Abstract: According to the method that overturning stability coefficients used to verify the lateral stability of bridge in current engineering practice，the selection of overturning axes in the cases of different bearing arrangements and different curvature radius was discussed． Both theoretical analysis and FEM calculation results indicate that both for straight girder bridge and curved bridge with large radius，lateral overturning around the axis through the outboard bearings at the abutments of both ends should be checked． For curved bridge with relatively small radius，whose bearings arranged outside the axis through the outboard bearings，lateral overturning around the axis through two outboard bearings of adjacent spans in the middle of the bridge should be checked．

Key words: girder bridge, lateral stability, overturning axis

摘要： 基于目前工程中采用倾覆稳定系数对梁桥横向稳定进行验算的方法，讨论了不同支座布置形式、不同曲率半 径条件下结构倾覆轴的选取。理论推导和有限元计算结果表明: 联端外侧两支座连线外无支座的直线梁桥和大曲 率半径的曲线梁桥，倾覆轴应选取该连线; 联端外侧两支座连线外有支座的曲线梁桥，倾覆轴应选取跨中位置相邻 两跨外侧支座的连线。

关键词: 梁桥, 横向稳定, 倾覆轴