脉冲地震作用下千米级斜拉桥减震设计方法

为研究近断层脉冲地震动作用下千米级斜拉桥的减震设计方法，以某漂浮型千米级斜拉桥为背景，建立了有限元模型，选择了典型的近断层脉冲型地震动，同时设计了3种减震体系，在塔梁之间分别采用弹性连接装置、流体粘滞阻尼器以及两者的组合装置。随后对模型进行了非线性动力分析，分析了脉冲效应、减震体系的设计参数和减震效果，结果表明：脉冲长周期放大结构反应，剪切波速不影响结构反应，组合装置的减震效果最好。最后，建议了基于目标减震率的减震体系设计流程。

Research on seismic-reduction for cable-stayed bridges over kilometers under pulse earthquake action

To study the seismic design method for kilometer-scale cable-stayed bridge under near-fault impulse ground motion, a finite element model was established. The typical near-fault impulse ground motion was selected, and three damping systems were designed. The elastic connection device, the fluid viscous damper and the combination device of the two were used between the towers and beams respectively. Nonlinear dynamic analysis of the model was then carried out, based on which the impulse effect, the design parameters of the damping system and the damping effect were analyzed. The results show that the impulse long-period amplifies the structural response while the shear wave velocity has no effect on the structural response. In addition, the damping effect of the combination device is the best. Finally, the design flow chart for the damping system based on the target damping rate was proposed.