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| Research on the Mechanism of Longitudinal Seismic Mitigation Devices for High-speed Railway Continuous Bridges |
| LI Xiao-bo |
| (China Railway Design Corporation, Tianjin 300142, China) |
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Abstract Abstract：Research purposes： In order to provide the basis for the longitudinal seismic mitigation design of long- span continuous bridges, based on a (60+100+100+60)m long-span continuous bridge, the seismic mitigation mechanism and effect of Lock-up device, fluid viscous damper and double spherical seismic bearing were studied comparatively in this paper, the main parameters that affect the seismic mitigation effect were analyzed, and then the reasonable parameter range and the applicable condition of seismic mitigation devices were discussed. Research conclusions：（1）The lock-up device do not dissipate seismic energy, and it reduces the response of the fixed pier by changing the seismic force distribution path. But it will reduce the longitudinal vibration period of structure, leading to the increase of the internal force response of the structure, so the seismic mitigation effect for short pier is better.（2）Fluid viscous damper do not change the dynamic characteristic of the bridge structure, which mainly reduces the seismic response by hysteretic energy. (3) Double spherical seismic bearing lengthens the longitudinal natural vibration period, and it provides additional damping for structure by hysteretic energy, which obviously reduces the internal force of the fixed pier but increases the relative displacements between girder and pier. (4) The research results can provide reference for the longitudinal seismic mitigation design of long-span continuous bridge.
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Received: 15 November 2017
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2017, Vol. 34 
