目的 研究在辅助墩和桥塔沿纵桥向布置液体黏滞阻尼器的墩、塔阻尼体系对大跨斜拉桥地震响应的影响, 优化同类型大跨斜拉桥的减震体系.方法 选取西固黄河大桥主桥为研究对象, 基于非线性时程分析法对比4种约束体系下大跨度斜拉桥地震响应的特点, 并通过参数分析确定了较为合理的黏滞阻尼器参数.结果 辅助墩处的液体黏滞阻尼器分担部分桥塔阻尼器的阻尼力, 使总阻尼力减小17.8％, 桥塔阻尼器控制结构响应与辅助墩阻尼器控制结构响应基本不耦合;辅助墩与桥塔处液体黏滞阻尼器减震耗能明显, 可以避免墩顶支座在纵桥向发生剪切破坏;综合考虑结构的内力和位移响应, 西固黄河大桥合理阻尼器参数为:桥塔阻尼系数取12 000k N/ (m·s-1) 0.4, 辅助墩阻尼系数取8 000 k N/ (m·s-1) 0.4.结论 墩、塔阻尼体系可以有效控制大跨斜拉桥的地震响应, 相比单独在桥塔处布置液体黏滞阻尼器, 墩、塔阻尼体系改善了桥塔和过渡墩的内力.%In order to study the influence of the pier and tower damping system on the seismic response of the large span cable-stayed bridge with the liquid viscous dampers arranged on the longitudinal bridge, the damping system of the large span cable-stayed bridge was optimized, and Xigu Yellow River Bridge was selected as the research object. Besides, the seismic response of long-span cable-stayed bridge under four kinds of restraint systems was compared based on nonlinear time-history analysis, and the parameters of viscous dampers were determined by parameter analysis. The results showed that the liquid viscous dampers at the auxiliary pier share the damping force of the partial tower damper, reducing the total damping force by 17. 8％, and the structural response of the bridge tower damper control is substantially not coupled to the structural response of the auxiliary damp damper control. The shear failure of the pier top support in the longitudinal bridge can be avoided by the liquid viscous dampers on the auxiliary pier and the bridge tower.The appropriate seismic response is gained when the damping parameters are taking as damping coefficient of bridge tower C = 12 000 k N/ (m·s-1) 0. 4, damping coefficient of auxiliary pier C = 8000 k N/ (m·s-1) 0. 4. The results of the analysis indicate that the damping system of pier and tower can effectively control the seismic response of the long-span cable-stayed bridge. Compared with the liquid viscous dampers arranged at the bridge tower alone, the damping system of pier and tow-er further reduces the internal force of the pylon and the transition pier.
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