【摘要】 使用ANSYS软件建立设置了非线性粘滞阻尼器大跨径斜拉桥有限元模型，根据规范要求确定长周期地震3个方向分量后输入结构中，计算得到减振效果：设置粘滞阻尼器后跨中纵向位移减少17.09%,塔顶纵向位移减少16.84%,南侧梁端纵向位移减少17.09%,拉索区塔柱中节点纵向位移减少16.73%,跨中轴力减少47.58%,上横梁跨中弯矩减少18.57%,0~#块关键截面最大内力减少了12%左右。计算结果表明相较未采用非线性粘滞阻尼器，在大跨径斜拉桥下横梁纵向设置非线性粘滞阻尼器可有效消减地震输入能量。更多还原

【Abstract】 Using ANSYS software, a finite element model of a long-span cable-stayed bridge was established with nonlinear viscous dampers.Based on code requirements, the three-directional components of long-period ground motions were determined and input into the structural model to evaluate the vibration reduction effectiveness.The results show that the longitudinal displacement at the mid-span is reduced by 17.09%,the longitudinal displacement at the pylon top by 16.84%,the longitudinal displacement at the south girder end by 17.09%,and the longitudinal displacement at the mid-node of the tower column in the stay-cable zone by 16.73%.The mid-span axial force decreased by 47.58%.The mid-span bending moment of the upper crossbeam decreased by 18.57%.The maximum internal forces at critical sections of the 0~# block were reduced by about 12%.The numerical results demonstrate that, compared to bridges without nonlinear viscous dampers, the longitudinal installation of nonlinear viscous dampers on the lower cross beams of long-span cable-stayed bridges significantly mitigates the input seismic energy.更多还原