【摘要】 以南京小龙湾大桥为研究对象,基于自锚式悬索桥合理成桥状态空间有限元模型,研究结构参数变化对其动力特性的影响,并与相同结构参数的地锚式悬索桥模型进行对比.结果表明:自锚式悬索桥由于塔顶位移约束程度较弱以及主梁承受主缆传来的水平分力,减小了结构体系的刚度,因而比相同结构参数的地锚式悬索桥的振动频率小;恒载、加劲梁竖向刚度和主缆刚度的变化对结构的低阶频率影响较大.研究结果可为类似结构动力特性分析提供参考.更多还原

【Abstract】 Taking Nanjing Xiaolongwan River Bridge as an example,this paper studies the influence of structural parameters on its dynamic characteristics based on the spatial finite element model of reasonable bridge state of self-anchored suspension bridges.This model is then compared with that of earth anchored suspension bridge of the same structural parameters.The results show that the vibration frequency of self-anchored suspension bridge is lower than that of earth anchored suspension bridge,since the stiffness of the structural system is reduced by lesser extent of displacement constraints on the top of the tower and the horizontal component from main cable of the main beam;besides,the low-level frequency of the structure is significantly influenced by dead load,the stiffening girder vertical stiffness and the stiffness of the main cables.The results can be used in similar structure dynamic characteristics analysis.更多还原