LUD and viscous damper due to its unique structure. Constructions of the three devices are dif-ferent, and they also work in different ways. In order to compare the damping effect of three kinds of equip-ment and research numerical simulation methods in Midas Civil. On the basis of Midas model of jiufeng minjiang bridge, the seismic response under the condition of rare earthquake and the damping effect of three kinds of dampers are studied. The time history analysis with ｏｒ without damper was carried out under three rare earthquakes and compare the results of following indexes: The displacement of the top of fixed pier and sliding pier, the relative displacement of pier and beam, the shear force on the top of pier and the bending moment at the bottom of pier under three conditions: no dampers, setting LUD and setting viscous dampers. The results show that both viscous dampers and LUD of the same tonnage have a certain damping effect on continuous girder Bridges, but for seismic response of each pier, the LUD are better than the liquid viscous dampers to a certain degree.

Keywords: Long-span continuous railway bridge; Seismic isolation; Liquid viscous damper; Lock up device