随着桥梁工程的发展，长周期斜拉桥的抗震问题受到越来越多的关注。采用抗震盆式橡胶支座和粘滞阻尼器的减、隔震技术可以显著地提高桥梁的抗震性能，本文以青州通航孔桥双塔钢箱梁斜拉桥为工程背景，采用大型有限元计算软件MIDAS／civil2010建立基于梁单元的全桥空间有限元模型，探讨大跨度钢箱梁斜拉桥动力特性、抗震性能以及消能减震装置参数优化等方面的问题。阐述了工程背景及主要研究工作，并对桥梁各个部分进行了详细的有限元模拟；然后利用子空间迭代法计算桥梁的自振周期和振型，分析了考虑桩-土作用对动力特性的影响。合理选择粘滞阻尼器可以使结构的位移响应和内力响应同时减小，提高斜拉桥的抗震能力。引入活动盆式支座和阻尼器联合隔震，通过大量的数值计算和理论分析，与固定盆式支座隔震效果对比，检验其可靠性。主要结论如下： （1）以双塔钢箱梁斜拉桥青州大桥为例，利用MIDAS软件建立其空间有限元全桥模型，计算该桥梁动力特性，并对其动力特性进行分析，对工程应用研究具有可行性。 （2）借助有限元软件MIDAS，建立青州大桥模型，运用非线性时程分析结合梁斜拉桥进行地震响应计算分析，分析其减隔震效果，提出较优的减隔震设计方案：活动盆式支座+阻尼器。 （3）活动盆式橡胶支座和粘滞阻尼器混合减隔震系统比单纯的盆式抗震支座隔震效果要好，使得桥塔/墩底部内力得到大幅度的降低，基本处于弹性状态；桥塔/墩顶部位移也得到了控制，保证了桥梁的抗震设计要求。

With the rapid development of bridge engineering，the long-period seismic cable-stayed bridge is paid more and more attention.The seismic performance of bridge can be significantly improved by seismic rubber bearing basin and viscous dampers less isolation technology.Based on the twin towers of steel box girder Qingzhou navigational channel bridge,by use of large-scale finite element calculation software MIDAS/civil2010,full-bridge space finite element model based on beam element is created,the importance of dynamic characteristics of large-span steel box girder,seismic performance and seismic dampers parameter optimization is discussed.The engineering background and research work is expounded,a detailed finite element simulation of various parts of the bridge is carried out;Then the natural period of vibration and mode shapes of the bridge is calculated by use of subspace iteration method,and the influence of pile-soil on dynamic characteristics is analyzed.By choosing viscous dampers reasonably,the displacement response of structure and internal force response can be reduced and the seismic capacity of the cable-stayed bridge can be improved.By the introduction of joint activites pot bearings and damper isolation,through a large number of numerical calculations and theoretical analysis,fixed pot bearings isolation effect is compared,and the reliability is tested. The main research contents are as follows： (1) Based on the twin towers of steer box girder Qingzhou Bridge,by use of the MIDAS software,the spatial finite element model of the full-bridge is established,the dynamic characteristics of the bridge is calculated and its dynamic characteristics is analyzed.The results can provide reference for similar projects. (2) With the help of the finite element software MIDAS,Qingzhou Bridge model is established,seismic response calculation and analysis are carried on by use of FEM analysis combine with girder cable-stayed bridge,the effectiveness of mitigation and isolation is analyzed,optimum design of mitigation and isolation is proposed:Active basin type bearings+damper. (3) The vibration Isolation Effect of Activities basin-type rubber beatings and mixed viscous dampers isolation system is better than the basin seismic bearing,the bridge tower/internal forces at the bottom of the pier is greatly reduced,basically in elastic state;the displacement of the top of the bridge tower/pier is under control,which meets the bridge seismic design requirements.