Conceptual Design for Lateral Anti-overturning of Bridges
In this article,clear calculation methods for the bearing uplift and anti-overturning stability coefficients for lateral stability of bridges have been provided.But there are concerns about the calculation of the reaction force of failed bearings as the working conditions are different.The calculation for bearing uplift belongs to the normal usage and should consider all possible effects.The calculation of the anti-overturning stability coefficient assumes that the bearing has already been lifted,and indirect effects on the failed bearing do not produce reaction forces.The reaction forces produced form a balanced force system that does not cause the anti-overturning and stability of the bridge,so there are no indirect effects.Regarding the calculation formulas for stability and instability moments,the overturning axis is implicitly involved.The area formed by the effective bearing connection line and the edge line of the overturning side bridge is the key concept of the anti-overturning design,which can qualitatively determine the most unfavorable lane and the most unfavorable bearing for overturning.For anti-overturning reinforcement of single-column pier bridges,the main solutions include adding new bearings,changing the bearing support to the pier beam,connecting the left and right box beams,adding transverse limit and anti-pull-out devices.Among these,adding new bearings is the most commonly used and effective one.
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