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无上横梁双直立塔柱形索塔对斜拉桥的整体刚度有较大影响,尤其是索塔的横向刚度大大削弱。该文以主跨320m的预应力混凝土双塔双索面半漂浮体系斜拉桥为研究对象,采用大型有限元软件Ansys建立空间有限元模型,分3种工况(无辅助墩、增设1对辅助墩、增设2对辅助墩)对其进行了静力和动力特性分析。结果表明:设置边跨辅助墩能在一定程度上降低该体系斜拉桥的塔顶水平位移与主梁挠度,对主梁的振动也起到了一定的约束作用,提高了结构的整体刚度,有利于结构的抗震和抗风稳定性。
Undifferentiated beam The double vertical tower pylon has a significant impact on the overall stiffness of the cable-stayed bridge, especially the lateral stiffness of the pylon. In this paper, the main span of 320m prestressed concrete double-tower double-cable semi-floating system cable-stayed bridge is taken as the research object. The finite element software Ansys is used to establish the space finite element model. The model is divided into three working conditions Auxiliary piers, additional two pairs of auxiliary piers) for their static and dynamic characteristics of the analysis. The results show that setting the side-span auxiliary piers can reduce the horizontal displacement of the tower head and the deflection of the main girder of the system cable-stayed bridge to a certain extent, and also restrains the vibration of the main girder and increases the overall stiffness of the structure. Conducive to the structural seismic and wind stability.