Abstract: To study the stability of three-span continuous curved girder bridge with single column pier, the overturning axis critical equation of slightly curved bridge and curved bridge is deduced based on the mechanics principle of structure overturning and the selection principle of the bridge overturning axis. The anti-overturning stabilities of curved bridge under two types of overturning axis are compared. The anti-overturning stability coefficient of three-span continuous curved girder bridge with single column pier was checked and compared with the value calculated from standard formula. Calculation results show that, choosing the connecting line of the bearings of two middle piers as the overturning axis, the check is safer. The anti-overturning stability coefficient of the three-span continuous curved girder bridge with single column pier first decreases and then increases with the increase in the curvature radius. For slightly curved bridge, the theoretical calculated value is greater than the value calculated from the standard formula. For curved bridge, both calculated values are basically identical.

Key words: bridge engineering, single column pier, curved girder bridge, anti-overturning stability, radius of curvature, central angle