中文摘要：

运用有限元软件ANSYS对某斜拉拱桥进行动力和稳定性分析，对比分析了横撑数量、形式及布置部位等因素对结构动力和稳定性能的影响。结果表明，斜拉拱桥的面外刚度低于面内刚度，且其横向稳定问题较普通拱桥更为突出；横撑布置方式对斜拉拱桥面外刚度和扭转刚度影响较大，对面内刚度影响很小；拱顶横撑质量对结构动力和稳定性能的影响较其刚度大，此处不宜采用“米”字撑；增大除拱顶外其他部位横撑刚度对提高结构动力和稳定性能的效果比增加横撑数量更为明显，但一定数量的横撑是保证结构横向刚度的前提，且“K”字撑对动力和稳定性能的影响较“米”字撑显著。

英文摘要：

In this paper, finite element （FE） program ANSYS was used to analyze dynamic performance and stability of a cable-stayed arch bridge. The influence of structural factors, such as the quantity, formation and arrangement of crossbars, on dynamic and stabilization characteristics were compared and analyzed. The results show that the out-of plane stiffness is weaker than the in-plane stiffness, and the issue of lateral instability is more prominent than that of the common arch bridge. The different crossbar arrangements have large influence on the out-of plane stiffness and the torsional stiffness and little influence on the in-plane stiffness. The mass of vault crossbar makes more contribution to the dynamic and stabilization characteristics than its rigidity. Therefore, 米-shaped crossbar should not be adopted in the vault area. The rigidity, rather than the quantity of the crossbar beyond the vault area, was more likely to enhance the dynamic and stabilization characteristics, but the exist of a certain amount of crossbar was the premise to assure structural lateral rigidity, and K-shaped crossbar has more obvious influence on the dynamic and stabilization characteristics than 米-shaped crossbar.