中央扣对三塔悬索桥动力特性的影响

基于ANSYS软件建立了泰州长江公路大桥的三维有限元计算模型,并采用子空间迭代法对其进行了自振特性分析,研究了在主跨跨中主缆和主梁之间设置中央扣对大跨度三塔悬索桥动力特性的影响。结果表明：中央扣的设置对第1阶竖弯振型有较大影响,对某些竖弯振型有非常大的影响,而且较明显地推迟了1阶反对称扭转振型的出现,增大了侧弯振动频率;对单跨内反对称侧弯振型的影响大于单跨内正对称侧弯振型,使得以缆索振动为主的振型推迟出现;所得结论为该桥的抗风、抗震研究提供了必要的信息和研究基础。

Influences of Central Buckles on Dynamic Behaviors of Triple-tower Suspension Bridge

A 3-D finite element calculation model was established for Taizhou Yangtze River Bridge based on ANSYS software, and the subspace iteration method was adopted to analyze the natural vibration characteristics of the bridge, meanwhile, the influences of settings of central buckles at the mid-span of the main spans between the main cables and the main girder on the dynamic behaviors of a long span triple-tower suspension bridge were studied. The results show that settings of central buckles have great influence on the first vertical bending vibration mode and have tremendous influence on some other vertical bending modes. Furthermore, central buckles postpone the appearance of the first torsion vibration mode as well as modes mainly consist of main cable vibration. Setting of central buckles increases frequencies of lateral bending vibration modes, and it has greater influence on those vibration modes with an antisymmetric shape in each single span than those with a symmetric shape in each single span. The research results provide a necessary information and research foundation for wind-resistant and anti- seismic research of the bridge.