中文摘要：

研究目的：为探讨大跨度三塔斜拉桥的减震措施，本文以武汉二七长江大桥为实际工程背景，研究桥梁结构体系和附加液体粘滞阻尼器对该桥抗震性能的影响。基于非线性动力时程分析，研究桥梁采用支承体系、漂浮体系、刚构体系下的地震响应；对液体粘滞阻尼器的阻尼系数C和阻尼指数a进行参数敏感性分析。研究结论：（1）3种结构体系下主塔及主梁的内力、变形各有优劣，从结构在地震作用下的整体变形及受力角度上考虑，支承体系是适合于大跨度三塔斜拉桥的结构体系；（2）减震效果对速度指数Ot较为敏感，当O／为0．3—0．5时阻尼器的减震效果较好，综合结构的内力、位移响应，二七长江大桥合理的阻尼器参数为：阻尼系数C为5000kN／（m·s^-1）^a，阻尼指数α／为0．3；（3）本研究成果可为类似大跨度三塔斜拉桥的减震设计提供参考。

英文摘要：

Research purposes： The seismic response of Erqi Yangzi River Bridge in Wuhan, with different girder supporting systems and viscous damper parameters was studied to investigate the anti -seismic measures for long -span three - pylon cable - stayed bridges. A number of nonlinear time - history analyses were conducted focusing on different deck support systems ： simply supporting, floating and rigid system ; Meanwhile, the sensibility of viscous damper＇ s two parameters： damping coefficient C and damping exponent α was researched. Research conclusions ： （ 1 ） Each of the three support systems has its good points on internal force or deformation, but simply supporting system is suitable of long - span three - pylon cable - stayed bridges taking a comprehensive consideration of internal force and deformation. （2） Seismic response is sensible to damping exponent α ranging from 0.3 to 0.5. The appropriate seismic response is gained when the damping parameters are taking as damping coefficient C = 5 000 kN/（ m . s^-1 ）^α, damping exponent α = 0.3. 3 ） The research results can give references for the seismic deign of similar bridges.