拱型中央扣对大跨径马鞍面空间索网悬索桥动力模态影响

Influence of Arch Central Buckle on Dynamic Modal of Long-span Suspension Bridge with Saddle-surface Spatial Cable Net

在超大跨径马鞍面混合空间缆索悬索桥基础上,提出一种刚柔并济的提篮拱状钢管混凝土拱型中央扣结构方案,以提高超大跨径悬索桥结构的空间刚度。结合规划中的5000m级琼州海峡大桥,建立ANSYS有限元分析模型,开展提篮拱状钢管混凝土拱型中央扣对马鞍面空间索网悬索桥动力模态特性影响研究。研究表明:提篮拱状钢管混凝土拱型中央扣代替柔性中央扣,提高了超大跨径悬索桥的结构整体性,相比柔性中央扣,提篮拱状钢管混凝土拱型中央扣能够有效提高悬索桥的反对称振型频率。

Based on the super long-span saddle surface hybrid space cable suspension bridge,a scheme of CFST basket-arch central buckle structure combining rigidity and softness was proposed to improve the spatial stiffness of the super long-span suspension bridge structure.Combined with the planned 5000 m Qiongzhou Strait Bridge,the ANSYS finite element analysis model was established,and the influence on the dynamic modal characteristics of saddle surface spatial cable network suspension bridge with the CFST basket-arch central buckle was studied.The research results show that the CFST basket-arch central buckle replaces the flexible central buckle,which improves the structural integrity of the super long-span suspension bridge.Compared with the flexible central buckle,the CFST basket arch central buckle can effectively improve the antisymmetric mode frequency of the super long-span suspension bridge.