Abstract: After summaring the existing abutment displacement computation theory，the model of the bridge abutment sliding displacement，rotation displacement and the mixture of sliding and rotation displacement in earthquake was established based on Newmark，Zeng and Steedman rotational slider block theory; a compuation method of platform displacement was proposed． The change trend of displacement index，sliding displacement and the percentage of displacement under different seismic in ten sity was analyzed． Performance of the abutment was measured through quantizaiton which could provide new feasible ideas for seismic performance of abutment design in meizosesmal areas．

Key words: bridge engineering, abutment, earthquake, sliding displacement, seismic performance

摘要： 在充分总结已有的桥台位移计算理论的基础上，以Newmark滑块及Zeng和Steedman转动块理论为基础，分 别建立了地震下桥台滑移位移、转动位移以及滑移与转动相互耦合位移的计算模型，提出了台体位移的计算方法。 最后根据此计算方法分别分析了位移指数、滑移位移及位移分量百分比等指标在不同地震烈度下的变化趋势，以 量化方式衡量了桥台的抗震性能。为研究强震区桥台抗震提供了新的可行性思路。

关键词: 桥梁工程, 桥台, 地震, 滑移变位, 抗震性能