联塔分幅组合梁斜拉桥抗震性能研究

Study on Seismic Performance of Linked-pylon Framing Composite Beam Cable-stayed Bridge

通过建立空间杆系有限元模型,进行模态分析,得到联塔分幅组合梁斜拉桥的动力特性;采用非线性时程方法研究发现,不同于常规斜拉桥,受双主梁反向纵飘振型影响,联塔分幅斜拉桥桥塔X连接处也是受力控制截面;设置粘滞阻尼器后,塔顶、主梁纵向位移及各关键部位受力可得到显著改善。

The space member finite element model is established to carry out the modal analysis and achieve the dynamic characteristics of the linked-pylon framing composite beam cable-stayed bridge. The nonlinear time-history method is used to find out that the X connection of the linked-pylon framing cable-stayed bridge is also the stress control section by the influence of reverse longitudinal floating mode on double main girders differently from the conventional cable-stayed bridges. The longitudinal displacements of the pylon top and the main girder, and the stress at the key positions can be improved significantly after the viscous dampers are set up.